Java Tutor...

FileDumper Class in java

2012-01-13T09:00:00.001-08:00

FileDumper Class in java

import java.io.*; import com.elharo.io.*;  public class FileDumper {    public static final int ASC = 0;   public static final int DEC = 1;   public static final int HEX = 2;    public static void main(String[] args) {      if (args.length < 1) {       System.err.println("Usage: java FileDumper [-ahd] file1 file2...");       return;     }      int firstArg = 0;     int mode = ASC;      if (args[0].startsWith("-")) {       firstArg = 1;       if (args[0].equals("-h")) mode = HEX;       else if (args[0].equals("-d")) mode = DEC;     }      for (int i = firstArg; i < args.length; i++) {       try {         if (mode == ASC) dumpAscii(args[i]);         else if (mode == HEX) dumpHex(args[i]);         else if (mode == DEC) dumpDecimal(args[i]);          }         catch (IOException ex) {         System.err.println("Error reading from " + args[i] + ": "           + ex.getMessage());       }        if (i < args.length-1) {  // more files to dump         System.out.println("\r\n--------------------------------------\r\n");       }     }   }    public static void dumpAscii(String filename) throws IOException {      FileInputStream fin = null;     try {       fin = new FileInputStream(filename);       StreamCopier.copy(fin, System.out);     }     finally {       if (fin != null) fin.close();     }   }    public static void dumpDecimal(String filename) throws IOException {      FileInputStream fin = null;     byte[] buffer = new byte[16];     boolean end = false;      try {       fin = new FileInputStream(filename);       while (!end) {         int bytesRead = 0;         while (bytesRead < buffer.length) {           int r = fin.read(buffer, bytesRead, buffer.length - bytesRead);           if (r == -1) {             end = true;             break;           }           bytesRead += r;         }         for (int i = 0; i < bytesRead; i++) {           int dec = buffer[i];           if (dec < 0) dec = 256 + dec;           if (dec < 10) System.out.print("00" + dec + " ");           else if (dec < 100) System.out.print("0" + dec + " ");           else System.out.print(dec + " ");         }         System.out.println();       }     }     finally {       if (fin != null) fin.close();     }   }    public static void dumpHex(String filename) throws IOException {      FileInputStream fin = null;     byte[] buffer = new byte[24];     boolean end = false;      try {       fin = new FileInputStream(filename);       while (!end) {         int bytesRead = 0;         while (bytesRead < buffer.length) {           int r = fin.read(buffer, bytesRead, buffer.length - bytesRead);           if (r == -1) {             end = true;             break;           }           bytesRead += r;         }         for (int i = 0; i < bytesRead; i++) {           int hex = buffer[i];           if (hex < 0) hex = 256 + hex;           if (hex >= 16) System.out.print(Integer.toHexString(hex) + " ");           else System.out.print("0" + Integer.toHexString(hex) + " ");         }         System.out.println();       }     }     finally {       if (fin != null) fin.close();     }   } }

FileCopier Class in java

2012-01-13T08:59:00.002-08:00

FileCopier Class in java

import java.io.*; import com.elharo.io.*;  public class FileCopier {    public static void main(String[] args) {      if (args.length != 2) {       System.err.println("Usage: java FileCopier infile outfile");     }     try {       copy(args[0], args[1]);     }     catch (IOException ex) {       System.err.println(ex);     }   }    public static void copy(String inFile, String outFile)     throws IOException {      FileInputStream  fin = null;     FileOutputStream fout = null;          try {       fin  = new FileInputStream(inFile);       fout = new FileOutputStream(outFile);       StreamCopier.copy(fin, fout);     }     finally {       try {         if (fin != null) fin.close();       }       catch (IOException ex) {       }       try {         if (fout != null) fout.close();        }       catch (IOException ex) { }     }   } }

FileTyper class in java

2012-01-13T08:59:00.001-08:00

FileTyper class in java

import java.io.*; import com.elharo.io.*;  public class FileTyper {    public static void main(String[] args) throws IOException {     if (args.length != 1) {       System.err.println("Usage: java FileTyper filename");       return;     }     typeFile(args[0]);   }    public static void typeFile(String filename) throws IOException {     FileInputStream fin = new FileInputStream(filename);     try {         StreamCopier.copy(fin, System.out);     }     finally {       fin.close();     }   } }

Program using NullOutputStream Class in java

2012-01-13T08:58:00.001-08:00

Program using NullOutputStream Class in java

package com.elharo.io;

import java.io.*;

public class NullOutputStream extends OutputStream {

private boolean closed = false;

public void write(int b) throws IOException {
if (closed) throw new IOException("Write to closed stream");
}

public void write(byte[] data, int offset, int length)
throws IOException {
if (data == null) throw new NullPointerException("data is null");
if (closed) throw new IOException("Write to closed stream");
}

public void close() {
closed = true;
}
}

Java Program to show AsciiArray class

2012-01-13T08:56:00.000-08:00

Java Program to show AsciiArray class

import java.io.*;

public class AsciiArray {

public static void main(String[] args) {

byte[] b = new byte[(127-31)*2];
int index = 0;
for (int i = 32; i < 127; i++) {
b[index++] = (byte) i;
// Break line after every eight characters.
if (i % 8 == 7) b[index++] = (byte) '\n';
else b[index++] = (byte) '\t';
}
b[index++] = (byte) '\n';
try {
System.out.write(b);
}
catch (IOException ex) {
System.err.println(ex);
}
}
}

StreamCopier class in Java

2012-01-13T08:55:00.000-08:00

StreamCopier class in Java

package com.elharo.io;

import java.io.*;

public class StreamCopier {

public static void main(String[] args) {

try {
copy(System.in, System.out);
}
catch (IOException ex) {
System.err.println(ex);
}

}

public static void copy(InputStream in, OutputStream out)
throws IOException {

byte[] buffer = new byte[1024];
while (true) {
int bytesRead = in.read(buffer);
if (bytesRead == -1) break;
out.write(buffer, 0, bytesRead);
}

}

}

Program for RandomInputStream Class in Java

2012-01-13T08:53:00.000-08:00

Program for RandomInputStream Class in Java

package com.elharo.io;

import java.util.*;
import java.io.*;

public class RandomInputStream extends InputStream {

private Random generator = new Random();
private boolean closed = false;

public int read() throws IOException {
checkOpen();
int result = generator.nextInt() % 256;
if (result < 0) result = -result;
return result;
}

public int read(byte[] data, int offset, int length) throws IOException {
checkOpen();
byte[] temp = new byte[length];
generator.nextBytes(temp);
System.arraycopy(temp, 0, data, offset, length);
return length;

}

public int read(byte[] data) throws IOException {
checkOpen();
generator.nextBytes(data);
return data.length;

}

public long skip(long bytesToSkip) throws IOException {
checkOpen();
// It's all random so skipping has no effect.
return bytesToSkip;
}

public void close() {
this.closed = true;
}

private void checkOpen() throws IOException {
if (closed) throw new IOException("Input stream closed");
}

public int available() {
// Limited only by available memory and the size of an array.
return Integer.MAX_VALUE;
}
}

StreamPrinter Class in Java

2012-01-13T08:51:00.000-08:00

StreamPrinter Class in Java

import java.io.*;

public class StreamPrinter {

public static void main(String[] args) {

try {
while (true) {
int datum = System.in.read();
if (datum == -1) break;
System.out.println(datum);
}
}
catch (IOException ex) {
System.err.println("Couldn't read from System.in!");
}
}
}

Program to Print ASCII values in Java

2012-01-13T08:50:00.000-08:00

Program to Print ASCII values in Java

import java.io.*;

public class AsciiChart
{

public static void main(String[] args) {

for (int i = 32; i < 127; i++) {
System.out.write(i);
// break line after every eight characters.
if (i % 8 == 7) System.out.write('\n');
else System.out.write('\t');
}
System.out.write('\n');
}
}

Creating Threads in Java

2011-05-08T05:38:00.000-07:00

public class ThreadDemo{
public static void main(String args[]){
Thread t1= new Thread();
t1=Thread.currentThread();
System.out.println("Thread Name : "+t1.getName());
System.out.println("Thread Priority : "+t1.getPriority());
System.out.println("Thread is Alive : "+t1.isAlive());
System.out.println("Threa is Daemon : "+t1.isDaemon());
t1.setName("Avinash");
t1.setPriority(9);
System.out.println("Thread Name : "+t1.getName());
System.out.println("Thread Priority : "+t1.getPriority());
try{
for(int i=1;i<=5;i++){
for(int j=1;j<=i;j++){
System.out.print(" "+j);
Thread.sleep(200);
}
System.out.println();
Thread.sleep(1000);
}
}catch(InterruptedException ex){
ex.printStackTrace();
}
}
}

Creating Menu in JAVA with GUI Interface

2011-05-08T05:37:00.002-07:00

Creating Menu in JAVA with GUI Interface

import java.awt.*;
import java.awt.event.*;
public class MenuDemo extends Frame{
private MenuBar mb;
private Menu m1,m2,m3,m4,m5;
private MenuItem ne,op,sa,ss,ps,pr,ex;
private MenuItem un,cp,ct,pa,del,fn,sl;
private MenuItem font,ww;
private MenuItem st,tl;
private MenuItem ht,an;
public MenuDemo(){
mb=new MenuBar();
m1=new Menu("File");
m2=new Menu("Edit");
m3=new Menu("Format");
m4=new Menu("View");
m5=new Menu("Help");
ne=new MenuItem("New");
op=new MenuItem("Open...");
sa=new MenuItem("Save");
ss=new MenuItem("Save As...");
ps=new MenuItem("Page Setup...");
pr=new MenuItem("Print...");
ex=new MenuItem("Exit");
un=new MenuItem("Undo");
cp=new MenuItem("Copy");
ct=new MenuItem("Cut");
ps=new MenuItem("Paste");
del=new MenuItem("Delete");
fn=new MenuItem("Find...");
sl=new MenuItem("Select All");
st=new MenuItem("Status Bar");
tl=new MenuItem("ToolBar");
ht=new MenuItem("Help Topics...");
an=new MenuItem("About NotePad...");

setMenuBar(mb);

mb.add(m1);
mb.add(m2);
mb.add(m3);
mb.add(m4);
mb.add(m5);
setBounds(45,45,500,400);
setLayout(null);
setVisible(true);
}
public static void main(String args[]){
new MenuDemo();
}
}

Creating GUI List in Java Listdemo

2011-05-08T05:37:00.001-07:00

import java.awt.*;
import java.awt.event.*;
public class Listdemo extends Frame
{
List Demo=new List(5,false);
public Listdemo(){
setLayout(null);
setBounds(50,50,400,400);
setVisible(true);
}
public void initcomp()
{
Demo.add("red");
Demo.setBounds(50,50,100,100);
Demo.setVisible(true);
Demo.add("green");
Demo.add("blue");
add(Demo);
Demo.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
String s1=Demo.getSelectedItem();
if(s1=="red"){
setBackground(Color.red);
}
else if(s1=="green"){
setBackground(Color.green);
}
else if(s1=="blue"){
setBackground(Color.blue);
}
}
});
}
public static void main(String args[]){
new Listdemo();
Listdemo l1=new Listdemo();
l1.initcomp();
}
}

Two Listener Example In Java

2011-05-08T05:36:00.001-07:00

import java.awt.*;
import java.awt.event.*;
public class TwoListener implements MouseMotionListener,MouseListener{
private Frame f;
private TextField tf;

public TwoListener(){
f=new Frame("Two Listener Example");
tf=new TextField(30);
}
public void launchFrame(){
Label label=new Label("Click and drag the mouse");
f.add(label,BorderLayout.NORTH);
f.add(tf,BorderLayout.SOUTH);
f.addMouseMotionListener(this);
f.addMouseListener(this);
f.setSize(300,200);
f.setVisible(true);
}
public void mouseDragged(MouseEvent e){
String s="Mouse dragging : X ="+e.getX()+"Y = "+e.getY();
tf.setText(s);
}
public void mouseEntered(MouseEvent e){
String s="The Mouse Entered";
tf.setText(s);
}
public void mouseExited(MouseEvent e){
String s="The mouse has Left the Building";
tf.setText(s);
}
public void mouseMoved(MouseEvent e){
}
public void mousePressed(MouseEvent e){
}
public void mouseClicked(MouseEvent e){
}
public void mouseReleased(MouseEvent e){
}
public static void main(String args[]){
TwoListener two=new TwoListener();
two.launchFrame();
}

}

KeyboardInput Example In Java

2011-05-08T04:15:00.000-07:00

import java.io.*;
public class KeyboardInput{
public static void main(String args[]){
String s;
InputStreamReader ir=new InputStreamReader(System.in);
BufferedReader in =new BufferedReader(ir);
System.out.println("Unix : Type ctrl-d to exit."+"\n Windows :ctrl-z to exit .");
try{
s=in.readLine();
while(s!=null){
System.out.println("Read : "+s);
s=in.readLine();
}
in.close();
}catch(IOException ex){
ex.printStackTrace();
}
}
}

ButtonHandler Example in Java

2011-05-08T04:14:00.001-07:00

import java.awt.event.*;
public class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent ae){
System.out.println("Action Performed");
System.out.println("Button's command is : "+ae.getActionCommand());

}

}

What trivial change can Louis make to his code for smaller that will disable tail recursion in Java?

2011-04-14T09:02:00.000-07:00

1 ]=> (louis-sort test-list <)

;The object (), passed as an argument to safe-car, is not a pair.
;To continue, call RESTART with an option number:
; (RESTART 1) => Return to read-eval-print level 1.

2 error> (debug)

There are more than 50 subproblems on the stack.

Subproblem level: 0 (this is the lowest subproblem level)
Expression (from stack):
   (predicate (car list) ###)
subproblem being executed (marked by ###):
   (cadr list)
Environment created by the procedure: SMALLEST

applied to: ((0) #[arity-dispatched-procedure 39])
The execution history for this subproblem contains 1 reduction.
You are now in the debugger.  Type q to quit, ? for commands.

3 debug> H
H
SL#  Procedure-name          Expression

0    smallest                (predicate (car list) (cadr list))
1    smallest                (if (predicate (car list) (cadr list)) (smalle ...
2    smallest                (let ((answer (if (predicate (car list) (cadr  ...
3    smallest                (let ((answer (if (predicate (car list) (cadr  ...
4    smallest                (let ((answer (if (predicate (car list) (cadr  ...
5    smallest                (let ((answer (if (predicate (car list) (cadr  ...
6    smallest                (let ((answer (if (predicate (car list) (cadr  ...
7    smallest                (let ((answer (if (predicate (car list) (cadr  ...
8    smallest                (let ((answer (if (predicate (car list) (cadr  ...
9    smallest                (let ((answer (if (predicate (car list) (cadr  ...
10   smallest                (let ((answer (if (predicate (car list) (cadr  ...
11   smallest                (let ((answer (if (predicate (car list) (cadr  ...
12   smallest                (let ((answer (if (predicate (car list) (cadr  ...
13   smallest                (let ((answer (if (predicate (car list) (cadr  ...
14   smallest                (let ((answer (if (predicate (car list) (cadr  ...
15   smallest                (let ((answer (if (predicate (car list) (cadr  ...
16   smallest                (let ((answer (if (predicate (car list) (cadr  ...
17   smallest                (let ((answer (if (predicate (car list) (cadr  ...
18   smallest                (let ((answer (if (predicate (car list) (cadr  ...
19   smallest                (let ((answer (if (predicate (car list) (cadr  ...
20   smallest                (let ((answer (if (predicate (car list) (cadr  ...
21   smallest                (let ((answer (if (predicate (car list) (cadr  ...
22   smallest                (let ((answer (if (predicate (car list) (cadr  ...
23   smallest                (let ((answer (if (predicate (car list) (cadr  ...
24   smallest                (let ((answer (if (predicate (car list) (cadr  ...
25   smallest                (let ((answer (if (predicate (car list) (cadr  ...
26   smallest                (let ((answer (if (predicate (car list) (cadr  ...
27   smallest                (let ((answer (if (predicate (car list) (cadr  ...
28   smallest                (let ((answer (if (predicate (car list) (cadr  ...
29   smallest                (let ((answer (if (predicate (car list) (cadr  ...
30   smallest                (let ((answer (if (predicate (car list) (cadr  ...
31   smallest                (let ((answer (if (predicate (car list) (cadr  ...
32   smallest                (let ((answer (if (predicate (car list) (cadr  ...
33   smallest                (let ((answer (if (predicate (car list) (cadr  ...
34   smallest                (let ((answer (if (predicate (car list) (cadr  ...
35   smallest                (let ((answer (if (predicate (car list) (cadr  ...
36   smallest                (let ((answer (if (predicate (car list) (cadr  ...
37   smallest                (let ((answer (if (predicate (car list) (cadr  ...
38   smallest                (let ((answer (if (predicate (car list) (cadr  ...
39   smallest                (let ((answer (if (predicate (car list) (cadr  ...
40   smallest                (let ((answer (if (predicate (car list) (cadr  ...
41   smallest                (let ((answer (if (predicate (car list) (cadr  ...
42   smallest                (let ((answer (if (predicate (car list) (cadr  ...
43   smallest                (let ((answer (if (predicate (car list) (cadr  ...
44   smallest                (let ((answer (if (predicate (car list) (cadr  ...
45   smallest                (let ((answer (if (predicate (car list) (cadr  ...
46   smallest                (let ((answer (if (predicate (car list) (cadr  ...
47   smallest                (let ((answer (if (predicate (car list) (cadr  ...
48   smallest                (let ((answer (if (predicate (car list) (cadr  ...
49   smallest                (let ((answer (if (predicate (car list) (cadr  ...
50   smallest                (let ((answer (if (predicate (car list) (cadr  ...
51   smallest                (let ((answer (if (predicate (car list) (cadr  ...
52   smallest                (let ((answer (if (predicate (car list) (cadr  ...
53   smallest                (let ((answer (if (predicate (car list) (cadr  ...
54   smallest                (let ((answer (if (predicate (car list) (cadr  ...
55   smallest                (let ((answer (if (predicate (car list) (cadr  ...
56   smallest                (let ((answer (if (predicate (car list) (cadr  ...
57   smallest                (let ((answer (if (predicate (car list) (cadr  ...
58   smallest                (let ((answer (if (predicate (car list) (cadr  ...
59   smallest                (let ((answer (if (predicate (car list) (cadr  ...
60   smallest                (let ((answer (if (predicate (car list) (cadr  ...
61   smallest                (let ((answer (if (predicate (car list) (cadr  ...
62   smallest                (let ((answer (if (predicate (car list) (cadr  ...
63   smallest                (let ((answer (if (predicate (car list) (cadr  ...
64   smallest                (let ((answer (if (predicate (car list) (cadr  ...
65   smallest                (let ((answer (if (predicate (car list) (cadr  ...
66   smallest                (let ((answer (if (predicate (car list) (cadr  ...
67   smallest                (let ((answer (if (predicate (car list) (cadr  ...
68   smallest                (let ((answer (if (predicate (car list) (cadr  ...
69   smallest                (let ((answer (if (predicate (car list) (cadr  ...
70   smallest                (let ((answer (if (predicate (car list) (cadr  ...
71   smallest                (let ((answer (if (predicate (car list) (cadr  ...
72   smallest                (let ((answer (if (predicate (car list) (cadr  ...
73   smallest                (let ((answer (if (predicate (car list) (cadr  ...
74   smallest                (let ((answer (if (predicate (car list) (cadr  ...
75   smallest                (let ((answer (if (predicate (car list) (cadr  ...
76   smallest                (let ((answer (if (predicate (car list) (cadr  ...
77   smallest                (let ((answer (if (predicate (car list) (cadr  ...
78   smallest                (let ((answer (if (predicate (car list) (cadr  ...
79   smallest                (let ((answer (if (predicate (car list) (cadr  ...
80   smallest                (let ((answer (if (predicate (car list) (cadr  ...
81   smallest                (let ((answer (if (predicate (car list) (cadr  ...
82   smallest                (let ((answer (if (predicate (car list) (cadr  ...
83   smallest                (let ((answer (if (predicate (car list) (cadr  ...
84   smallest                (let ((answer (if (predicate (car list) (cadr  ...
85   smallest                (let ((answer (if (predicate (car list) (cadr  ...
86   smallest                (let ((answer (if (predicate (car list) (cadr  ...
87   smallest                (let ((answer (if (predicate (car list) (cadr  ...
88   smallest                (let ((answer (if (predicate (car list) (cadr  ...
89   smallest                (let ((answer (if (predicate (car list) (cadr  ...
90   smallest                (let ((answer (if (predicate (car list) (cadr  ...
91   smallest                (let ((answer (if (predicate (car list) (cadr  ...
92   smallest                (let ((answer (if (predicate (car list) (cadr  ...
93   smallest                (let ((answer (if (predicate (car list) (cadr  ...
94   smallest                (let ((answer (if (predicate (car list) (cadr  ...
95   smallest                (let ((answer (if (predicate (car list) (cadr  ...
96   smallest                (let ((answer (if (predicate (car list) (cadr  ...
97   smallest                (let ((answer (if (predicate (car list) (cadr  ...
98   smallest                (let ((answer (if (predicate (car list) (cadr  ...
99   smallest                (let ((answer (if (predicate (car list) (cadr  ...
100  smallest                (let ((answer (if (predicate (car list) (cadr  ...
101  smallest                (let ((answer (if (predicate (car list) (cadr  ...
102  do-loop                 (cons (smallest remainder predicate) (quote ()))
103  do-loop                 (append answer (cons (smallest remainder predi ...
104  do-loop                 (do-loop (cdr remainder) (append answer (cons  ...
105  %repl-eval              (let ((value (hook/repl-eval s-expression envi ...
106  %repl-eval/write        (hook/repl-write (%repl-eval s-expression envi ...
107  do-loop                 (begin (if (queue-empty? queue) (let ((environ ...
108  loop                    (loop (bind-abort-restart cmdl (lambda () (der ...

program that returns 1 if run on a any tail-recursive implementation of a language, but returns 0 if run on a any non tail-recursive implementation of

2011-04-14T09:01:00.000-07:00

program that returns 1 if run on a any tail-recursive implementation of a language, but returns 0 if run on a any non tail-recursive implementation of that same language. The goal is not to find a program and language implementation pair that exhibit the behavior, but to design a program that can correctly infer whether on not any supplied language implementation supports tail recursion by examining its own behavior.

(define (smallest list predicate)
 ;; Returns the smallest element of list.
 (if (null? list)
     #f
     (if (predicate (car list) (cadr list))
         (smallest (cons (car list) (cddr list)) predicate)
         (smallest (cdr list) predicate))))

(define (louis-sort list predicate)
 (do ((remainder list (cdr remainder))
      (answer '() (append answer (cons (smallest remainder predicate) '()))))
     ((null? remainder) answer)))

(define test-list
 (do ((i 0 (+ i 1))
      (answer '() (cons i answer)))
     ((>= i 100) answer)))

program that crashes or doesn't return if run on a any tail-recursive implementation of a language, but returns 0 if run on a any non tail-recursive

2011-04-14T09:00:00.000-07:00

program that crashes or doesn't return if run on a any tail-recursive implementation of a language, but returns 0 if run on a any non tail-recursive implementation of that same language. The goal is not to find a program and language implementation pair that exhibit the behavior, but to design a program that can correctly infer that any supplied implementation does not support tail recursion (this is a weaker condition because we do not require that the program correctly infer support of tail recursion, but only lack of support).

(define (smallest list predicate)
 ;; Returns the smallest element of list.
 (if (null? list)
     #f
     (if (predicate (car list) (cadr list))
         (smallest (cons (car list) (cddr list)) predicate)
         (smallest (cdr list) predicate))))

(define (louis-sort list predicate)
 (do ((remainder list (cdr remainder))
      (answer '() (append answer (cons (smallest remainder predicate) '()))))
     ((null? remainder) answer)))

(define test-list
 (do ((i 0 (+ i 1))
      (answer '() (cons i answer)))
     ((>= i 100) answer)))

Program to show the use of Labeled Break Statement in Java

2011-04-13T06:47:00.000-07:00

publicclass JAVA_034
{

publicstaticvoid main(String[] args)
{
int nValues=50;

System.out.println("The Prime Numbers from 1 to 50 are : ");

OuterLoop:

for(int i=1;i<=nValues;i++)
{
for(int j=2;j
{
if((i%j)==0)
break OuterLoop;
}

System.out.println(i);
}

System.out.println("The rest of the Loop iterations were skipped as 4 is not a Prime Number");
}
}

Program to sort the contents of an array using Bubble Sort in Java

2011-04-12T00:57:00.002-07:00

publicclass JAVA_037
{

publicstaticvoid main(String[] args)
{
int[] array={10,-1,28,13,44,5,36,97,-18,11};

System.out.println(" The contents of the Array in original order are :");

for(int i=0;i
System.out.println("\t\t\t\t\t Array[" + i + "] = " + array[i]);

for(int j=0;j<(array.length-1);j++)
{
for(int k=0;k<(array.length-1);k++)
{
if(array[k]>array[(k+1)])
{
int temp=array[k];

array[k]=array[(k+1)];
array[(k+1)]=temp;
}
}
}

System.out.println("\n The contents of the Array after sorting are :");

for(int l=0;l
System.out.println("\t\t\t\t\t Array[" + l + "] = " + array[l]);
}
}

Program to search an element in an array using Linear Search in Java

2011-04-12T00:57:00.001-07:00

publicclass JAVA_038
{

publicstaticvoid main(String[] args)
{
int[] array={10,-1,28,13,44,5,36,97,-18,11};

System.out.println(" The contents of the Array are :");

for(int i=0;i
System.out.println("\t\t\t\t\t Array[" + i + "] = " + array[i]);

int search_element=44;
int find_index=-1;

for(int j=0;j<(array.length-1);j++)
{
if(array[j]==search_element)
{
find_index=j;

break;
}
}

if(find_index!=-1)
{
System.out.println(" The search element is : " + search_element);
System.out.println(" It is found in the array at position : " + find_index);
}

else
System.out.println("\n The search element is not found in the array.");
}
}

Program to declare, initialize and print an array of characters in Java

2011-04-12T00:56:00.001-07:00

publicclass JAVA_039
{


   publicstaticvoid main(String[] args)
   {
      char[] Vowels={'a','e','i','o','u'};

      System.out.println(" The contents of the Character Array - 2Vowels are :");

      for(int i=0;iout.println("\t\t\t\t\t Vowels[" + i + "] = " + Vowels[i]);
   }
}

Program to declare, initialize and print a 2D array of integers in Java

2011-04-12T00:55:00.000-07:00

publicclass JAVA_040
{

   publicstaticvoid main(String[] args)
   {
      int[][] array={ {10,-1,28,13,44} , {5,36,97,-18,11} };

      System.out.println("The contents of the 2D Array are : \n");

      for(int i=0;iout.println("Dimension # " + (i+1));

         for(int j=0;jout.println("\t Array[" + i + "][" + j + "] = " + array[i][j]);
      }
   }
}

Multi dimensional array declare initialize and display multi dimensional array in Java

2011-04-12T00:54:00.002-07:00

// Declaration of allocating memory to multi dimensional array

int iarr[][] = new int[2][3];

// Initializing elements

iarr[0][0] = 1;

iarr[0][1] = 2;

iarr[0][2] = 3;

iarr[1][0] = 4;

iarr[1][1] = 5;

iarr[1][2] = 6;

//Display array elements

System.out.println(iarr[0][0]);

System.out.println(iarr[0][1]);

System.out.println(iarr[0][2]);

System.out.println(iarr[1][0]);

System.out.println(iarr[1][1]);

System.out.println(iarr[1][2]);

// Or Use for loop to display elements

for (int i = 0; i < iarr.length; i = i + 1)

{

for(int j=0; j < iarr[i].length; j = j + 1)

{

System.out.print(iarr[i][j]);

System.out.print(" ");

}

Program to show an example of using a Static Nested Class in Java

2011-04-12T00:54:00.001-07:00

publicclass JAVA_071
{

  publicstaticvoid main(String[] args)
  {
     System.out.println(new MagicHat("Gray Topper"));
     System.out.println(new MagicHat("Black Topper"));
     System.out.println(new MagicHat("Baseball Topper"));
  }
}

One dimensional array shows how to declare initialize and display an array.

2011-04-12T00:52:00.000-07:00

// Declaration of allocating memory to an array

int iarr[] = new int[3];

// Initializing elements

iarr[0] = 1;

iarr[1] = 2;

iarr[2] = 3;

//Display array elements

System.out.println(iarr[0]);

System.out.println(iarr[1]);

System.out.println(iarr[2]);

// Or Use for loop to display elements

for (int i = 0; i < iarr.length; i = i + 1)

{

System.out.print(iarr[i]);

System.out.print(" ");

}

Corba program of date operations in Java

2011-04-12T00:51:00.000-07:00

module GetDateModule
{
   interface GetDate
   {
       string get_date();
       longlong get_time();
   };

};


// GetDateImpl// Contains the implementation of the methods defined in the IDL file.

import GetDateModule.GetDatePOA;
import java.lang.String;
import java.util.Date;

class GetDateImpl extends GetDatePOA
{
   Date dt=new Date();
      
   GetDateImpl()
   {
       super();
       System.out.println("Encriptor Object Created");
   }

   public String get_date()
   {
       String time=dt.toString();
       return (time);
   }

   publiclong get_time()
   {
       return(dt.getTime());   
   }   
}


// Server


import GetDateModule.GetDate;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import org.omg.PortableServer.*;

class GetDateServer
{

   publicstaticvoid main(String[] args)
   {
       try
       {
           // initialize the ORB
           org.omg.CORBA.ORB orb = org.omg.CORBA.ORB.init(args,null);

           // initialize the BOA/POA
           POA rootPOA = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));
           rootPOA.the_POAManager().activate();

           // creating the GetDate object
           GetDateImpl GetDate = new GetDateImpl();
          
           // get the object reference from the servant class
           org.omg.CORBA.Object ref = rootPOA.servant_to_reference(GetDate);

           System.out.println("Step1");
           GetDate h_ref = GetDateModule.GetDateHelper.narrow(ref);
           System.out.println("Step2");

           org.omg.CORBA.Object objRef =orb.resolve_initial_references("NameService");

           System.out.println("Step3");
           NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
           System.out.println("Step4");

           String name = "GetDate";
           NameComponent path[] = ncRef.to_name(name);
           ncRef.rebind(path,h_ref);

           System.out.println("GetDate Server reading and waiting....");
           orb.run();


       }
       catch(Exception e)
       {
           e.printStackTrace();
       }
   }
}


// Client

import GetDateModule.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import java.io.*;
import java.lang.String;
import java.util.Date;

class GetDateClient
{
  
   publicstaticvoid main(String args[])
   {
       GetDate GetDateImpl=null;
       int i;   
       try
       {
           // initialize the ORB
           org.omg.CORBA.ORB orb = org.omg.CORBA.ORB.init(args,null);

           org.omg.CORBA.Object objRef = orb.resolve_initial_references("NameService");
           NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
          
           String name = "GetDate";
           GetDateImpl = GetDateHelper.narrow(ncRef.resolve_str(name));

           Date dt=new Date();
           long clientTime=dt.getTime();
           System.out.println("Client Date and Time="+dt);

           String serverDate=(String) GetDateImpl.get_date();
          
           long serverTime=(long) GetDateImpl.get_time();
           System.out.println("Server Date and Time="+serverDate);
  
           System.out.println("Time Difference in Server and Client(in millisecond)="+(clientTime-serverTime));
          
       }
       catch(Exception e)
       {
           e.printStackTrace();
       }
   }
}

Character Escape Sequence in Java

2011-01-30T06:30:00.000-08:00

java comes with a solution to that, here the Character Escape Sequence of Java comes to rescue. The escape sequence allows you to embed special characters like double quotes, line feed, carriage return, tab, etc. into the same String. The above example is corrected as follows:-

String str = "Hello, I am Learning \"Java\"";

Now this is the correct way as per Java. What Java sees is that anything after the "\" symbol is to be placed as it is, and is a part of the whole String overall. Though the symbol "\" has different implications with regard to other escape sequences, like "\n" inserts a new line, etc.

The Character escape Sequence in Java is shown below:-

Escape Sequence ------------Purpose
\ddd ------------ Octal character (ddd)
\uxxxx ------------ Hexadecimal UNICODE character (xxxx)
\’ ------------ Single quote
\” ------------ Double quote
\\ ------------ Backslash
\r ------------ Carriage return
\n ------------ New line (also known as line feed)
\f ------------ Form feed
\t ------------ Tab
\b ------------ Backspace

Program to find Prime Number in Java

2011-01-30T06:25:00.000-08:00

import java.io.*;

public class primeNumber
{
public static void main(String[] args)
{
InputStreamReader ir = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(ir);
System.out.println("Enter the number you want to test for prime number:");
int num =0;
int check = 0;
try {
num = Integer.parseInt(br.readLine());
for (int i=2; i < num/2; i++ )
{
if(num%i == 0)
{
check = 0;
break;
}
else
{
check = 1;
}
}
if(check == 1 || num == 2)
{
System.out.println("The number is prime");
}
else
{
System.out.println("The number is not prime");
}
} catch (NumberFormatException e)
{
System.out.println("Kindly enter a proper integer number");

} catch (IOException e)
{
System.out.println("There is some error in the input output handling");
}
}
}

Program in Java code for finding Prime Number

2011-01-30T06:22:00.000-08:00

import java.io.*;

public class primeNumber
{
public static void main(String[] args)
{
InputStreamReader ir = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(ir);
System.out.println("Enter the number you want to test for prime number:");
int num =0;
int check = 0;
try
{
num = Integer.parseInt(br.readLine());
for (int i=2; i <>
if(num%i == 0)
{
check = 0;
break;
}
else
{
check = 1;
}
}
if(check == 1 || num == 2)
{
System.out.println("The number is prime");
}
else
{
System.out.println("The number is not prime");
}
} catch (NumberFormatException e)
{
System.out.println("Kindly enter a proper integer number");

}
catch (IOException e)
{
System.out.println("There is some error in the input output handling");
}
}
}

Java program to find the Factorial of a given number

2011-01-30T06:19:00.002-08:00

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Factorial
{

public static void main(String[] args) throws NumberFormatException, IOException
{
long num;

System.out.println("Enter a number greater then or equal to 0 and less then 40 for which the factorial is desired:-");

InputStreamReader ir = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(ir);
num = Integer.parseInt(br.readLine());

if(num>=0 && num < 40)
{
if(num == 0)
{
num =1;
}
System.out.println(factorial(num));
}
else
{
System.out.println("Number out of range");
}
}
private static long factorial(long num)
{
if(num > 1)
{
num = num * factorial(num-1);
}
else
{
return num;
}
return num;
}
}

Program to find the Area and Circumference of Circle in Java

2011-01-30T06:19:00.001-08:00

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class AreaCircumferenceCircle
{
final static float pi = 22/7f;

public static void main(String[] args) throws NumberFormatException, IOException
{
System.out.println("Enter the radius of the circle: ");
InputStreamReader io= new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(io);
float radius = Float.parseFloat(br.readLine());
System.out.println("Area of the Circle is: "+radius*radius*pi);
System.out.println("Circumference of the Circle is: "+2*radius*pi);
}
}

Program to calculate Area and Perimeter of Rectangle in Java

2011-01-30T05:42:00.000-08:00

import java.io.IOException;

public class AreaPerimeterRectangle
{

public static void main(String[] args) throws NumberFormatException, IOException
{
System.out.println("Enter the length and width of the rectangle: ");
float length = Float.parseFloat(args[0]);
float width = Float.parseFloat(args[1]);
System.out.println("Area of the Rectangle is: "+length*width);
System.out.println("Perimeter of the Rectangle is: "+2*(length+width));
}
}

Sorting array in Ascending order in Java

2011-01-30T05:08:00.000-08:00

import java.util.TreeSet;

public class SortingAscending
{

@SuppressWarnings("unchecked")
public static void main(String[] args)
{
int[] num = {3,5,9,2,1,0,45,23,67,93};
TreeSet ts = new TreeSet();

for(int i = 0; i <>
{
ts.add(num[i]);
}
System.out.println("The numbers of the array set in ascending order are: "+ts);
}
}

Program to find Length of a given String in java

2011-01-30T04:33:00.000-08:00

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class NoOfWordsInString
{

public static void main(String[] args)

throws IOException
{
System.out.println("Enter a string or number for which the number of words is to be counted: ");
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);

String str = br.readLine();

System.out.println("The no of words in the string are: "+str.length());
}
}

Program to Reverse a String in Java

2011-01-30T04:30:00.000-08:00

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ReverseString
{

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException
{
System.out.println("Enter a string to be reversed: ");
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
String str = br.readLine();
StringBuffer sb = new StringBuffer().append(str);
System.out.println("The reversed string is:\n"+sb.reverse().toString());
}

}

Aniket Gadekar

2011-01-19T09:52:00.000-08:00

aniket gadekar, nagpur
Ph : 08878644295, 09970351838
email : aniketgadekar4967@gmail.com

Program to show Continue and break statements in Java

2010-11-19T07:03:00.000-08:00

class ContinueBreak
{
public static void main(String args[])
{
int i,j;
LOOP1:for(i=1;i<=100;i++)
{
System.out.println(" ");
if(i>=10) break;
for(j=1;j<=100;j++);
{
System.out.print(" * ");
if(j==i)
continue LOOP1;
}
}
System.out.println("Termination by BREAK");
}
}

Program to show Common line interface in Java

2010-11-19T07:02:00.000-08:00

class ComLineArgs
{
public static void main(String args[])
{
int count,i=0;
String str;
count=args.length;
System.out.println("number of arguments="+count);
while(i<=count)
{
str=args[i];
i++;
System.out.print(i+: "+"java is"+str);
}
}
}

Program to show class Casting in Java

2010-10-01T10:30:00.001-07:00

class Casting
{
public static void main(String args[])
{
float sum;
int i;
sum=0.0f;
for(i=1;i<=10;i++)
{
sum=sum+1/(float)i;
System.out.print("i="+i);
System.out.println("sum:"+sum);
}
}
}

Creating Application Server in Java

2010-10-01T10:27:00.000-07:00

//import classes
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.Timer;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.awt.*;

//Code for the AppServer class

class MyFrame extends Frame implements ActionListener
{
MyFrame()
{
setSize(600,400);
setVisible(true);

this.setTitle("Welcome to server");
JPanel panel=new JPanel();
//panel.setBackground(new Color(0,100,100));

setLayout(new FlowLayout());
JButton btnReport;
JButton btnExit;
btnReport=new JButton("Report");
panel.add(btnReport);

btnExit=new JButton("Exit");
panel.add(btnExit);
add(panel);

btnReport.addActionListener(this);
btnExit.addActionListener(this);
setVisible(true);//add listener to the Login button

}

public void actionPerformed(ActionEvent ae)
{
String str = ae.getActionCommand();
if(str.equals("Report"))
{
new Reportjen();

}
else if(str.equals("Exit"))
{
System.exit(0);

}

}

}

public class AppServer implements Runnable
{

ServerSocket server;
Socket fromClient;
Thread serverThread;
InetAddress host;

public AppServer()
{
MyFrame obj=new MyFrame();

System.out.println("Conference Engine started...");
try
{
host = InetAddress.getLocalHost();
System.out.println("Host name:'" + host.getHostName()
+ "' has IP address: " + host.getHostAddress());
server = new ServerSocket(1001);
serverThread = new Thread(this);
serverThread.start();
}

catch (UnknownHostException e)
{
e.printStackTrace();
}

catch(Exception e)
{
System.out.println("Cannot start the thread: " + e);
}
}

public static void main(String args[])
{
new AppServer();

}

public void run()
{
try
{
while(true)
{
//Listening to the clients request
fromClient = server.accept();

//Creating the connect object
Connect con = new Connect(fromClient);
}
}
catch(Exception e)
{
System.out.println("Cannot listen to the client" + e);
}
}

}

//Code for the connect class
class Connect
{
ObjectOutputStream streamToClient;
int ctr=0;

BufferedReader streamFromClient;
static Vector vector;
static Vector vctrList;
String message=" ";
static String str=new String("UsrList");

static
{
vector=new Vector(1,1);
vctrList=new Vector(1,1);
vctrList.addElement((String)str);
}

int verify(String mesg)
{

try
{
RandomAccessFile RAS=new RandomAccessFile("UsrPwd.txt", "r");
int i=0;
String str="";
while((RAS.getFilePointer())!=(RAS.length()))
{
str=RAS.readLine();
if(str.equals(mesg))
{
ctr=1;
break;

}
}
RAS.close();
}
catch(Exception e)
{

}

return ctr;

}//end of verify()

int checkFile(String mesg)
{
int chk=1;
try
{
RandomAccessFile RS=new RandomAccessFile("UsrPwd.txt", "r");
int i=0;

String str="";
String colon=new String(":");
int index=((String)mesg).lastIndexOf(colon);

String userName=(String)mesg.substring(0,index);
while((RS.getFilePointer())!=(int)(RS.length()))
{
str=RS.readLine();
int index1=((String)str).lastIndexOf(colon);
String usrName=(String)str.substring(0,index1);
if(usrName.equals(userName))
{
chk=0;
break;

}
}//end of while
RS.close();
}//end of try
catch(Exception e)
{

}

return chk;

}//end of chkFile

public Connect(Socket inFromClient)
{

//Retrieving the clients stream
String msg="",msg1="";
String mesg="";
try
{
streamFromClient = new BufferedReader(new InputStreamReader(inFromClient.getInputStream()));

streamToClient= new ObjectOutputStream(inFromClient.getOutputStream());

msg=streamFromClient.readLine();
//mesg=streamFromClient.readLine();

if((msg.equals("From Timer")))
{
streamToClient.writeObject(vector);
streamToClient.writeObject(vctrList);
}
else if(msg.equals("LoginInfo"))
{ System.out.println(inFromClient.getInetAddress());

msg=streamFromClient.readLine();
int ver=verify(msg);

if(ver==1)
{
msg1=streamFromClient.readLine();

FileOutputStream out = new FileOutputStream("Loginfo.txt",true);
PrintStream p = new PrintStream( out );
p.println();
p.println(msg1);
p.close();

String colon=new String(":");
int index=((String)msg).lastIndexOf(colon);
String userName=(String)msg.substring(0,index) +inFromClient.getInetAddress();
if(!(vctrList.indexOf((String)userName)>0))
{
streamToClient.writeObject("Welcome"+inFromClient.getInetAddress());
vctrList.addElement((String)userName);
}
}
else
{
streamToClient.writeObject("Login denied");
}
}

else if(msg.equals("RegisterInfo"))
{
msg=streamFromClient.readLine();
int ret=checkFile(msg);
if(ret==0)
streamToClient.writeObject("User Exists");
if(ret==1)
{
FileOutputStream out = new FileOutputStream("UsrPwd.txt",true);
PrintStream p = new PrintStream( out );
p.println();
p.println(msg);
p.close();
streamToClient.writeObject("Registered");
}
}
else if(msg.equals("User Logout"))
{
String remUser=streamFromClient.readLine();
boolean b=vctrList.removeElement((String)remUser);
}
else

{

message=message+msg;
vector.addElement((String)message);
streamToClient.writeObject(vector);

}

}//end of try
catch(Exception e)
{
System.out.println("Cannot get the client stream connect" + e);
}

finally
{
try
{
inFromClient.close();
}
catch(IOException e)
{}
}

}//end of connect
}

Program to find area of Rectangle in java

2010-10-01T10:26:00.000-07:00

abstract class Figure
{
double dim1;
double dim2;
Figure(double a, double b)
{
dim1=a;
dim2=b;
}
abstract double area();
}
class Rectangle extends Figure
{
Rectangle(double a, double b)
{
super(a,b);
}
double area()
{
System.out.println("Area of Rectangle");
return(dim1*dim2);
}
}
class Triangle extends Figure
{
Triangle(double a, double b)
{
super(a,b);
}
double area()
{
System.out.println("area of triangle");
return(dim1*dim2/2);
}
}
class AbstractArea
{
public static void main(String args[])
{
Rectangle r=new Rectangle(10,5);
Triangle t=new Triangle(10,2);
Figure figref;
figref=r;
double d1=figref.area();
System.out.println(d1);
figref=t;
double d2=figref.area();
System.out.println(d2);
}
}

Creating circle in java

2010-07-25T08:59:00.000-07:00

interface NewShape
{
//void draw();
}

interface Circle extends NewShape
{
void getRadius();
int radius=10;
}

class NewCircle implements Circle
{
public void getRadius()
{
System.out.println(radius);
}
}
class ExtendInterface extends NewCircle
{
public static void main(String args[])
{
Circle nc=new NewCircle();
nc.getRadius();
}
}

Error handling in java catch throw.

2010-07-25T08:55:00.000-07:00

class Error1
{
public static void main(String args[])
{
int a=10;
int b=5;
int c=5;
int x,y;

try
{
x=a/(b-c);
}
catch(ArithmeticException e)
{
System.out.println("Division by zero");
}
y=a/(b+c);
System.out.println("Result="+y);
}
}

Bank project of simple intrest in java.

2010-07-25T08:51:00.000-07:00

interface account
{
float rate=8.5f;
void set(int accno);
void display();
}

interface person
{
void store(String name, String address);
void show();
}

class Customer implements account, person
{
int accno, numyears;
float bal;
String name="";
String address="";
Customer(float a, int b)
{
bal=a;
numyears=b;
}

public void set(int accno)
{
this.accno=accno;
}
public void display()
{
System.out.println("the account no. and balance is: "+accno+bal);
}

public void store(String name, String address)
{
this.name=name;
this.address=address;
}

public void show()
{
System.out.println("the name and the address is:"+name+" "+address);
}

void interest()
{
float si=bal*numyears*rate/100;
System.out.println("the simple interest is:"+si);
}
}

class Details
{
public static void main(String args[])
{
Customer c1=new Customer(15.0f, 2);
c1.set(100);
c1.store("Popsys","nagpur");
c1.show();
c1.display();
c1.interest();
}
}

File operation in java

2010-07-25T08:45:00.000-07:00

import java.io.*;

class CopyFile
{
public static void main(String args[])
{
FileInputStream A=null;
FileOutputStream B=null;
int b;
try
{
A=new FileInputStream("a.txt");
B = new FileOutputStream("b.txt");
while((b=A.read())!=-1)
{
B.write(b);
}
A.close();
B.close();
System.out.println("File copied successfully");
}
catch(IOException e)
{
System.out.println("file not found");
}
}
}

Creating pyramid of asterisk in java

2010-07-25T08:43:00.000-07:00

class ContinueBreak
{
public static void main(String args[])
{
int i,j;
LOOP1:for(i=1;i<=100;i++)
{
System.out.println(" ");
if(i>=10)
break;
for(j=1;j<=100;j++);
{
System.out.print(" * ");
if(j==i)
continue LOOP1;
}
}
System.out.println("Termination by BREAK");
}
}

While loop in Java

2010-07-25T08:41:00.000-07:00

Creating | drawing circle in Java

2010-07-25T08:38:00.000-07:00

interface NewShape
{
void draw();
}

class NewCircle1 implements NewShape
{
public void draw()
{
System.out.println("new circle 1 is drawn");
}
}

class NewCircle2
{
public void draw()
{
System.out.println("new cirlce 2 is drawn");
}
}

class CastInterface
{
public static void main(String args[])
{
NewShape nc1=new NewCircle1();
NewCircle2 nc2=new NewCircle2();
nc1.draw();
nc2.draw();
}
}

Creating class in Java.

2010-07-25T08:36:00.000-07:00

class A
{
void show()
{
System.out.println("method of class A");
}
}

class B extends A
{
void show()
{
System.out.println("method of class b");
}
}

class C extends A
{
void show()
{
System.out.println("method of class c");
}
}
class MethodDispath
{
public static void main(String args[])
{
class A a=new A();
class B b=new B();
class A c=new C();
A aa;
aa=a;
aa.show();
aa.b;
aa.show();
aa=c;
aa.show();
}
}

Abstract Demo Program in Java

2010-07-25T08:34:00.000-07:00

abstract class classA
{
abstract void show();
void display()
{
System.out.println("this is a concrete method");
}
}

class classB extends classA
{
void show()
{
System.out.println("classb implementation of show method");
}
}

class AbstractDemo
{
public static void main(String args[])
{
classB b1=new classB();
b1.show();
b1.display();
}
}

Program to calculate Area of Rectangle in java

2010-07-25T08:32:00.000-07:00

abstract class Figure
{
double dim1;
double dim2;
Figure(double a, double b)
{
dim1=a;
dim2=b;
}
abstract double area();
}
class Rectangle extends Figure
{
Rectangle(double a, double b)
{
super(a,b);
}

double area()
{
System.out.println("Area of Rectangle");
return(dim1*dim2);
}
}
class Triangle extends Figure
{
Triangle(double a, double b)
{
super(a,b);
}
double area()
{
System.out.println("area of triangle");
return(dim1*dim2/2);
}
}

class AbstractArea
{
public static void main(String args[])
{
Rectangle r=new Rectangle(10,5);
Triangle t=new Triangle(10,2);
Figure figref;
figref=r;
double d1=figref.area();
System.out.println(d1);
figref=t;
double d2=figref.area();
System.out.println(d2);
}
}

Java applet program for interest rate calculation

2010-07-25T05:45:00.002-07:00


import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*


*/
public class Loan extends Applet
implements ActionListener,ItemListener
{
 double p,r,n,total,i;
 String param1;
 boolean month;
 Label l1,l2,l3,l4;
 TextField t1,t2,t3,t4;
 Button b1,b2;
 CheckboxGroup cbg;
 Checkbox c1,c2;
 String str;
 public void init()
 {
  l1=new Label("Balance Amount",Label.LEFT);
  l2=new Label("Number of Months",Label.LEFT);
  l3=new Label("Interest Rate",Label.LEFT);
  l4=new Label("Total Payment",Label.LEFT);
  t1=new TextField(5);
  t2=new TextField(5);
  t3=new TextField(15);
  t4=new TextField(20);
  b1=new Button("OK");
  b2=new Button("Delete");
  cbg=new CheckboxGroup();
  c1=new Checkbox("Month Rate",cbg,true);
  c2=new Checkbox("Annual Rate",cbg,true);
  t1.addActionListener(this);
  t2.addActionListener(this);
  t3.addActionListener(this);
  t4.addActionListener(this);
  b1.addActionListener(this);
  b2.addActionListener(this);
  c1.addItemListener(this);
  c2.addItemListener(this);
  add(l1);
  add(t1);
  add(l2);
  add(t2);
  add(l3);
  add(t3);
  add(l4);
  add(t4);
  add(c1);
  add(c2);
  add(b1);
  add(b2);
 }
 public void itemStateChanged(ItemEvent ie)
 {
 }
 public void actionPerformed(ActionEvent ae)
 {
  str=ae.getActionCommand();
  if(str.equals("OK"))
  {
   p=Double.parseDouble(t1.getText());
   n=Double.parseDouble(t2.getText());
   r=Double.parseDouble(t3.getText());
   if(c2.getState())
   {
    n=n/12;
   }
   i=(p*n*r)/100;
   total=p+i;
   t4.setText(" "+total);
  }
  else if(str.equals("Delete"))
  {
   t1.setText(" ");
   t2.setText(" ");
   t3.setText(" ");
   t4.setText(" ");
  }
 }
}

Java applet program that allows the user to draw lines, rectangles and ovals

2010-07-25T05:45:00.001-07:00

Color c1=new Color(35-i,55-i,110-i);
g.setColor(c1);
g.drawRect(250+i,250+i,100+i,100+i);
g.drawOval(100+i,100+i,50+i,50+i);
g.drawLine(50+i,20+i,10+i,10+i);

Java program to implement a shape selector from a given set of shapes by Ranjith | April 4th, 2010. To implement a shape selector from a given set o

2010-07-25T05:44:00.001-07:00

import java.awt*;
import java.awt.event.*;
import java.applet.*;

public class fillcolor extends Applet implement Item Listener
{
checkbox red,yellow,black,blue.orange;
CheckboxGroup cbg;
String msg;
String s1="red";
String s2="yellow";
String s3="black";
String s4="orange";
public void init()
{
cbg = new CheckboxGroup();
red = new Chechbox("red",cbg,true);
yellow= new Checkbox("yellow",cbg,false);
black = new checkbox("black",cbg,false);
blue = new Checkbox("blue",cbg,false);
orange = new checkbox("orange".cbg.false);
add(red);
add(yellow);
add(black);
add(blue);
add(orange);
red.addItemListener(this);
yellow.addItemListener(this);
black.addItemListener(this);
blue.addItemListener(this);
orange.addItemListener(this);
}
publice void itemStartechanged(ItemEvent ie)
{
repaint();
}
publice void paint (Graphics g)
{
msg = cbg.getSelectedCheckbox().getLabel();
if(msg.compareTo(s1)==0)
{
setBackground(Color.red);
}
else if (msg.compareTo(s2)==0)
{
setBackground(Color.yellow);
}
else if(msg.compare To(s3)==0)
{
setBackground(color.black);
}
else if (msg.compareTo(s4)==o)
{
setBackground(Color.blue);
}
else
{
set Background(Color.orange);
}
}
}

Java program to implement a shape selector from a given set of shapes

2010-07-25T05:43:00.000-07:00

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class shape extend Applet implements itemListener
{
Chekbox reet,circle,line;
ChekboxGroup cbg;

String msg;
String s1="reet";
String s2="circle";
string s3="line";
publice void init()
{
cbg=new checkboxGroup();

rect = new checkbox("reet,cbg,tru);
circle = new Checkbox("circle",cbg.false);
line = new Checkbox("line",cbg,false);

add(reet);
add(circle);
add(line);

rect.addItemListener(this);
circle.addItemLisener(this);
line.addItemListener(this);
}
public void item StateChanged(ItemEvent ie)
{
repaint();
}
publice void paint(Graphics g)
{
msg=cbg.getSlectedCheckbox().getLabel();
if(masg.compareTo(s1)==0)
{
g.drawRect(10,40,40,80);
}
else if(msg.compareTo(s2)==0)
{
g.drawOvel(10,40,80,80);
}
else
{
g.drawLine(0,0,100,100);
}
}
}

Java program that illustrates how run time polymorphism is achieved

2010-07-25T05:42:00.002-07:00

figure f=new figure(45,6);
rectangle r=new rectangle(10,30);
triangle t=new triangle(10,20);
figure a;
a=f;
System.out.println(a.area());

Java Program for calculator

2010-07-25T05:42:00.001-07:00

JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
String buttons = “789/456*123-0.=+”;
for (int i = 0; i < buttons.length(); i++)
addButton(p, buttons.substring(i, i + 1));
add(p, “Center”);

Java program to display a clock

2010-07-25T05:41:00.000-07:00

background_ = new GSegment();
GStyle backgroundStyle = new GStyle();
backgroundStyle.setBackgroundColor (new Color (122, 136, 161));
backgroundStyle.setForegroundColor (new Color (0, 0, 0));
background_.setStyle (backgroundStyle);
addSegment (background_);

Java program to display Local machines IP Address

2010-07-25T05:40:00.002-07:00

import java.net.*;
import java.io.*;

public class ip_localmachine
{
public static void main(String args[]) throws Exception
{
InetAddress ipadd =InetAddress.getLocalHost();
System.out.println("Host and Address :"+ipadd);
System.out.println("Host name :"+ipadd.getHostName());

String n=ipadd.toString();
System.out.println("IP address :"+n.substring(n.indexOf("/")+1));
}
}

Java program that checks whether the given string is palindrome or not

2010-07-25T05:40:00.001-07:00

StringBuffer s1=new StringBuffer(args[0]);
StringBuffer s2=new StringBuffer(s1);
s1.reverse();
System.out.println(“Given String is:”+s2);
System.out.println(“Reverse String is”+s1);
Read More..

Java Program to multiply two matrices

2010-07-25T05:39:00.000-07:00

for(int j=i+1;j
{
if(names[i].compareTo(names[j])<0)
{
temp=names[i];
names[i]=names[j];
names[j]=temp;
}
}

Java program that displays the number of characters, lines and words in a text file

2010-07-25T05:38:00.002-07:00

while((c=isr.read())!=-1)
{
chars++;
if(c==’\n’)
lines++;
if(c==’\t’ || c==’ ‘ || c==’\n’)
++words;
if(chars!=0)
++chars;
}

Java program to display Domain name service (DNS)

2010-07-25T05:38:00.001-07:00

import java.net.*;

class dns
{
public static void main(String args[]) throws Exception
{
try
{
InetAddress[] address=InetAddress.getAllByName("java.sun.com");
for(int j=0;jSystem.out.println(address[j]);
}

catch(Exception e)
{
System.out.println("Error in accessing Internet :"+e);
}
}
}

Bitwise Operators in java

2010-06-02T07:59:00.000-07:00

class BitwiseOperators2 {
public static void main(String args[]) {
short s = 0xff;
System.out.println(s);
System.out.println(s & 0xf);
System.out.println(s | 1);
System.out.println(s ^ 1);
System.out.println(~s);
System.out.println(s >> 2);
System.out.println(s >>> 2);
System.out.println(s << 2);
}
}

Deadlock Demo in java

2010-06-02T07:56:00.000-07:00

class A
{
B b;

synchronized void a1()
{
System.out.println("Starting a1");
b.b2();
}

synchronized void a2()
{
System.out.println("Starting a2");
}
}

class B
{
A a;

synchronized void b1() {
System.out.println("Starting b1");
a.a2();
}

synchronized void b2() {
System.out.println("Starting b2");
}
}

class Thread1 extends Thread {
A a;

Thread1(A a) {
this.a = a;
}

public void run() {
for(int i = 0; i <>
a.a1();
}
}

class Thread2 extends Thread {
B b;

Thread2(B b) {
this.b = b;
}

public void run() {
for(int i = 0; i <>
b.b1();
}
}

class DeadlockDemo {

public static void main(String args[]) {

// Create objects
A a = new A();
B b = new B();
a.b = b;
b.a = a;

// Create threads
Thread1 t1 = new Thread1(a);
Thread2 t2 = new Thread2(b);
t1.start();
t2.start();

// Wait for threads to complete
try {
t1.join();
t2.join();
}
catch(Exception e) {
e.printStackTrace();
}

// Display message
System.out.println("Done!");
}
}

Project of Bank Demo in java

2010-06-02T07:53:00.000-07:00

class Account2 {
private int balance;

void deposit(int amount) {
synchronized(this) {
balance += amount;
}
}

int getBalance() {
return balance;
}
}

class Customer2 extends Thread {
Account2 account;

Customer2(Account2 account) {
this.account = account;
}

public void run() {
try {
for(int i = 0; i <>
account.deposit(10);
}
}
catch(Exception e) {
e.printStackTrace();
}
}
}

class BankDemo2 {
private final static int NUMCUSTOMERS = 10;

public static void main(String args[]) {

// Create account
Account2 account = new Account2();

// Create and start customer threads
Customer2 customers[] = new Customer2[NUMCUSTOMERS];
for(int i = 0; i <>
customers[i] = new Customer2(account);
customers[i].start();
}

// Wait for customer threads to complete
for(int i = 0; i <>
try {
customers[i].join();
}
catch(InterruptedException e) {
e.printStackTrace();
}
}

// Display account balance
System.out.println(account.getBalance());
}
}

Standard and Scientific Calculator In Java

2010-04-06T06:49:00.000-07:00

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class calculator extends JFrame implements ActionListener
{
JTextField jtx;
double temp,temp1,result,a;
static double m1,m2;
int k=1,x=0,y=0,z=0;
char ch;
JButton
one,two,three,four,five,six,seven,eight,nine,zero,clr,pow2,pow3,exp;
JButton
plus,min,div,lg,rec,mul,eq,plmi,poin,mr,mc,mp,mm,sqrt,sin,cos,tan;
JMenuBar bar;
JMenu view;
JMenuItem exit;
JRadioButtonMenuItem standard,scientific;
JSeparator jp;
ButtonGroup bg;
Container cont;
JPanel textPanel,syntpanel,buttonpanel;
calculator()
{
cont=getContentPane();
cont.setLayout(new BorderLayout());
JPanel textpanel=new JPanel();
Font font=new Font("Arial",Font.PLAIN,18);
jtx=new JTextField(25);
jtx.setFont(font);
jtx.setHorizontalAlignment(SwingConstants.RIGHT);
jtx.addKeyListener(new KeyAdapter()
{
public void keyTyped(KeyEvent keyevent)
{
char c=keyevent.getKeyChar();
if(c>='0' && c<='9')
{
}
else
{
keyevent.consume();
}
}
});
textpanel.add(jtx);
buttonpanel=new JPanel();
buttonpanel.setLayout(new GridLayout(5,4,2,2));
boolean t=true;
syntpanel=new JPanel();
syntpanel.setLayout(new GridLayout(5,1));
bar=new JMenuBar();
view=new JMenu("View");

standard =new JRadioButtonMenuItem("Standard",true);
standard.setMnemonic('S');
standard.addItemListener(new radiohandler());
scientific =new JRadioButtonMenuItem("Sceintific");
standard.setMnemonic('c');
scientific.addItemListener(new radiohandler());
jp=new JSeparator();
exit=new JMenuItem("Exit");
standard.setMnemonic('E');
exit.addActionListener(this);
bg=new ButtonGroup();
bg.add(standard);
bg.add(scientific);
view.add(standard);
view.add(scientific);
view.add(jp);
view.add(exit);
bar.add(view);
setJMenuBar(bar);

mr=new JButton("MR");
buttonpanel.add(mr);
mr.addActionListener(this);
seven=new JButton("7");
buttonpanel.add(seven);
seven.addActionListener(this);
eight=new JButton("8");
buttonpanel.add(eight);
eight.addActionListener(this);
nine=new JButton("9");
buttonpanel.add(nine);
nine.addActionListener(this);
clr=new JButton("AC");
buttonpanel.add(clr);
clr.addActionListener(this);

mc=new JButton("MC");
buttonpanel.add(mc);
mc.addActionListener(this);
four=new JButton("4");
buttonpanel.add(four);
four.addActionListener(this);
five=new JButton("5");
buttonpanel.add(five);
five.addActionListener(this);
six=new JButton("6");
buttonpanel.add(six);
six.addActionListener(this);
mul=new JButton("*");
buttonpanel.add(mul);
mul.addActionListener(this);

mp=new JButton("M+");
buttonpanel.add(mp);
mp.addActionListener(this);
one=new JButton("1");
buttonpanel.add(one);
one.addActionListener(this);
two=new JButton("2");
buttonpanel.add(two);
two.addActionListener(this);
three=new JButton("3");
buttonpanel.add(three);
three.addActionListener(this);
min=new JButton("-");
buttonpanel.add(min);
min.addActionListener(this);

mm=new JButton("M-");
buttonpanel.add(mm);
mm.addActionListener(this);
zero=new JButton("0");
buttonpanel.add(zero);
zero.addActionListener(this);
plmi=new JButton("+/-");
buttonpanel.add(plmi);
plmi.addActionListener(this);
poin=new JButton(".");
buttonpanel.add(poin);
poin.addActionListener(this);
plus=new JButton("+");
buttonpanel.add(plus);
plus.addActionListener(this);

rec=new JButton("1/x");
buttonpanel.add(rec);
rec.addActionListener(this);
sqrt=new JButton("Sqrt");
buttonpanel.add(sqrt);
sqrt.addActionListener(this);
lg=new JButton("log");
buttonpanel.add(lg);
lg.addActionListener(this);
div=new JButton("/");
div.addActionListener(this);
buttonpanel.add(div);
eq=new JButton("=");
buttonpanel.add(eq);
eq.addActionListener(this);

sin=new JButton("SIN");
syntpanel.add(sin);
sin.addActionListener(this);
cos=new JButton("COS");
syntpanel.add(cos);
cos.addActionListener(this);
tan=new JButton("TAN");
syntpanel.add(tan);
tan.addActionListener(this);
pow2=new JButton("x^2");
syntpanel.add(pow2);
pow2.addActionListener(this);
pow3=new JButton("x^3");
syntpanel.add(pow3);
pow3.addActionListener(this);
exp=new JButton("Exp");
exp.addActionListener(this);

cont.add("Center",buttonpanel);
cont.add("North",textpanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
class radiohandler implements ItemListener
{
public void itemStateChanged(ItemEvent ie)
{
AbstractButton button=(AbstractButton)ie.getItem();
String label=button.getText();
{
if(label.equals("Standard"))
{
cont.remove(syntpanel);
validate();
}
if(label.equals("Sceintific"))
{
cont.add("West",syntpanel);
validate();
}
}
}
}
public void actionPerformed(ActionEvent e)
{
String s=e.getActionCommand();
if(s.equals("Exit"))
{
System.exit(0);
}
if(s.equals("1"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"1");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"1");
z=0;
}
}
if(s.equals("2"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"2");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"2");
z=0;
}
}
if(s.equals("3"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"3");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"3");
z=0;
}
}
if(s.equals("4"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"4");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"4");
z=0;
}
}
if(s.equals("5"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"5");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"5");
z=0;
}
}
if(s.equals("6"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"6");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"6");
z=0;
}
}
if(s.equals("7"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"7");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"7");
z=0;
}
}
if(s.equals("8"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"8");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"8");
z=0;
}
}
if(s.equals("9"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"9");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"9");
z=0;
}
}
if(s.equals("0"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"0");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"0");
z=0;
}
}
if(s.equals("AC"))
{
jtx.setText("");
x=0;
y=0;
z=0;
}
if(s.equals("log"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.log(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("1/x"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=1/Double.parseDouble(jtx.getText());
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("Exp"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.exp(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("x^2"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.pow(Double.parseDouble(jtx.getText()),2);
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("x^3"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.pow(Double.parseDouble(jtx.getText()),3);
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("+/-"))
{
if(x==0)
{
jtx.setText("-"+jtx.getText());
x=1;
}
else
{
jtx.setText(jtx.getText());
}
}
if(s.equals("."))
{
if(y==0)
{
jtx.setText(jtx.getText()+".");
y=1;
}
else
{
jtx.setText(jtx.getText());
}
}
if(s.equals("+"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=0;
ch='+';
}
else
{
temp=Double.parseDouble(jtx.getText());
jtx.setText("");
ch='+';
y=0;
x=0;
}
jtx.requestFocus();
}
if(s.equals("-"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=0;
ch='-';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
jtx.setText("");
ch='-';
}
jtx.requestFocus();
}
if(s.equals("/"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=1;
ch='/';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
ch='/';
jtx.setText("");
}
jtx.requestFocus();
}
if(s.equals("*"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=1;
ch='*';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
ch='*';
jtx.setText("");
}
jtx.requestFocus();
}
if(s.equals("MC"))
{
m1=0;
jtx.setText("");
}
if(s.equals("MR"))
{
jtx.setText("");
jtx.setText(jtx.getText() + m1);
}
if(s.equals("M+"))
{
if(k==1)
{
m1=Double.parseDouble(jtx.getText());
k++;
}
else
{
m1+=Double.parseDouble(jtx.getText());
jtx.setText(""+m1);
}
}
if(s.equals("M-"))
{
if(k==1)
{
m1=Double.parseDouble(jtx.getText());
k++;
}
else
{
m1-=Double.parseDouble(jtx.getText());
jtx.setText(""+m1);
}
}
if(s.equals("Sqrt"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.sqrt(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("SIN"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.sin(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("COS"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.cos(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("TAN"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
a=Math.tan(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}
if(s.equals("="))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
temp1 = Double.parseDouble(jtx.getText());
switch(ch)
{
case '+':
result=temp+temp1;
break;
case '-':
result=temp-temp1;
break;
case '/':
result=temp/temp1;
break;
case '*':
result=temp*temp1;
break;
}
jtx.setText("");
jtx.setText(jtx.getText() + result);
z=1;
}
}
jtx.requestFocus();
}
public static void main(String args[])
{
calculator n=new calculator();
n.setTitle("CALCULATOR");
n.setSize(370,250);
n.setResizable(false);
n.setVisible(true);
}
}

School Management System Project In Java

2010-04-06T06:45:00.000-07:00

//Case Study

import java.awt.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;

public class ProjectX extends JFrame implements ChangeListener,
ActionListener
{
static int choice = 0;
static String line = "--------------------------------";
DataInputStream inputData = new DataInputStream(System.in);
private Registration studentDetails = new Registration();
int topScore = studentDetails.getTopScore();
int passMarks = studentDetails.getPassMarks();
int firstClass = studentDetails.getFirstClass();
int secondClass = studentDetails.getSecondClass();

JTabbedPane tabbedPane = new JTabbedPane();
JLabel statusLabel = new JLabel();
JLabel titleLabel = new JLabel("Student Software Beta Edition");
JPanel addStudentPanel = new JPanel();
JTextField studentName = new JTextField();
JTextField physicsMarks = new JTextField();
JTextField biologyMarks = new JTextField();
JTextField mathsMarks = new JTextField();
JButton submitDetails = new JButton("Submit Details");
JPanel studentDetailsPanel = new JPanel();
JTextField studentID1 = new JTextField();
JTextArea studentInfo = new JTextArea();
JButton submitID1 = new JButton("Submit ID");
JPanel studentGradePanel = new JPanel();
JTextField studentID2 = new JTextField();
JTextArea studentGrade = new JTextArea();
JButton submitID2 = new JButton("Submit ID");
JPanel numberPassedPanel = new JPanel();
JTextArea studentPassed = new JTextArea();
JPanel classTopperPanel = new JPanel();
JTextArea studentTopper = new JTextArea();

public ProjectX(String frameTitle)
{
super(frameTitle);
setResizable(true);
setSize(400,400);
submitDetails.addActionListener(this);
submitID1.addActionListener(this);
submitID2.addActionListener(this);

getContentPane().setLayout(new BorderLayout());

getContentPane().add(titleLabel,"North");

tabbedPane.addTab("Add Student",addStudentPanel);
addStudentPanel.setLayout(new GridLayout(8,2,5,5));
addStudentPanel.add(new JLabel("Student Name: "));
addStudentPanel.add(studentName);
addStudentPanel.add(new JLabel("Physics Marks: "));
addStudentPanel.add(physicsMarks);
addStudentPanel.add(new JLabel("Biology Marks: "));
addStudentPanel.add(biologyMarks);
addStudentPanel.add(new JLabel("Maths Marks: "));
addStudentPanel.add(mathsMarks);
addStudentPanel.add(submitDetails);

tabbedPane.addTab("Student Details",studentDetailsPanel);
studentDetailsPanel.add(new JLabel("Enter Student ID: "));
studentDetailsPanel.add(studentID1);
studentDetailsPanel.add(submitID1);
studentDetailsPanel.add(new JLabel("Student Details:"));
studentDetailsPanel.add(studentInfo);

tabbedPane.addTab("Student Grade",studentGradePanel);
studentGradePanel.setLayout(new GridLayout(5,2,5,5));
studentGradePanel.add(new JLabel("Enter Student ID: "));
studentGradePanel.add(studentID2);
studentGradePanel.add(submitID2);
studentGradePanel.add(new JLabel("Student Grade:"));
studentGradePanel.add(studentGrade);

tabbedPane.addTab("Passed Student",numberPassedPanel);
numberPassedPanel.setLayout(new GridLayout(2,2,5,5));
numberPassedPanel.add(new JLabel("Number of Student Passed: "));
numberPassedPanel.add(studentPassed);

tabbedPane.addTab("Class Topper",classTopperPanel);
classTopperPanel.setLayout(new GridLayout(2,2,5,5));
classTopperPanel.add(new JLabel("Here are the class Toppers: "));
classTopperPanel.add(studentTopper);

tabbedPane.addChangeListener(this);
getContentPane().add(tabbedPane,"Center");

statusLabel.setText("Status: Normal");
getContentPane().add(statusLabel,"South");

setVisible(true);

}

public static void main(String args[])
{
ProjectX outputScreen = new ProjectX("Case Study");
}

public String setStudentInfo()
{
int id = studentDetails.addStudent(studentName.getText(),
Integer.parseInt(physicsMarks.getText()),
Integer.parseInt(biologyMarks.getText()),
Integer.parseInt(mathsMarks.getText()));
return
(" " +
line +
"Record Created For " + studentName +
"
" +
"Student ID: " + id +
"
" +
line );
}

public String getStudentInfo()
{
int id = Integer.parseInt(studentID1.getText());
if(studentDetails.getStudentDetails(id))
return ("
" +
line +
"Student Details
" +
line +
"Student ID:" + " " + id + "
" +
"Student Name:" + " " + studentDetails.studentName + "
" +
"Physics Marks:" + " " + studentDetails.physicsMarks + "
" +
"Biology Marks:" + " " + studentDetails.biologyMarks + "
" +
"Maths Marks:" + " " + studentDetails.mathsMarks + "
" +
line );
else
return("
Records Not Found for ID " + id);
}

public String getStudentGrade()
{
int id = Integer.parseInt(studentID2.getText());
studentDetails.getStudentDetails(id);
String grade;
if(studentDetails.studentName == null)
{
System.out.println("
Records Not Found for ID " + id);
return null;
}
if(studentDetails.physicsMarks <>
studentDetails.biologyMarks <>
passMarks)
{
grade = "Failed";
}
else
{
int avgMarks = (studentDetails.physicsMarks +
studentDetails.biologyMarks + studentDetails.mathsMarks)/3;
if(avgMarks >= passMarks && avgMarks < grade =" ">
Class";
else if(avgMarks >= secondClass && avgMarks < grade ="
"Second Class";
else if(avgMarks >= firstClass && avgMarks < grade =" ">
Class";
else grade = "Distinction";
}
return(line + "Grade For " + studentDetails.studentName + " is " + grade
+ "
" + line);
}

public String getNumberPasses()
{
int lastID = Registration.getNextID() -1;
boolean passed = true;
int numberPassed = 0;
for(int id = 1; id <= lastID; id++)
{
studentDetails.getStudentDetails(id);
if(studentDetails.physicsMarks >= passMarks &&
studentDetails.biologyMarks >= passMarks && studentDetails.mathsMarks >=
passMarks) numberPassed++;
}
return(line + "Number of Student Passed: " + numberPassed + "
" +
line);
}

public String getClassTopper()
{
int lastID = Registration.getNextID() -1;
String classTopper;
StringBuffer buffer = new StringBuffer(500);
int topMarks = 0;
for(int id = 1; id <= lastID; id++)
{
studentDetails.getStudentDetails(id);
int studentMarks = studentDetails.physicsMarks +
studentDetails.biologyMarks + studentDetails.mathsMarks;
if(studentMarks > topMarks) topMarks = studentMarks;
}
buffer.append(line + "Student Having Top Marks:
");
for(int id = 1; id <= lastID; id++)
{
studentDetails.getStudentDetails(id);
int studentMarks = studentDetails.physicsMarks +
studentDetails.biologyMarks + studentDetails.mathsMarks;
if(studentMarks == topMarks)
{
buffer.append(studentDetails.studentName + " Having Total Marks: " +
topMarks + "
");
}
}
buffer.append(line);
return(buffer.toString());
}

public void stateChanged(ChangeEvent e)
{
switch(tabbedPane.getSelectedIndex())
{
case 3: studentPassed.setText(getNumberPasses());
break;
case 4: studentTopper.setText(getClassTopper());
break;
}
}

public void actionPerformed(ActionEvent e)
{
if(e.getSource() == submitID1)
{
studentInfo.setText(getStudentInfo());
}
else if(e.getSource() == submitID2)
{
studentGrade.setText(getStudentGrade());
}
if(e.getSource() == submitDetails)
{
setStudentInfo();
}
}

}

//Registration Class
class Registration
{
private int topScore = 90;
private int passMarks = 35;
private int firstClass = 65;
private int secondClass = 45;
private static String idFile = "id.dat";
private static String studentFile = "stdfile.dat";

public int id;
public String studentName;
public int physicsMarks;
public int biologyMarks;
public int mathsMarks;

public int addStudent(String studentName, int physicsMarks, int
biologyMarks, int mathsMarks)
{
int id = 0;
try
{
FileWriter fileOutput = new FileWriter(Registration.studentFile,true);
id = Registration.getNextID();
String buffer = id + "|" + studentName + "|" + physicsMarks + "|" +
biologyMarks + "|" + mathsMarks + "
";
fileOutput.write(buffer);
fileOutput.close();
Registration.setID(id);
}
catch(IOException e)
{
System.err.println(e.toString());
System.exit(1);
}
return id;

}

//Function to get the details of a student given the ID
public boolean getStudentDetails(int id)
{
try
{
FileReader fileInput = new FileReader(Registration.studentFile);
BufferedReader br = new BufferedReader(fileInput);
{

String str;
while((str = br.readLine()) != null)
{
StringTokenizer fields = new StringTokenizer(str,"|");
if(Integer.parseInt(fields.nextToken()) == id)
{
this.id = id;
this.studentName = fields.nextToken();
this.physicsMarks = Integer.parseInt(fields.nextToken());
this.biologyMarks = Integer.parseInt(fields.nextToken());
this.mathsMarks = Integer.parseInt(fields.nextToken());
return true;
}
}
}

}

catch(IOException e)
{
System.err.println(e.toString());
System.exit(1);
}

return false;
}

public int getTopScore()
{
return topScore;
}

public int getPassMarks()
{
return passMarks;
}

public int getFirstClass()
{
return firstClass;
}

public int getSecondClass()
{
return secondClass;
}

//Function to get the next ID available
public static int getNextID()
{
int id = 0;
try
{
RandomAccessFile studentIDFile = new
RandomAccessFile(Registration.idFile,"rw");
if(studentIDFile.length() == 0)
{
id = 0;
}
else id = studentIDFile.readInt();
id++;
studentIDFile.close();
}

catch(IOException e)
{
System.err.println(e.toString());
System.exit(1);
}
return id;
}

//Function to Store current ID in a file
public static void setID(int id)
{
try
{
RandomAccessFile studentIDFile = new
RandomAccessFile(Registration.idFile,"rw");
studentIDFile.seek(0);
studentIDFile.writeInt(id);
studentIDFile.close();
}

catch(IOException e)
{
System.err.println(e.toString());
System.exit(1);
}
}
}

Program to Set the foreground and background color to the text area in Java

2010-04-06T06:44:00.000-07:00

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

class colopat extends Frame
{
Checkbox r,g,b;
Checkbox m,y,gr,p,w,bl,c;
TextArea ta;
Checkbox r1,g1,b1;
Checkbox m1,y1,gr1,p1,w1,bl1,c1;
Label ba,fo;
Panel pa1,p2,p3;

colopat()
{
setSize(800,600);

setLayout(new BorderLayout());
pa1=new Panel(new GridLayout(5,2,10,10));
p2=new Panel(new GridLayout(5,2,10,10));

CheckboxGroup cbg=new CheckboxGroup();

r=new Checkbox("red",cbg,false);
g=new Checkbox("green",cbg,false);
b=new Checkbox("blue",cbg,false);
m=new Checkbox("megenta",cbg,false);
y=new Checkbox("yellow",cbg,false);
gr=new Checkbox("grey",cbg,false);
p=new Checkbox("pink",cbg,false);
w=new Checkbox("white",cbg,false);
bl=new Checkbox("black",cbg,true);
c=new Checkbox("cyan",cbg,false);
ba=new Label("BACKGROUND COLORS",Label.CENTER);
ba.setBackground(Color.pink);

pa1.add(ba);
pa1.add(r);
pa1.add(b);
pa1.add(m);
pa1.add(y);
pa1.add(gr);
pa1.add(p);
pa1.add(w);
pa1.add(bl);
pa1.add(c);
add("West",pa1);

ta=new TextArea(5,25);
p3=new Panel(new GridLayout(3,1));
p3.add(new Label("Text Area",1));
p3.add(ta);
add("Center",p3);

r.addItemListener(new CheckBoxHandler(this));
g.addItemListener(new CheckBoxHandler(this));
b.addItemListener(new CheckBoxHandler(this));
m.addItemListener(new CheckBoxHandler(this));
y.addItemListener(new CheckBoxHandler(this));
gr.addItemListener(new CheckBoxHandler(this));
p.addItemListener(new CheckBoxHandler(this));
w.addItemListener(new CheckBoxHandler(this));
c.addItemListener(new CheckBoxHandler(this));
bl.addItemListener(new CheckBoxHandler(this));

CheckboxGroup cbg1=new CheckboxGroup();
r1=new Checkbox("red",cbg1,false);
g1=new Checkbox("green",cbg1,false);
b1=new Checkbox("blue",cbg1,false);
m1=new Checkbox("megenta",cbg1,false);
y1=new Checkbox("yellow",cbg1,false);
gr1=new Checkbox("grey",cbg1,false);
p1=new Checkbox("pink",cbg1,false);
w1=new Checkbox("white",cbg1,false);
bl1=new Checkbox("black",cbg1,true);
c1=new Checkbox("cyan",cbg1,false);
fo=new Label("FOREGROUND COLORS");
fo.setBackground(Color.pink);

p2.add(fo);
p2.add(c1);
p2.add(g1);
p2.add(b1);
p2.add(m1);
p2.add(y1);
p2.add(gr1);
p2.add(p1);
p2.add(w1);
p2.add(bl1);
p2.add(c1);
add("East",p2);

r1.addItemListener(new CheckBoxHandler(this));
g1.addItemListener(new CheckBoxHandler(this));
b1.addItemListener(new CheckBoxHandler(this));
m1.addItemListener(new CheckBoxHandler(this));
y1.addItemListener(new CheckBoxHandler(this));
gr1.addItemListener(new CheckBoxHandler(this));
p1.addItemListener(new CheckBoxHandler(this));
w1.addItemListener(new CheckBoxHandler(this));
c1.addItemListener(new CheckBoxHandler(this));
bl1.addItemListener(new CheckBoxHandler(this));
c1.addItemListener(new CheckBoxHandler(this));

addWindowListener(new mywindowAdapter(this));

setVisible(true);
}

public static void main(String args[])
{
new colopat();
}
}

class CheckBoxHandler implements ItemListener
{
colopat cp;

CheckBoxHandler(colopat cp)
{
this.cp=cp;
}
public void itemStateChanged(ItemEvent ie)
{
if(cp.r.getState())
cp.ta.setBackground(Color.red);
else if(cp.g.getState())
cp.ta.setBackground(Color.green);
else if(cp.b.getState())
cp.ta.setBackground(Color.blue);
else if(cp.m.getState())
cp.ta.setBackground(Color.magenta);
else if(cp.y.getState())
cp.ta.setBackground(Color.yellow);
else if(cp.gr.getState())
cp.ta.setBackground(Color.lightGray);
else if(cp.bl.getState())
cp.ta.setBackground(Color.black);
else if(cp.w.getState())
cp.ta.setBackground(Color.white);
else if(cp.p.getState())
cp.ta.setBackground(Color.pink);
else
cp.ta.setBackground(Color.cyan);

if(cp.r1.getState())
cp.ta.setForeground(Color.red);
else if(cp.g1.getState())
cp.ta.setForeground(Color.green);
else if(cp.b1.getState())
cp.ta.setForeground(Color.blue);
else if(cp.m1.getState())
cp.ta.setForeground(Color.magenta);
else if(cp.y1.getState())
cp.ta.setForeground(Color.yellow);
else if(cp.gr1.getState())
cp.ta.setForeground(Color.lightGray);
else if(cp.bl1.getState())
cp.ta.setForeground(Color.black);
else if(cp.w1.getState())
cp.ta.setForeground(Color.white);
else if(cp.p1.getState())
cp.ta.setForeground(Color.pink);
else
cp.ta.setForeground(Color.cyan);
}
}

class mywindowAdapter extends WindowAdapter
{
colopat cp;

mywindowAdapter(colopat cp)
{
this.cp=cp;
}
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}

Program to convert numbers in a file to corresponding words.

2010-04-06T06:01:00.000-07:00

import java.io.*;
import java.lang.*;

class NumToWords
{
public static void main(String a[]) throws IOException
{
String s="";
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter filename : ");
try
{
s=br.readLine();
}catch(Exception e){}
InputStream in=new FileInputStream(s);
MyInputStream mis=new MyInputStream(in);
mis.changeNumbers();
in.close();
mis.close();
}
}
class MyInputStream extends FilterInputStream
{
InputStream is;
MyInputStream(InputStream in)
{
super(in);
is=in;
}
public void changeNumbers() throws IOException
{
PushbackInputStream pis;
String num="";
char ch;
int c;
pis=new PushbackInputStream(is);
while((c=pis.read())!=-1)
{
ch=(char)c;
if('0'<=ch&&ch<='9')
{
num="";
while('0'<=ch&&ch<='9'&&c!=-1)
{
num=num+ch;
c=pis.read();
ch=(char)c;
}
System.out.print(MyInputStream.process(num));
pis.unread(ch);
}
else
System.out.print(ch);
}
}
static String process(String str)
{
String a1[]={"One","Two","Three","Four","Five","Six","Seven","Eight","Nine"};
String a2[]={"Twenty","Thirty","Fourty","Fifty","Sixty","Seventy","Eighty","Ninety"};
String a3[]={"Ten","Eleven","Twelve","Thirteen","Fourteen","Fifteen","Sixteen","Seventeen","Eighteen","Nineteen"};
String a4[]={"Hundered","Thousand","Lakhs","Crores"};
int num=0;
try
{
num=Integer.parseInt(str);
}catch(Exception e){}
if(num==0)
return "Zero";
int n,n1;
String ans="";
String ans1="";
n1=num%10;
num=num/10;
if(n1!=0)
ans=a1[n1-1];
if(num>0)
{
n=num%10;
num=num/10;
if(n==1)
ans=a3[n1];
else if(n!=0)
ans=a2[n-2]+" "+ans;
}
if(num>0)
{
n=num%10;
num=num/10;
if(n!=0)
ans=a1[n-1]+" "+a4[0]+" "+ans;
}
for(int i=1;num>0;i++)
{
n1=num%10;
num=num/10;
if(n1!=0)
ans1=a1[n1-1];
if(num>0)
{
n=num%10;
num=num/10;
if(n==1)
ans1=a3[n1];
else if(n!=0)
ans1=a2[n-2]+" "+ans1;
}
ans=ans1+" "+a4[i]+" "+ans;
ans1="";
}
return(ans);
}
}

Program to counting number of Chars, Words and Lines in a given file in Java

2010-04-06T05:59:00.000-07:00

import java.lang.*;
import java.io.*;
import java.util.*;
class WordCount
{
public static void main(String arg[]) throws Exception
{
int char_count=0;
int word_count=0;
int line_count=0;
String s;
StringTokenizer st;
BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter filename : ");
s=buf.readLine();
buf=new BufferedReader(new FileReader(s));
while((s=buf.readLine())!=null)
{
line_count++;
st=new StringTokenizer(s," ,;:.");
while(st.hasMoreTokens())
{
word_count++;
s=st.nextToken();
char_count+=s.length();
}
}
System.out.println("Character Count : "+char_count);
System.out.println("Word Count : "+word_count);
System.out.println("Line Count : "+line_count);
buf.close();
}
}

student management system Project In Java

2010-04-05T09:43:00.000-07:00

import java.io.*;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;

public class menu extends Frame implements
WindowListener,ActionListener
{
MenuBar mb;
MenuItem student,rollnowise,namewise,allresult;
public static menu m;
rollnowise rw;
namewise n;
student st;
int x,y,d;

public menu()
{
super("menu ARPAN");
addWindowListener(this);
x=y=700;
d=10;
setSize(x,y);
setBackground(Color.orange);
addMenu();
show();
}

public static void main(String args[])
{
m=new menu();
}

void addMenu()
{
MenuBar mb=new MenuBar();
Menu register=new Menu("REGISTER");
Menu inquery=new Menu("INQUERY");
register.add("STUDENT");
register.add("EXIT");
inquery.add("ROLLNOWISE");
inquery.add("NAMEWISE");

mb.add(register);
mb.add(inquery);

setMenuBar(mb);

register.addActionListener(this);
inquery.addActionListener(this);

}

public void actionPerformed(ActionEvent ae)

{
String arg=ae.getActionCommand();
if(ae.getSource() instanceof Menu)
if(arg.equals("EXIT"))
{
System.exit(0);
}
if(ae.getSource() instanceof Menu)
if("STUDENT".equals(arg))
{
st=new student();
st.show();
}
if(ae.getSource() instanceof Menu)
if("ROLLNOWISE".equals(arg))
{
rw=new rollnowise();
rw.show();
}
if(ae.getSource() instanceof Menu)
if("NAMEWISE".equals(arg))
{
n=new namewise();
n.show();
}
}

public void windowClosed(WindowEvent we){}
public void windowDeiconified(WindowEvent we){}
public void windowIconified(WindowEvent we){}
public void windowActivated(WindowEvent we){}
public void windowDeactivated(WindowEvent we){}
public void windowOpened(WindowEvent we){}
public void windowClosing(WindowEvent we)
{
while(x>0 && y>0)
{
setSize(x,y);
x=x-d;
y=y-d;
show();
}
System.out.println("mail me at arpankumarsingh@yahoo.com");
dispose();
System.exit(0);

}
}

//class for name wise report

class namewise extends Frame implements WindowListener,ActionListener
{
public static namewise nw;
Label l1=new Label("NAME",Label.LEFT);
Label l2=new Label("ROLLNO",Label.LEFT);
Label l3=new Label("COLG",Label.LEFT);
Label l4=new Label("SUB1",Label.LEFT);
Label l5=new Label("SUB2",Label.LEFT);
Label l6=new Label("SUB3",Label.LEFT);
Label l7=new Label("SUB4",Label.LEFT);
Label l8=new Label("SUB5",Label.LEFT);
TextField tf_entername=new TextField(20);
Button but_entername =new Button("FIND");
Button ok=new Button("OK");
Graphics g;
String sqlstr;
Statement st;
GridLayout gl=new GridLayout(1,2);
GridLayout cl=new GridLayout(1,5);

Font font18=new Font("VinetaBT",Font.BOLD|Font.ITALIC,18);

int x,y,d;
Dialog dlg;
Label msg;

public namewise()
{
super("NAMEWISE");
addWindowListener(this);
setLayout(new GridLayout(12,1));
setBackground(Color.orange);
setForeground(Color.black);
addMenu();
x=550;

y=450;
d=100;
setSize(x,y);
show();
}

void addMenu()
{
Panel p4=new Panel();
Label l11=new Label("ENTERNAME");

p4.add(l11);
p4.add(tf_entername);
p4.add(but_entername);
add(p4);

but_entername.addActionListener(this);
ok.addActionListener(this);

//Dialog for confirmation

dlg=new Dialog(this,"Inventory Management System",false);
dlg.setLayout(new GridLayout(2,1));
dlg.setSize(100,100);
dlg.setLocation(200,100);
ok.setSize(50,50);
msg=new Label("NAME NOT FOUND");
dlg.add(msg);
dlg.add(ok);

}

public void actionPerformed(ActionEvent e)
{
Panel p1=new Panel();
l1.setFont(font18);
l2.setFont(font18);
p1.setLayout(gl);
p1.add(l1);
p1.add(l2);
g=getGraphics();
g.drawLine(40,0,40,0);

Panel p2=new Panel();
l3.setFont(font18);
p2.add(l3);
p2.setLayout(gl);

Panel p3=new Panel();
l4.setFont(font18);
l5.setFont(font18);
l6.setFont(font18);
l7.setFont(font18);
l8.setFont(font18);

p3.add(l4);
p3.add(l5);
p3.add(l6);
p3.add(l7);
p3.add(l8);
p3.setLayout(cl);

String arg=e.getActionCommand();
if(e.getSource() instanceof Button)
if("FIND".equals(arg))
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection
con=DriverManager.getConnection("jdbc:odbc:stu","","");
sqlstr="select * from stu1 where NAME='"+
tf_entername.getText()+"'";
st=con.createStatement();
ResultSet rs;
rs= st.executeQuery(sqlstr);

while(rs.next())
{
Panel a1=new Panel();
l1=new Label("",Label.LEFT);
l2=new Label("",Label.LEFT);
l1.setFont(font18);
l2.setFont(font18);
a1.setLayout(gl);

Panel a2=new Panel();
l3=new Label("",Label.LEFT);
l3.setFont(font18);
a2.setLayout(gl);

Panel a3=new Panel();
l4=new Label("",Label.LEFT);
l5=new Label("",Label.LEFT);
l6=new Label("",Label.LEFT);
l7=new Label("",Label.LEFT);
l8=new Label("",Label.LEFT);
l4.setFont(font18);

l5.setFont(font18);

l6.setFont(font18);

l7.setFont(font18);

l8.setFont(font18);
a3.setLayout(cl);

l1.setText(rs.getString("NAME"));
l2.setText(""+rs.getInt("ROLLNO"));
l3.setText(rs.getString("COLG"));
l4.setText(""+rs.getInt("SUB1"));
l5.setText(""+rs.getInt("SUB2"));
l6.setText(""+rs.getInt("SUB3"));
l7.setText(""+rs.getInt("SUB4"));
l8.setText(""+rs.getInt("SUB5"));

a1.add(l1);
a1.add(l2);

a2.add(l3);

a3.add(l4);
a3.add(l5);
a3.add(l6);
a3.add(l7);
a3.add(l8);

add(p1);
add(a1);

add(p2);
add(a2);

add(p3);
add(a3);
show();
}
}
catch(ClassNotFoundException se)
{
tf_entername.setText("Error : " + se.toString());

}
catch(SQLException se)
{
tf_entername.setText("Error : " + se.toString());

}
}

public void windowClosed(WindowEvent we){}
public void windowDeiconified(WindowEvent we){}
public void windowIconified(WindowEvent we){}
public void windowActivated(WindowEvent we){}
public void windowDeactivated(WindowEvent we){}
public void windowOpened(WindowEvent we){}

public void windowClosing(WindowEvent we)
{
while(x>0 && y>0)
{
setSize(x,y);
x=x-d;
y=y-d;
show();
}
dispose();

}
}

//class for rollnowise report
class rollnowise extends Frame implements
WindowListener,ActionListener
{

public static rollnowise rw;
Label l1=new Label("NAME",Label.LEFT);
Label l2=new Label("ROLLNO",Label.LEFT);
Label l3=new Label("COLG",Label.LEFT);
Label l4=new Label("SUB1",Label.LEFT);
Label l5=new Label("SUB2",Label.LEFT);
Label l6=new Label("SUB3",Label.LEFT);
Label l7=new Label("SUB4",Label.LEFT);
Label l8=new Label("SUB5",Label.LEFT);
TextField tf_entername=new TextField(20);
Button but_entername =new Button("FIND");
String sqlstr;
Statement st;
GridLayout gl=new GridLayout(1,2);
GridLayout cl=new GridLayout(1,5);

Font font18=new Font("VinetaBT",Font.BOLD|Font.ITALIC,18);

int x,y,d;

public rollnowise()
{
super("ROLLNOWISE");
addWindowListener(this);
setLayout(new GridLayout(12,1));
setBackground(Color.orange);
setForeground(Color.black);
addMenu();
x=550;
y=450;
d=100;
setSize(x,y);
show();
}

void addMenu()
{
Panel p4=new Panel();
Label l11=new Label("ENTERROLLNO");

p4.add(l11);
p4.add(tf_entername);
p4.add(but_entername);
add(p4);

but_entername.addActionListener(this);
}

public void actionPerformed(ActionEvent e)
{
Panel p1=new Panel();
l1.setFont(font18);
l2.setFont(font18);
p1.setLayout(gl);

p1.add(l1);
p1.add(l2);
l3.setFont(font18);
Panel p2=new Panel();
p2.add(l3);
p2.setLayout(gl);

Panel p3=new Panel();

l4.setFont(font18);

l5.setFont(font18);

l6.setFont(font18);

l7.setFont(font18);

l8.setFont(font18);
p3.add(l4);
p3.add(l5);
p3.add(l6);
p3.add(l7);
p3.add(l8);
p3.setLayout(cl);

/* Panel p4=new Panel();
Label l11=new Label("ENTERROLLNO");

p4.add(l11);
p4.add(tf_entername);
p4.add(but_entername);
add(p4);
add(p1);
add(p2);
add(p3);
*/
String arg=e.getActionCommand();
if(e.getSource() instanceof Button)
if("FIND".equals(arg))
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection
con=DriverManager.getConnection("jdbc:odbc:stu","","");
sqlstr="select * from stu1 where ROLLNO="+
tf_entername.getText()+"";
st=con.createStatement();
ResultSet rs;
rs= st.executeQuery(sqlstr);

while(rs.next())
{
Panel a1=new Panel();
l1=new Label("",Label.LEFT);
l2=new Label("",Label.LEFT);
l1.setFont(font18);
l2.setFont(font18);
a1.setLayout(gl);

Panel a2=new Panel();
l3=new Label("",Label.LEFT);
l3.setFont(font18);
a2.setLayout(gl);

Panel a3=new Panel();
l4=new Label("",Label.LEFT);
l5=new Label("",Label.LEFT);
l6=new Label("",Label.LEFT);
l7=new Label("",Label.LEFT);
l8=new Label("",Label.LEFT);
l4.setFont(font18);

l5.setFont(font18);

l6.setFont(font18);

l7.setFont(font18);

l8.setFont(font18);
a3.setLayout(cl);

l1.setText(rs.getString("NAME"));
l2.setText(""+rs.getInt("ROLLNO"));
l3.setText(rs.getString("COLG"));
l4.setText(""+rs.getInt("SUB1"));
l5.setText(""+rs.getInt("SUB2"));
l6.setText(""+rs.getInt("SUB3"));
l7.setText(""+rs.getInt("SUB4"));
l8.setText(""+rs.getInt("SUB5"));

a1.add(l1);
a1.add(l2);

a2.add(l3);

a3.add(l4);
a3.add(l5);
a3.add(l6);
a3.add(l7);
a3.add(l8);

add(p1);
add(a1);

add(p2);
add(a2);

add(p3);
add(a3);
show();
}
}
catch(ClassNotFoundException se)
{

tf_entername.setText("Error : " + se.toString());
}

catch(SQLException se)
{
tf_entername.setText("Error : " + se.toString());
}
}

public void windowClosed(WindowEvent we){}
public void windowDeiconified(WindowEvent we){}
public void windowIconified(WindowEvent we){}
public void windowActivated(WindowEvent we){}
public void windowDeactivated(WindowEvent we){}
public void windowOpened(WindowEvent we){}

public void windowClosing(WindowEvent we)
{
while(x>0 && y>0)
{
setSize(x,y);
x=x-d;
y=y-d;
show();
}
dispose();

}
}

//class which help in storing records in the database
class student extends Frame implements ActionListener,WindowListener

{
public static student st;
TextField tf_name=new TextField(20);
TextField tf_rollno=new TextField(20);
TextField tf_colg=new TextField(20);
TextField tf_marks=new TextField(20);
TextField tf_sub1=new TextField(4);
TextField tf_sub2=new TextField(4);
TextField tf_sub3=new TextField(4);
TextField tf_sub4=new TextField(4);
TextField tf_sub5=new TextField(4);

Label l2=new Label("ROLLNO");
Label l1=new Label("NAME");
Label l3=new Label("MARKS");
Label l4=new Label("COLG");
Label l5=new Label("MARK SHEET");
Label l6=new Label("SUB1");
Label l7=new Label("SUB2");
Label l8=new Label("SUB3");
Label l9=new Label("SUB4");
Label l10=new Label("SUB5");
Button but_add=new Button("ADD");
Button but_edit=new Button("EDIT");
Button but_find=new Button("FIND");
Button but_delete=new Button("DELETE");
Button but_cancel=new Button("CANCEL");
Button ok=new Button("OK");
Dialog dlg;
Label msg;
int x,y,d;

public student()
{
super("palce");
addWindowListener(this);
setLayout(new GridLayout(6,1));
setBackground(Color.yellow);
setVisible(true);
addmenu();
x=550;
y=450;
d=12;
setSize(x,y);
show();
}

void addmenu()
{
//GridLayout gl=new GridLayout();
Panel p1=new Panel();
p1.add(l1);
p1.add(tf_name);

p1.add(l2);
p1.add(tf_rollno);

Panel p2=new Panel();
p2.add(l5);
Panel p3=new Panel();
p3.add(but_add);
p3.add(but_find);
p3.add(but_cancel);
p3.add(but_edit);
p3.add(but_delete);

Panel p4=new Panel();
//p4.add(l3);
p4.add(l6);
p4.add(l7);
p4.add(l8);
p4.add(l9);
p4.add(l10);

Panel p8=new Panel();
p8.add(tf_sub1);
p8.add(tf_sub2);
p8.add(tf_sub3);
p8.add(tf_sub4);
p8.add(tf_sub5);

Panel p5=new Panel();
p5.add(l4);
p5.add(tf_colg);

add(p2);
add(p1);
add(p5);
add(p4);
add(p8);
add(p3);
but_add.addActionListener(this);
but_cancel.addActionListener(this);
but_find.addActionListener(this);
but_delete.addActionListener(this);
but_edit.addActionListener(this);
ok.addActionListener(this);
//Dialog for confirmation

dlg=new Dialog(this,"Inventory Management System",false);
dlg.setLayout(new GridLayout(2,1));
dlg.setSize(100,100);
dlg.setLocation(200,100);
ok.setSize(50,50);
msg=new Label("Record Updated");
dlg.add(msg);
dlg.add(ok);

}
public void actionPerformed(ActionEvent e)
{
String arg=e.getActionCommand();
//ADDBUTTON
if(e.getSource() instanceof Button)
if("ADD".equals(arg))
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:stu","","");
Statement st;

String sqlStr;
sqlStr="insert into
stu1(NAME,ROLLNO,COLG,SUB1,SUB2,SUB3,SUB4,SUB5)values('"+tf_name.getText()
+"',"+tf_rollno.getText()+",'"+tf_colg.getText()+"',"+tf_sub1.getText()+",
+tf_sub2.getText()+"," +tf_sub3.getText()+","+tf_sub4.getText()+","+tf_sub
5.getText()+")";
st=con.createStatement();
st.executeUpdate(sqlStr);
}
catch(ClassNotFoundException se)
{
// tf_name.setText("Error : " + se.toString());
msg.setText("ERROR");
dlg.show();
}
catch(SQLException se)
{
// tf_name.setText("Error : " + se.toString());
msg.setText("ENTER TEXTFIELD");
dlg.show();
}

//OK button

if ( e.getSource() instanceof Button)
if ("OK".equals(arg))
{ dlg.dispose();
}
//CANCEL
if(e.getSource() instanceof Button)
if("CANCEL".equals(arg))

{
tf_name.setText("");
tf_rollno.setText("");
tf_colg.setText("");
tf_sub1.setText("");
tf_sub2.setText("");
tf_sub3.setText("");
tf_sub4.setText("");
tf_sub5.setText("");
}
//FIND
if(e.getSource() instanceof Button)
if("FIND".equals(arg))
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:stu","","");
Statement st;
String sqlstr;
sqlstr="select * from stu1 where ROLLNO ="+tf_rollno.getText()+"";
st=con.createStatement();
ResultSet rs;
rs=st.executeQuery(sqlstr);
rs.next();
tf_name.setText(""+rs.getString("NAME"));
tf_colg.setText(""+rs.getString("COLG"));
tf_sub1.setText(""+rs.getInt("SUB1"));
tf_sub2.setText(""+rs.getInt("SUB2"));
tf_sub3.setText(""+rs.getInt("SUB3"));
tf_sub4.setText(""+rs.getInt("SUB4"));
tf_sub5.setText(""+rs.getInt("SUB5"));
}
catch(ClassNotFoundException se)
{
msg.setText("RECORD NOT FOUND");
dlg.show();

// tf_name.setText("Error : " + se.toString());
}
catch(SQLException se)
{
msg.setText("RECORD NOT FOUND");
dlg.show();
//tf_name.setText("Error : " + se.toString());
}
//DELETE
if(e.getSource() instanceof Button)
if("DELETE".equals(arg))
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:stu","","");
Statement st;
String sqlstr;
sqlstr="delete * from stu1 where ROLLNO="+tf_rollno.getText()+"";
st=con.createStatement();
st.executeUpdate(sqlstr);
tf_name.setText("");
tf_colg.setText("");
tf_sub1.setText("");
tf_sub2.setText("");
tf_sub3.setText("");
tf_sub4.setText("");
tf_sub5.setText("");

tf_rollno.setText("");
msg.setText("RECORD DELETED");
dlg.show();

}
catch(ClassNotFoundException se)
{
tf_name.setText("Error : " + se.toString());
}
catch(SQLException se)
{
tf_name.setText("Error : " + se.toString());
}

//EDIT
if(e.getSource() instanceof Button)
if("EDIT".equals(arg))
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:stu","","");
Statement st;
String sqlstr;
sqlstr="update stu1 set
NAME='"+tf_name.getText()+"',SUB1="+tf_sub1.getText()+",SUB2="+tf_sub2.get
Text()+",SUB3="+tf_sub3.getText()+",SUB4="+tf_sub4.getText()+",SUB5="+tf_s
ub5.getText()+",COLG='"+tf_colg.getText()+"' where
ROLLNO="+tf_rollno.getText();
st=con.createStatement();
st.executeUpdate(sqlstr);
msg.setText("RECORD UPDATED");
dlg.show();
}
catch(ClassNotFoundException se)
{

tf_name.setText("Error : " + se.toString());
}
catch(SQLException se)
{

tf_name.setText("Error : " + se.toString());
}
}
public void windowClosed(WindowEvent we){}
public void windowDeiconified(WindowEvent we){}
public void windowIconified(WindowEvent we){}
public void windowActivated(WindowEvent we){}
public void windowDeactivated(WindowEvent we){}
public void windowOpened(WindowEvent we){}
public void windowClosing(WindowEvent we)
{
while(x>0 && y>0)
{
setSize(x,y);
x=x-d;
y=y-d;
show();
}
dispose();
}

}

Project of Employee payroll managemnt system In Java

2010-04-05T09:38:00.000-07:00

import java.io.*;
import java.awt.*;
import java.awt.Color.*;
import java.awt.event.*;
import java.applet.*;

/**/

public class train2 extends Applet implements
ActionListener,ItemListener

{
Label name,amount,seats,number;
TextField na,am,sts,nr;
TextArea t;
Choice css;

Checkbox si,sr;
CheckboxGroup g;

Button b,cancel;
int s,c,d;
int n1=400;
int n2=250;
int n3=100;

public void init()
{
setBackground(Color.yellow);
setForeground(Color.red);
setLayout(new FlowLayout());

na=new TextField(20);
am=new TextField(20);
sts=new TextField(20);
nr=new TextField(20);

name=new Label("NAME");
amount=new Label("AMOUNT");
seats=new Label("SEATS");
number=new Label("REQUIRED NO OF SEATS");

css=new Choice();
css.add("A.C SLEEPER");
css.add("FIRST CLASS");
css.add("SECOND CLASS");

t=new TextArea(40,45);

g=new CheckboxGroup();
si=new Checkbox("SATAPTI",g,false);
sr=new Checkbox("SABARI",g,false);

b=new Button("SUBMIT");
cancel=new Button("CANCEL");

add(name);
add(na);

add(seats);
add(sts);

add(number);
add(nr);

add(si);
add(sr);

add(css);

add(b);

add(amount);
add(am);

add(t);
add(cancel);

css.addItemListener(this);
b.addActionListener(this);
si.addItemListener (this);
sr.addItemListener (this);

}
public void actionPerformed(ActionEvent ae)
{

if(b.getActionCommand().equals("SUBMIT"))
{
d=Integer.parseInt(nr.getText());
s=(Integer.parseInt(sts.getText()))-d;

if(css.getSelectedItem().equals("A.C SLEEPER"))
{
am.setText("400");
}
else if(css.getSelectedItem().equals("FIRST CLASS"))
{
am.setText("250");
}
else
{
am.setText("100");
}

}

c=((Integer.parseInt(am.getText()))*(Integer.parseInt(nr.getText())));
t.setText("NAME:"+na.getText()+"
+"After reservation total no.of
seats are:"
+s+"
+"Train name
:"+g.getSelectedCheckbox().getLabel()+"
+"Class:"+
css.getSelectedItem()+ "Total number of Rs :"+c);

if(cancel.getActionCommand().equals("CANCEL"))
{
repaint();
}

}

public void itemStateChanged(ItemEvent ie)
{

}

}

import java.io.*;
import java.awt.*;
import java.awt.Color.*;
import java.awt.event.*;
import java.applet.*;

/**/

public class train2 extends Applet implements
ActionListener,ItemListener

{
Label name,amount,seats,number;
TextField na,am,sts,nr;
TextArea t;
Choice css;

Checkbox si,sr;
CheckboxGroup g;

Button b,cancel;
int s,c,d;
int n1=400;
int n2=250;
int n3=100;

public void init()
{
setBackground(Color.yellow);
setForeground(Color.red);
setLayout(new FlowLayout());

na=new TextField(20);
am=new TextField(20);
sts=new TextField(20);
nr=new TextField(20);

name=new Label("NAME");
amount=new Label("AMOUNT");
seats=new Label("SEATS");
number=new Label("REQUIRED NO OF SEATS");

css=new Choice();
css.add("A.C SLEEPER");
css.add("FIRST CLASS");
css.add("SECOND CLASS");

t=new TextArea(40,45);

g=new CheckboxGroup();
si=new Checkbox("SATAPTI",g,false);
sr=new Checkbox("SABARI",g,false);

b=new Button("SUBMIT");
cancel=new Button("CANCEL");

add(name);
add(na);

add(seats);
add(sts);

add(number);
add(nr);

add(si);
add(sr);

add(css);

add(b);

add(amount);
add(am);

add(t);
add(cancel);

css.addItemListener(this);
b.addActionListener(this);
si.addItemListener (this);
sr.addItemListener (this);

}
public void actionPerformed(ActionEvent ae)
{

if(b.getActionCommand().equals("SUBMIT"))
{
d=Integer.parseInt(nr.getText());
s=(Integer.parseInt(sts.getText()))-d;

if(css.getSelectedItem().equals("A.C SLEEPER"))
{
am.setText("400");
}
else if(css.getSelectedItem().equals("FIRST CLASS"))
{
am.setText("250");
}
else
{
am.setText("100");
}

}

c=((Integer.parseInt(am.getText()))*(Integer.parseInt(nr.getText())));
t.setText("NAME:"+na.getText()+"
+"After reservation total no.of
seats are:"
+s+"
+"Train name
:"+g.getSelectedCheckbox().getLabel()+"
+"Class:"+
css.getSelectedItem()+ "Total number of Rs :"+c);

if(cancel.getActionCommand().equals("CANCEL"))
{
repaint();
}
}
public void itemStateChanged(ItemEvent ie)