Java Tutor...: 2012

Java Program prints ip address

Java Program prints ip address | IP address Printing using Java




import java.net.InetAddress;
 
class IPAddress
{
   public static void main(String args[]) throws Exception
   {
      System.out.println(InetAddress.getLocalHost());
   }
}

Reverse number in Java || Java Reverse Given Number

import java.util.Scanner;   class ReverseNumber {    public static void main(String args[])    {       int n, reverse = 0;         System.out.println("Enter the number to reverse");       Scanner in = new Scanner(System.in);       n = in.nextInt();         while( n != 0 )       {           reverse = reverse * 10;           reverse = reverse + n%10;           n = n/10;       }         System.out.println("Reverse of entered number is "+reverse);    } }

add two matrices using Java | Addition of two matrices in Java

import java.util.Scanner;   class AddTwoMatrix {    public static void main(String args[])    {       int m, n, c, d;       Scanner in = new Scanner(System.in);         System.out.println("Enter the number of rows and columns of matrix");       m = in.nextInt();       n = in.nextInt();         int first[][] = new int[m][n];       int second[][] = new int[m][n];       int sum[][] = new int[m][n];         System.out.println("Enter the elements of first matrix");         for (  c = 0 ; c < m ; c++ )          for ( d = 0 ; d < n ; d++ )             first[c][d] = in.nextInt();         System.out.println("Enter the elements of second matrix");         for ( c = 0 ; c < m ; c++ )          for ( d = 0 ; d < n ; d++ )             second[c][d] = in.nextInt();         for ( c = 0 ; c < m ; c++ )          for ( d = 0 ; d < n ; d++ )              sum[c][d] = first[c][d]+ second[c][d];         System.out.println("Sum of entered matrices:-");         for ( c = 0 ; c < m ; c++ )       {          for ( d = 0 ; d < n ; d++ )             System.out.print(sum[c][d]+"\t");            System.out.println();       }    } }

transpose matrix Program in Java | transpose matrix JAVA, Core Java transpose matrix Assignment

import java.util.Scanner;

class TransposeAMatrix
{
  public static void main(String args[])
  {
     int m, n, c, d;

     Scanner in = new Scanner(System.in);
     System.out.println("Enter the number of rows and columns of matrix");
     m = in.nextInt();
     n = in.nextInt();

     int matrix[][] = new int[m][n];

     System.out.println("Enter the elements of matrix");

     for ( c = 0 ; c < m ; c++ )          for ( d = 0 ; d < n ; d++ )             matrix[c][d] = in.nextInt();         int transpose[][] = new int[n][m];         for ( c = 0 ; c < m ; c++ )       {          for ( d = 0 ; d < n ; d++ )                            transpose[d][c] = matrix[c][d];                  }         System.out.println("Transpose of entered matrix:-");         for ( c = 0 ; c < n ; c++ )       {          for ( d = 0 ; d < m ; d++ )                System.out.print(transpose[c][d]+"\t");               System.out.print("\n");       }    } }

java program multiply two matrices



import java.util.Scanner;
 
class MatrixMultiplication
{
   public static void main(String args[])
   {
      int m, n, p, q, sum = 0, c, d, k;
 
      Scanner in = new Scanner(System.in);
      System.out.println("Enter the number of rows and columns of first matrix");
      m = in.nextInt();
      n = in.nextInt();
 
      int first[][] = new int[m][n];
 
      System.out.println("Enter the elements of first matrix");
 
      for ( c = 0 ; c < m ; c++ )
         for ( d = 0 ; d < n ; d++ )
            first[c][d] = in.nextInt();
 
      System.out.println("Enter the number of rows and columns of second matrix");
      p = in.nextInt();
      q = in.nextInt();
 
      if ( n != p )
         System.out.println("Matrices with entered orders can't be multiplied with each other.");
      else
      {
         int second[][] = new int[p][q];
         int multiply[][] = new int[m][q];
 
         System.out.println("Enter the elements of second matrix");
 
         for ( c = 0 ; c < p ; c++ )
            for ( d = 0 ; d < q ; d++ )
               second[c][d] = in.nextInt();
 
         for ( c = 0 ; c < m ; c++ )
         {
            for ( d = 0 ; d < n ; d++ )
            {   
               for ( k = 0 ; k < p ; k++ )
               {
                  sum = sum + first[c][k]*second[k][d];
               }
 
               multiply[c][d] = sum;
               sum = 0;
            }
         }
 
         System.out.println("Product of entered matrices:-");
 
         for ( c = 0 ; c < m ; c++ )
         {
            for ( d = 0 ; d < q ; d++ )
               System.out.print(multiply[c][d]+"\t");
 
            System.out.print("\n");
         }
      }
   }
}

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

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

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

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

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

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

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

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

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');
}
}

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