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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.  
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 	  final Thread thread = new Thread(new MatrixRunner());
  14. 	  thread.run();
  15. 	}
  16.  
  17.     //this setup allows for the dropping of the static context beyond 'this' point of execution
  18.     private static class MatrixRunner implements Runnable {
  19.     	public void run() {
  20.     		final Matrix matrix = new Matrix(3);
  21. 	        System.out.printf("Matrix : %s\n", matrix);
  22. 	        matrix.transpose();
  23. 	        System.out.printf("After transpose : %s\n", matrix);
  24.     	}
  25.  
  26.     //notice this class does not have static modifier
  27.     private class Matrix {
  28.       private final double[][] matrix;
  29.       private final int size;
  30.       public Matrix(final int size) {
  31.     	this.size = size;
  32.     	matrix = new double[size][size];
  33.  
  34.         //populate with dummy data...omitted the 0 as they are assigned by default
  35.         matrix[0][0]=1;
  36.         matrix[1][0]=5;
  37.         matrix[1][1]=1;
  38.         matrix[2][0]=6;
  39.         matrix[2][1]=5;
  40.         matrix[2][2]=1;
  41.  
  42.     }
  43.  
  44.     public void transpose() {
  45.       for(int i = 0; i < size; ++i) {
  46.           for(int j = 0; j < i ; ++j) {
  47.               double tmpJI = get(j, i);
  48.               put(j, i, get(i, j));
  49.               put(i, j, tmpJI);
  50.           }
  51.       }
  52.     }
  53.  
  54.     public String toString() {
  55.         System.out.println();
  56. 		final StringBuilder sb = new StringBuilder();
  57.         for(int i = 0; i < size; ++i) {
  58.             for(int j = 0; j < size ; ++j) {
  59.                 sb.append((int)get(i,j));
  60.                 sb.append(" ");
  61.             }
  62.             sb.append("\n");
  63.         }
  64.     return sb.toString();
  65.     }
  66.  
  67.     public void put(int i, int j, double d) {
  68.  
  69.         matrix[i][j]=d;
  70.     }
  71.  
  72.     public double get(int i, int j) {
  73.  
  74.         return matrix[i][j];
  75.     }
  76. }
  77. }
  78.  
  79. }
Success #stdin #stdout 0.08s 380224KB
comments (?)
stdin 
Standard input is empty
stdout 
Matrix : 
1 0 0 
5 1 0 
6 5 1 

After transpose : 
1 5 6 
0 1 5 
0 0 1
https://ideone.com/a5KmQ3
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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