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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. 	static void fillData(char[][] iArray)
  11. 	{
  12. 		final int SIZE = iArray[0].length;
  13. 		char cChar = 'a';
  14. 		for(int i=0; i<SIZE; i++)
  15. 		{
  16. 			for(int j=0; j<SIZE; j++)
  17. 			{
  18. 				iArray[i][j] = cChar++;
  19. 			}
  20. 		}
  21. 	}
  22. 	static void display(char[][] iArray)
  23. 	{
  24. 		final int SIZE = iArray[0].length;
  25. 		for(int i=0; i<SIZE; i++)
  26. 		{
  27. 			for(int j=0; j<SIZE; j++)
  28. 			{
  29. 				System.out.print(iArray[i][j] + " | ");
  30. 			}
  31. 			System.out.println();
  32. 		}
  33. 	}
  34.  
  35. 	/*
  36. 	//Old version
  37. 	static void reverseDiagonal(char[][] iArray)
  38. 	{
  39. 		final int SIZE = iArray[0].length;
  40. 		for(int i=0; i< SIZE/2; i++)
  41. 		{
  42. 			char tTemp = iArray[i][i];
  43. 			iArray[i][i] = iArray[SIZE-i-1][SIZE-i-1];
  44. 			iArray[SIZE-i-1][SIZE-i-1] = tTemp;
  45.  
  46. 			tTemp = iArray[i][SIZE-i-1];
  47. 			iArray[i][SIZE-i-1] = iArray[SIZE-i-1][i];
  48. 			iArray[SIZE-i-1][i] = tTemp;
  49. 		}
  50.  
  51. 	}*/
  52.  
  53. 	// New version
  54. 	static void reverseDiagonal(char[][] iArray)
  55. 	{
  56. 		final int SIZE = iArray[0].length;
  57.         final int len = SIZE/2;
  58. 		for(int i=0; i< len; i++)
  59. 		{
  60.             final int j = i+1;
  61. 			char tTemp = iArray[i][i];
  62. 			iArray[i][i] = iArray[SIZE-j][SIZE-j];
  63. 			iArray[SIZE-j][SIZE-j] = tTemp;
  64.  
  65. 			tTemp = iArray[i][SIZE-j];
  66. 			iArray[i][SIZE-j] = iArray[SIZE-j][i];
  67. 			iArray[SIZE-j][i] = tTemp;
  68. 		}
  69. 	}
  70.  
  71. 	public static void main (String[] args) throws java.lang.Exception
  72. 	{
  73. 		final int SIZE = 4;
  74. 		char[][] iArray = new char[SIZE][SIZE];
  75.  
  76. 		fillData(iArray);
  77. 		display(iArray);
  78.  
  79. 		System.out.println('\n');
  80.  
  81. 		reverseDiagonal(iArray);
  82. 		display(iArray);
  83.  
  84. 	}
  85. }
Success #stdin #stdout 0.09s 33876KB
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stdin
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Standard input is empty
stdout
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a | b | c | d | 
e | f | g | h | 
i | j | k | l | 
m | n | o | p | 


p | b | c | m | 
e | k | j | h | 
i | g | f | l | 
d | n | o | a |
https://ideone.com/FFMyus
https://stackoverflow.com/questions/47746807/reversing-diagonal-in-a-matrix-in-java
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
secret

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