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  1. import java.util.Arrays;
  2.  
  3. public class Main {
  4.  
  5. public static void main(String[] args) {
  6.         /*
  7.         System.out.println("Hello World!");
  8.         int[] a = {5, 4, 3, 2, 1};
  9.         mergeSort(a);
  10.         */
  11.  
  12.         int[][] stuff = {
  13.                 {1, 2, 3},
  14.                 {4, 5, 6},
  15.                 {7, 8, 9}
  16.         };
  17.  
  18.         System.out.println("Initial state of array:");
  19.         for (int row = 0; row < stuff.length; row++) {
  20.             System.out.println(Arrays.toString(stuff[row]));
  21.         }
  22.         System.out.println(' ');
  23.  
  24.  
  25.         flipHorizontal(stuff);
  26.         System.out.println("Horizontally flipped:");
  27.         for (int row = 0; row < stuff.length; row++) {
  28.             System.out.println(Arrays.toString(stuff[row]));
  29.         }
  30.         System.out.println(' ');
  31.  
  32.         flipVertical(stuff);
  33.         System.out.println("Vertically flipped:");
  34.         for (int row = 0; row < stuff.length; row++) {
  35.             System.out.println(Arrays.toString(stuff[row]));
  36.         }
  37.  
  38.     }
  39.  
  40.     // Swap left/right
  41.     public static void flipHorizontal(int[][] arrayToFlip) {
  42.         int columnIndexToStopAt = arrayToFlip[0].length / 2;
  43.  
  44.         for (int currentRowIndex = 0; currentRowIndex < arrayToFlip.length; currentRowIndex++) {
  45.             for (int currentColumnIndex = 0; currentColumnIndex < columnIndexToStopAt; currentColumnIndex++) {
  46.  
  47.                 int lastColumnIndex = arrayToFlip[0].length - 1;
  48.                 int oppositeColumnIndex = lastColumnIndex - currentColumnIndex;
  49.  
  50.                 int temp = arrayToFlip[currentRowIndex][currentColumnIndex];
  51.  
  52.                 arrayToFlip[currentRowIndex][currentColumnIndex] = arrayToFlip[currentRowIndex][oppositeColumnIndex];
  53.                 arrayToFlip[currentRowIndex][oppositeColumnIndex] = temp;
  54.  
  55.             }
  56.         }
  57.     }
  58.  
  59.     // Swap top/bottom
  60.     public static void flipVertical(int[][] arrayToFlip) {
  61.         int rowIndexToStopAt = arrayToFlip.length / 2;
  62.  
  63.         for (int currentRowIndex = 0; currentRowIndex < rowIndexToStopAt; currentRowIndex++) {
  64.             for (int currentColumnIndex = 0; currentColumnIndex < arrayToFlip[0].length; currentColumnIndex++) {
  65.  
  66.                 int lastRowIndex = arrayToFlip.length - 1;
  67.                 int oppositeRowIndex = lastRowIndex - currentRowIndex;
  68.  
  69.                 int temp = arrayToFlip[currentRowIndex][currentColumnIndex];
  70.  
  71.                 arrayToFlip[currentRowIndex][currentColumnIndex] = arrayToFlip[oppositeRowIndex][currentColumnIndex];
  72.                 arrayToFlip[oppositeRowIndex][currentColumnIndex] = temp;
  73.  
  74.             }
  75.         }
  76.     }
  77.  
  78. }
  79.  
Success #stdin #stdout 0.04s 711168KB
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stdin
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Standard input is empty
stdout
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Initial state of array:
[1, 2, 3]
[4, 5, 6]
[7, 8, 9]
 
Horizontally flipped:
[3, 2, 1]
[6, 5, 4]
[9, 8, 7]
 
Vertically flipped:
[9, 8, 7]
[6, 5, 4]
[3, 2, 1]
https://ideone.com/lahL4k
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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