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  1. /* package whatever; // don't place package name! */
  2.  
  3. /* The class name doesn't have to be Main, as long as the class is not public. */
  4. class Main
  5. {
  6.   public static void main (String[] args) throws java.lang.Exception
  7.   {
  8.      new Main().test2();
  9.   }
  10.  
  11.     void test2() {
  12.  
  13.         final int grayCodeLength = 4;
  14.  
  15.         // generate matrix
  16.         final int grayCodeCount = 1 << grayCodeLength; // = 2 ^ grayCodeLength
  17.         int grayCodeMatrix[][] = new int[grayCodeCount][grayCodeLength];
  18.         for (int i = 0; i < grayCodeCount; i++) {
  19.             int grayCode = (i >> 1) ^ i;
  20.             for (int j =0;  j <grayCodeLength; j++) {
  21.                 // extract bit
  22.                 final int grayCodeBitMask = 1 << j;
  23.                 grayCodeMatrix[i][j] =  (grayCode & grayCodeBitMask) >> j;
  24.             }
  25.         }
  26.  
  27.         // view result
  28.         for (int y = 0; y < grayCodeMatrix.length; y++) {
  29.             for (int x = 0; x < grayCodeMatrix[0].length; x++) {
  30.                 System.out.print(grayCodeMatrix[y][x]);
  31.             }
  32.             System.out.print("\n");
  33.         }
  34.  
  35.  
  36.  
  37.     }
  38. }
Success #stdin #stdout 0.07s 380224KB
comments (?)
stdin 
Standard input is empty
stdout 
0000
1000
1100
0100
0110
1110
1010
0010
0011
1011
1111
0111
0101
1101
1001
0001
https://ideone.com/n5F6PA
language:
Java (12.0.1)
created:
12 years ago
visibility:
public

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