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  1. public class Main {
  2.  
  3.     private static final int NORTH = 0x11111111; // 0001 0001 0001 ...
  4.     private static final int EAST = 0x22222222; // 0010 0010 ...
  5.     private static final int SOUTH = 0x44444444; // 0100 0100 ...
  6.     private static final int WEST = 0x88888888; // 1000 1000 ...
  7.  
  8.     static int leftOf(int direction) {
  9.         return Integer.rotateLeft(direction, 1);
  10.     }
  11.  
  12.     static int rightOf(int direction) {
  13.         return Integer.rotateRight(direction, 1);
  14.     }
  15.  
  16.     static String getName(int dir) {
  17.         switch (dir) {
  18.             case NORTH:
  19.                 return "North";
  20.             case EAST:
  21.                 return "East";
  22.             case SOUTH:
  23.                 return "South";
  24.             case WEST:
  25.                 return "West";
  26.             default:
  27.                 return "Error";
  28.         }
  29.     }
  30.  
  31.     static final int[] TESTCASES = {
  32.             NORTH,
  33.             EAST,
  34.             SOUTH,
  35.             WEST
  36.     };
  37.  
  38.     public static void main(String[] args) {
  39.         for (int test : TESTCASES) {
  40.             System.out.printf("left: %5s   self: %5s   right:%5s%n",
  41.                     getName(leftOf(test)),
  42.                     getName(test),
  43.                     getName(rightOf(test))
  44.                     );
  45.         }
  46.     }
  47.  
  48. }
Success #stdin #stdout 0.07s 380224KB
comments (?)
stdin 
Standard input is empty
stdout 
left:  East   self: North   right: West
left: South   self:  East   right:North
left:  West   self: South   right: East
left: North   self:  West   right:South
https://ideone.com/htgs2A
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
secret

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