1  public class Bug

  2  {

  3     private int row;

  4     private int column;

  5     private int direction; // 0 = North, 1 = East, 2 = South, 3 = West

  6     

  7     public void moveOneUnit()

  8     {

  9        final int NORTH = 0;

 10        final int EAST = 1;

 11        final int SOUTH = 2;

 12        final int WEST = 3;

 13        

 14        if (direction == NORTH) { row--; }

 15        else if (direction == EAST) { column++; }

 16        else if (direction == SOUTH) { row++; }

 17        else if (direction == WEST) { column--; }

 18     }

 19  

 20     public void turnRight() 

 21     {

 22        int DIRECTIONS = 4;

 23  

 24        direction++;

 25        if (direction == DIRECTIONS) { direction = 0; }

 26     }

 27  

 28     public int getRow() { return row; }

 29     public int getColumn() { return column; }

 30  }