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Crab Scenario Animation

/ Published in: Java
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I had a subtle mistake in my code that was causing the exception. The corrected source code is below:

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  1. import greenfoot.*;  // (World, Actor, GreenfootImage, and Greenfoot)
  2.  
  3. /**
  4.  * This class defines a crab. Crabs live on the beach.
  5.  */
  6. public class Crab extends Animal
  7. {
  8.     private final int MAX_TURN_DEGREES = 25;    
  9.     private final int ANIMATION_FRAMES = 2;
  10.     private int animationCounter = 0;
  11.     private GreenfootImage[] images;
  12.  
  13.     public Crab()
  14.     {
  15.         images = new GreenfootImage[ANIMATION_FRAMES];
  16.  
  17.         for( int i = 1; i <= ANIMATION_FRAMES; i++ )
  18.         {
  19.             images[i-1] = new GreenfootImage( "crab" + i + ".png" );
  20.         }
  21.         setImage( images[animationCounter] );
  22.         animationCounter++;
  23.     }
  24.  
  25.     public void animate()
  26.     {
  27.         animationCounter = animationCounter % ANIMATION_FRAMES;
  28.         setImage( images[animationCounter] );
  29.         animationCounter++;
  30.     }
  31.  
  32.     public void turnAtEdge()
  33.     {
  34.         if( atWorldEdge() )
  35.         {
  36.             turn(17);
  37.         }
  38.     }
  39.  
  40.     public void randomTurn()
  41.     {
  42.         if( Greenfoot.getRandomNumber(100) < 15 )
  43.         {
  44.             int directionToTurn = Greenfoot.getRandomNumber(3) - 1; // left, right, or no turn
  45.             turn( directionToTurn * Greenfoot.getRandomNumber(MAX_TURN_DEGREES) );
  46.         }
  47.     }
  48.  
  49.     public void lookForWorm()
  50.     {
  51.         if( canSee( Worm.class ) )
  52.         {
  53.             eat( Worm.class );
  54.             Greenfoot.playSound("slurp.wav");
  55.         }
  56.     }
  57.  
  58.     public void checkKeyPress()
  59.     {
  60.         if( Greenfoot.isKeyDown( "left" ) )
  61.         {
  62.             turn( -4 );
  63.         }
  64.         if( Greenfoot.isKeyDown( "right" ) )
  65.         {
  66.             turn( 4 );
  67.         }
  68.     }
  69.  
  70.     public void act()
  71.     {
  72.         checkKeyPress();
  73.         move();
  74.         animate();
  75.         lookForWorm();
  76.     }
  77. }

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