public class Fish extends Animal
{
   int speed = 0; //Starting speed of the fish
   final int MAX_SPEED = 1; //Max speed the fish can go
   final int DELAY = 1; //The delay of the fish's speed

   
   /** 
   *Act - the Fish hunts for flies in the water world.
   *This 'Act' or 'Run' button gets pressed in the environment.
   */
   public void act()
   {
       lookForFly(); //look for the Fly method
       keys(); //The Keys method
   }
    /**
    * Check whether a control key on the keyboard has been pressed.
    * If it has, react accordingly.
    */
   public void keys()
   {
       if(Greenfoot.isKeyDown("right")) //Moves fish right
       {
           if(getIntersectingObjects(Rock.class).isEmpty())
           {
               turn(3); //Location of the fish in the World
           }
       }
       if(Greenfoot.isKeyDown("left")) //Moves fish left
       {
           if(getIntersectingObjects(Rock.class).isEmpty())
           {
               turn(-3); //Location of the fish in the World
           }
       }
       if (Greenfoot.isKeyDown("up") && speed > -MAX_SPEED * DELAY) //Moves the fish up with different speeds
       {
           if(getIntersectingObjects(Rock.class).isEmpty())
           {
               move(speed++); //Creates the different speeds of the fish
           }
       }
       if (Greenfoot.isKeyDown("down") && speed > -MAX_SPEED * DELAY)  //Moves the fish down with different speeds
       {
           if(getIntersectingObjects(Rock.class).isEmpty())
           {
               move(speed--); //Creates the different speeds of the fish
           }
       }
   }
   /**
   * Check whether the fish has stumbled upon a Fly.
   * If it have, eat it. If not, do nothing.
   */
   public void lookForFly()
   {
       if (canSee(Fly.class)) //can the Fish see the Fly
       {
           eat(Fly.class); //if Fly is found, then crab eats it
           Greenfoot.playSound("slurp.wav"); // .wav file is played when Fly is eaten
       }
   }