Display.java

import greenfoot.*;

/**
 * The Display class, to display instructions to the player when they first start the game.
 * 
 * @author Matthew Hillier
 * @version 1.0
 */
public class Display extends Overworld
{
 Integer displayNum = 0;

 /**
 * Simply displays the instruction screen.
 */
 public Display()
 {
 setImage("Help.png");
 }

 /**
 * Counts up, and then removes itself.
 */
 public void act() 
 {
 if(displayNum < 40)
 {
 Greenfoot.delay(1);
 displayNum++;
 }
 else
 {
 getWorld().removeObject(this);
 }
 }
}