import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Bullet here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Bullet extends Actor
{

    /**
     * Act - do whatever the Bullet wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public Bullet()
    {

    }

    public void act() {
        move(6);
        if (isAtEdge() || collidesWithZombie()) {
            getWorld().removeObject(this);
        }
        collidesWithZombie();
        System.out.println("Bullet removed from hitting "+(isAtEdge() ? "edge" : "zombie")+".");
    }

    private void updateHealth()
    {

    }

    private boolean collidesWithZombie() {
        if( ! isTouching(Zombies.class)) return false;
        { Greenfoot.playSound("Gunshot.mp3");
            removeTouching(Zombies.class);
            Counter counter = (Counter) getWorld().getObjects(Counter.class).get(0);
            counter.add(1);
            return true;
        }
    }

    private void repeat()
    {

    }
}

import greenfoot.*; //(Mythic2,Explorer)  // (World,Explorer, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Mythic2 here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Mythic2 extends World
{
    private Healthbar healthbar = new Healthbar();
    long lastAdded = System.currentTimeMillis();
    private Counter counter = new Counter();

    /**
     * Constructor for objects of class Mythic2.
     * 
     */
    public Mythic2()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1); 
        prepare();
        spawn();
        updateHealth();
    }

    public void updateHealth()
    {
        if (healthbar.getHealth()<=0)
        {
            setBackground("gameover.png");
            Greenfoot.stop();
        }
    }

    private void prepare() 
    {
        Explorer Explorer = new Explorer();
        addObject(Explorer, 86, 206);

    }

    public Healthbar getHealthBar()
    {
        return healthbar;
    }
    public void spawn()
    {

        Zombies Zombies = new Zombies();
        addObject(new Zombies(), 515, 205);
        Counter Counter = new Counter();
        addObject(Counter, 50, 41);
        Healthbar Healthbar = new Healthbar();
        addObject(Healthbar, 530, 33);
    }

    public void removeObject(Actor actor)
    {
        super.removeObject(actor);
        if (actor instanceof Zombies) 
        addObject(new Zombies(), 515, 205);
    }

}