Zombies?

So i'm trying to get it so when the server start a zombie will spawn but when killed it will re spawn after time.

here code:

Code:java

 ArrayList<Integer> zombies = new ArrayList<Integer>();
 
@EventHandler(priority=EventPriority.NORMAL)
public void onEntityDeathEvent(EntityDeathEvent e){
final Entity en = e.getEntity();
if(en instanceof Zombie){
new BukkitRunnable(){
@Override
public void run() {
if(zombies.contains(en.getEntityId())){
Bukkit.broadcastMessage("hey"); //debug message.
}else{
Location zom1 = new Location(en.getWorld(), 3, 44, 14);
Zombie z = (Zombie) zom1.getWorld().spawn(zom1, Zombie.class);
z.setCustomName(ChatColor.RED + "Zombie");
z.setCustomNameVisible(true);
zombies.add(z.getEntityId());
}
}
}.runTaskLater(this.plugin, 10);
}
}

and plus can you do multiple ones?

 

Wantsome909
So what is wrong?

 

Rockon999 well, i have to kill a zombie to make a zombie spawn. So how could i make a zombie spawn with out killing another zombie?

 

Wantsome909
Try spawning one in your onEnable?