Preventing spawn?

As there is an event in Minecraft named CREATURE_SPAWNED, I suppose it is possible to try checking what creature that is.

What I currently have is this:

PHP:

package com.bukkit.infernus.INF;

import java.io.File;
import java.util.HashMap;
import org.bukkit.entity.Player;
import org.bukkit.Server;
import org.bukkit.event.Event;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.PluginLoader;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.plugin.PluginManager;

public class plgInf extends JavaPlugin {
   private final HashMap<Player, Boolean> debugees = new HashMap<Player, Boolean>();

    public plgInf(PluginLoader pluginLoader, Server instance, PluginDescriptionFile desc, File folder, File plugin, ClassLoader cLoader) {
        super(pluginLoader, instance, desc, folder, plugin, cLoader);
    }

    public void onEnable() {
        PluginManager pm = getServer().getPluginManager();
        pm.registerEvent(Event.Type.CREATURE_SPAWN, ????????Listener, Event.Priority.Normal, this);
        PluginDescriptionFile pdfFile = this.getDescription();
        System.out.println( pdfFile.getName() + " version " + pdfFile.getVersion() + " is enabled!" );
    }

    public void onDisable() {
         System.out.println("[InfPlugin] Disabled!");
    }

    public boolean isDebugging(final Player player) {
        if (debugees.containsKey(player)) {
            return debugees.get(player);
        } else {
            return false;
        }
    }

    public void setDebugging(final Player player, final boolean value) {
        debugees.put(player, value);
    }
}

I would like to know what I should put at pm.registerEvent(Event.Type.CREATURE_SPAWN, ????????Listener, Event.Priority.Normal, this);

After that I would like to know what to do next.

What I am trying to achieve is that I want to prevent certain creatures or zombies from spawning.

I would appreciate some help for this as this is my first self-written code for Minecraft.

Also, sorry for my horrible grammar, i'm quite tired.

 

1) get rid of:

Code:

    public plgInf(PluginLoader pluginLoader, Server instance, PluginDescriptionFile desc, File folder, File plugin, ClassLoader cLoader) {
        super(pluginLoader, instance, desc, folder, plugin, cLoader);
    }

plugins with that wont work any more. If eclipse complains, it means you need to update bukkit/craftbukkit.

2) you're asking what 'Listener' needs to be?
You need to create a separate class - call it whatever you like - that extends (in this case) EntityListener.
Within that class, include the function:

Code:

public void onCreatureSpawn(CreatureSpawnEvent event)
{
    //stuff to do when a creature spawns.
}

create a new instance of that class in onEnable() (MyListener listener = new MyListener()) and pass that to the registerEvent thing.

 

Ah, thank you

I think I will get this to working soon enough, if not I will post here again.