Bukkit Plugin Programmieren

package de.dasflo.weapons;

import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.entity.Snowball;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.entity.EntityDamageByEntityEvent;
import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
import org.bukkit.event.player.PlayerInteractEvent;

public class Automatic implements Listener
{
	ArrayList<String> reload = new ArrayList<>();
	public int Magazin = 10;

	private Weapmain plugin;

	public Automatic(Weapmain plugin)
	{
		this.plugin = plugin;
		plugin.getServer().getPluginManager().registerEvents((Listener) this, plugin);
	}

	@EventHandler
	public void entityDamage(EntityDamageByEntityEvent event) {
		 if(event.getCause() == DamageCause.PROJECTILE){
	            if(event.getDamager() instanceof Snowball){
	                if(event.getEntity() instanceof Player){
	                    event.setDamage(3);
	                }
	            }
		 }
	}

	@EventHandler
	public void Playklick(PlayerInteractEvent e) {
	    final Player p = e.getPlayer();

	     if(p.getItemInHand().getType() == Material.DIAMOND) {
	    	 if(e.getAction() == Action.RIGHT_CLICK_AIR | e.getAction() == Action.RIGHT_CLICK_BLOCK) {
	    		 if(Magazin != 0) {
	    			 p.launchProjectile(Snowball.class);
	    			 Magazin--;
	    		 				  }
		    		 	}else
		    	   			if(e.getAction() == Action.LEFT_CLICK_AIR | e.getAction() == Action.LEFT_CLICK_BLOCK) {
		    	   				if(Magazin == 0) {
		    	   					reload.add(p.getName());
		    	   					p.sendMessage("§2" + p.getName() + ": §cLade Nach !");
		    	   					Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable()
		    	   					{

		    	   						@Override
		    	   						public void run()
		    	   						{
		    	   							reload.remove(p.getName());
		    	   							p.sendMessage("§2" + p.getName() + ": §cHabe nachgeladen !");
		    	   							Magazin = 10;
		    	   						}

		    	   					}, 20*5);
		    	   				}
		    	   			}
	     				}
					}
				}