NoPickup for forums.bukkit

package me.dinosparkour.debug;

import java.util.ArrayList;
import java.util.UUID;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerPickupItemEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class Main
extends JavaPlugin
implements Listener, CommandExecutor{

    @Override
    public void onEnable(){getServer().getPluginManager().registerEvents(this, this);}

    ArrayList<UUID> list = new ArrayList<UUID>();

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
        Player p = (Player) sender;
        if(commandLabel.equalsIgnoreCase("Test")){
            if (list.contains(p.getUniqueId())) {
                list.remove(p.getUniqueId());
                p.sendMessage("You're now off the list");
            } else {
                list.add(p.getUniqueId());
                p.sendMessage("You're now in the list");
            }
        }
        return false;
    }

    @EventHandler
    public void onPickup(PlayerPickupItemEvent event) {
        Player player = event.getPlayer();
        if(list.contains(player.getUniqueId())) {
            event.setCancelled(true);
            player.sendMessage("You have disabled item-pickup");

        }
    }
}