Build Plugin

package spigotplugins.antibuild.main;

import org.bukkit.Bukkit;
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.block.BlockBreakEvent;
import org.bukkit.event.block.BlockPlaceEvent;
import org.bukkit.plugin.java.JavaPlugin;

import java.util.ArrayList;

/**
 * Created by Pascal Falk on 26.06.2017.
 * Plugin by WeLoveSpigotPlugins
 * https://youtube.com/welovespigotplugins
 * Coded with IntelliJ
 */
public class Main extends JavaPlugin implements Listener, CommandExecutor{

    public static ArrayList<Player> allowedPlayer = new ArrayList<Player>();

    @Override
    public void onEnable() {
        this.getServer().getPluginManager().registerEvents(this, this);
        getCommand("build").setExecutor(this);
    }
    @Override
    public boolean onCommand(CommandSender s, Command c, String aaaaa, String[] args) {
        if(c.getName().equalsIgnoreCase("build")){
            Player p = (Player)s;
            if(s.hasPermission("build.setup")) {
                if (args.length == 0) {
                    if (s instanceof Player) {
                        if (p.getWorld().getName().equals("world1")) {
                            if (allowedPlayer.contains(p)) {
                                allowedPlayer.remove(p);
                                p.sendMessage("§eDu hast den Baumodus §cverlassen!");
                            } else {
                                allowedPlayer.add(p);
                                p.sendMessage("§eDu hast den Baumodus §abetreten!");
                            }
                        }else{
                            p.sendMessage("§cDieser Command ist auf dieser Welt nicht gestattet!");
                            return true;
                        }
                    }
                } else {
                    s.sendMessage("§c/Build");
                }
            }else{
                s.sendMessage("§cDu hast keine Rechte um dies zu tun!");
            }
        }
        return false;
    }
    @EventHandler
    public void onBreak(BlockBreakEvent e){
        Player p = e.getPlayer();
        if(p.getWorld().getName().equals("world1")){
            if(!allowedPlayer.contains(p)){
                e.setCancelled(true);
                p.sendMessage("§cDu darfst nichts abbauen!");
                return;
            }
        }else{
            return;
        }
    }
    @EventHandler
    public void onPlace(BlockPlaceEvent e){
        Player p = e.getPlayer();
        if(p.getWorld().getName().equals("world1")){
            if(!allowedPlayer.contains(p)){
                e.setCancelled(true);
                p.sendMessage("§cDu darfst nichts abbauen!");
                return;
            }
        }else{
            return;
        }
    }
}