블럭 설치 시 "가지고 있는" 디버프 중 1개를 랜덤으로 제거되게 하고싶은데

설정해둔 모든 디버프 중 1개가 랜덤으로 제거되게밖에 못하겠네요 블럭 설치 시 가지고 있는 디버프 중에서 1개를 랜덤으로 제거되기 하려면 어떻게 해야하나요?

package g1.test.hyuphop.Test;

import org.bukkit.command.CommandExecutor;
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 org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

import java.util.Random;

public final class hyuphop extends JavaPlugin implements Listener, CommandExecutor {

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this,this);
        // Plugin startup logic

    }

    @Override
    public void onDisable() {
        // Plugin shutdown logic
    }

    @EventHandler
    public void block1(BlockBreakEvent e) {
        Player w = e.getPlayer();
        Random re = new Random();

        int Random = re.nextInt(15)+1;
        if(Random == 1) {
            w.addPotionEffect(new PotionEffect(PotionEffectType.DARKNESS, 999999, 1, true));

        }if(Random == 2){
            w.addPotionEffect(new PotionEffect(PotionEffectType.SLOW,999999,5,true));

        }if(Random == 3){
            w.addPotionEffect(new PotionEffect(PotionEffectType.SLOW_DIGGING,99999,1,true));

        }if(Random == 4){
            w.addPotionEffect(new PotionEffect(PotionEffectType.CONFUSION,999999,3,true));

        }if(Random == 5){
            w.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS,999999,2,true));

        }if(Random == 6){
            w.addPotionEffect(new PotionEffect(PotionEffectType.HUNGER,999999,3,true));

        }if(Random == 7){
            w.addPotionEffect(new PotionEffect(PotionEffectType.WEAKNESS,999999,1,true));

        }if(Random == 8){
            w.addPotionEffect(new PotionEffect(PotionEffectType.POISON,999999,4,true));

        }if(Random == 9){
            w.addPotionEffect(new PotionEffect(PotionEffectType.WITHER,999999,3,true));

        }if(Random == 10){
            w.addPotionEffect(new PotionEffect(PotionEffectType.UNLUCK,999999,255,true));

        }if(Random == 11){
            w.addPotionEffect(new PotionEffect(PotionEffectType.HARM,1,0,true));

        }if(Random == 12){
            w.addPotionEffect(new PotionEffect(PotionEffectType.GLOWING,999999,255,true));

        }if(Random == 13){
            w.addPotionEffect(new PotionEffect(PotionEffectType.LEVITATION,999999,0,true));

        }if(Random == 14){
            w.addPotionEffect(new PotionEffect(PotionEffectType.BAD_OMEN,999999,2,true));

        }if(Random == 15){
            w.addPotionEffect(new PotionEffect(PotionEffectType.JUMP,999999,200,true));
        }
    }

    @EventHandler //isExtendable() //PotionData
    public void block2(BlockPlaceEvent e) {
        Player q = e.getPlayer();
        Random re1 = new Random();

        if(q.addPotionEffect(new PotionEffect(PotionEffectType.DARKNESS, 999999, 1, true));
        int Random = re1.nextInt(2)+1;
        if(Random == 1){
            q.sendMessage("test");
    }else{
        q.sendMessage("test2");
    }

}

}