EventHandler返回类型为构造函数？

Question

我有一个@EventHandler，我想使用constructor.package进行异步工作

public class MonsterLevel implements Listener{

public MonsterLevel(int level, Player p) {
        switch (level) { //The onclick Event should Increment this level whenever it is activated.
             case 1: 
                 //Changes Here
                 return;

             case 2: 
                 //Changes Here
                 return;
             default: 
                      System.out.println("Level is too high");
                      return;
             }
    }

@EventHandler //When the player activates this event it should run the MonsterLevel Constructor Method.
public MonsterLevel LevelUp(PlayerInteractEvent event){ 
 MonsterLevel level1 = new MonsterLevel(1,p);
 MonsterLevel level2 = new MonsterLevel(2,p);
                if(level==1) {
                    level++;
                    p.sendMessage(ChatColor.AQUA + "Level: " + level);
                    return level1;
                }
                if(level==2) {
                    level++;
                    p.sendMessage(ChatColor.AQUA + "Level: " + level);
                    return level2;
                }return level4;
                }
        } else {
            p.sendMessage(ChatColor.AQUA + "Failed to Level Up");
        }
    return null; // Goes to switch's default?
    }
}

我已经评论了上面的代码。但我要问的是，作为Java的标准，我可以让eventhandler使用构造函数吗？如果没有，有人可以指示我正确的方向吗？

由于