请问下面的代码的异常怎么写，跪求大神解答！！！

public void createPlayer() throws Exception {

System.out.println("------------------创建玩家---------------------");

int i=0;

while(i<2) {

System.out.println("请输入第"+(i+1)+"个玩家的id：");

int id =dllx.nextInt();

Players p=player.get(id);

if(p==null) {

System.out.println("请输入名字：");

String name =dllx.next();

Players newplayer= new Players(id,name);

player.put(id, newplayer);

i++;

} else {

System.out.println("你输入的id已被占用，请重新输入！");

continue;

}

}

System.out.println("***欢迎玩家***");

Set<Integer> key= player.keySet();

for (Integer integer : key) {

Players p = player.get(integer);

if(p!=null) {

System.out.println("玩家："+p.getName());

}

}

}