java - 从列表中删除对象 - ConcurrentModificationException

Question

这个问题已经有答案了:

Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop (31 个回答)

已关闭 9 年前。

我有这个代码:

public static void main(String[] args) {
    User user = new User("user1","user1",1l);
    User user1 = new User("user2","user2",2l);
    User user2 = new User("user3","user3",3l);

    List<User> list = new ArrayList<User>();
    list.add(user);
    list.add(user1);
    list.add(user2);

    for(User user3 : list){
        System.out.println(user3.getName());
        if(user3.getName().equals("user1")){
            list.remove(user3);
        }
    }
}

执行此代码时，出现以下错误:

Exception in thread "main" java.util.ConcurrentModificationException
    at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
    at java.util.AbstractList$Itr.next(Unknown Source)

如何避免它？

Answer 1

使用Iterator迭代列表，然后使用Iterator.remove()删除特定元素