Java，从 ArrayList 中删除对象 [英] Java , Removing object from ArrayList

问题描述

我有一个 ClassA，它有一个静态的对象 ArrayList

I have ClassA which has a static ArrayList of Objects

public static ArrayList<Meteorit> meteorits = new ArrayList<Meteorit>();

现在我想从这个列表中删除一个对象

Now I want to remove an object from this list like this

ClassA.meteorits.remove(this);

这是用 Meteorit 类编写的.但是当我想使用 ArrayList 中的对象时它会抛出异常.

This is written in Meteorit class . But it throws exception when I want to use the objects in the ArrayList .

Exception in thread "LWJGL Application" java.util.ConcurrentModificationException

我使用 Iterator 从 ArrayList 中删除对象，但现在我不知道如何在这种情况下使用它.

I used Iterator to remove objects from ArrayList but now I dont have an idea how to use it in this case.

推荐答案

这是因为某个线程实际上正在 for each 循环中查看此列表，也许您正试图在 for-each 的主体中删除此列表的元素?你不能在 for-each 中删除元素，但你可以在迭代器循环中:

It is because some thread is actually viewing this list in a for each loop, maybe you are trying to remove elements of this list in the body of for-each? You can't remove elements in for-each, but you can in iterator loops:

您可以使用迭代器代替 for each 来删除和查看列表中的元素，如下所示:

You can use iterator instead of for each to remove and view the elements of the list like this:

public static ArrayList<Meteorit> meteorits = new ArrayList<Meteorit>();

Iterator<Meteorit> itr = meteorits.iterator();

while (itr.hasNext()) {
       if (itr.next()==this) {
          itr.remove();
       }
}

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