仅从重复的ArrayList中删除对象 [英] Removing an object from the duplicate ArrayList only

问题描述

我已经复制了一个ArrayList：

I've copied an ArrayList over as so:

MyList2 = MyList1;

尝试使用MyList1具有的对象加载MyList2的对象。

In an attempt to load MyList2's objects with the ones which MyList1 has.

现在，当我遍历MyList2时，我it.remove（）一些对象，但这会导致通过MyList1在父迭代的其他地方发生并发修改异常。我想当它it.remove（）它实际上也从原始的ArrayList中删除它，如何从MyList2中删除它？谢谢。

Now as I iterate through MyList2, I it.remove() some objects, but this is causing a concurrent modification exception elsewhere on the parent iteration through MyList1. I think when i it.remove() it's actually removing it from the original ArrayList as well, how do remove it only from MyList2? Thanks.

推荐答案

你的问题是你还没有创建 ArrayList的副本，有两个对同一对象的引用。如果你想复制列表，那么你可以做

Your problem there is that you haven´t created a copy of the ArrayList, there are two references to the same object. If you want to copy the list, then you could do

Collections.copy(MyList2,MyList1);

或

MyList2 = new ArrayList(MyList1);

这篇关于仅从重复的ArrayList中删除对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！