如何从 ArrayList 中删除重复的元素? [英] How do I remove repeated elements from ArrayList?
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问题描述
我有一个 ArrayList，我想从中删除重复的字符串.我该怎么做?
I have an ArrayList<String>, and I want to remove repeated strings from it. How can I do this?
推荐答案
如果您不想在 Collection 中出现重复项，您应该考虑为什么要使用 Collection允许重复的代码>.删除重复元素的最简单方法是将内容添加到 Set(不允许重复)，然后将 Set 添加回 ArrayList:
If you don't want duplicates in a Collection, you should consider why you're using a Collection that allows duplicates. The easiest way to remove repeated elements is to add the contents to a Set (which will not allow duplicates) and then add the Set back to the ArrayList:
Set<String> set = new HashSet<>(yourList);
yourList.clear();
yourList.addAll(set);
当然，这破坏了ArrayList中元素的顺序.
Of course, this destroys the ordering of the elements in the ArrayList.
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