我如何删除从ArrayList中重复的元素？ [英] How do I remove repeated elements from ArrayList?

问题描述

我字符串的的ArrayList ，我想从中删除重复的字符串。我怎样才能做到这一点？

I have an ArrayList of Strings, and I want to remove repeated strings from it. How can I do this?

推荐答案

如果你不想在集合重复，你应该考虑为什么您使用的是集合允许重复。删除重复的元素的最简单方法是将内容添加到一套（这将不允许重复），然后添加设置回到的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:

List<String> al = new ArrayList<>();
// add elements to al, including duplicates
Set<String> hs = new HashSet<>();
hs.addAll(al);
al.clear();
al.addAll(hs);

当然，这会破坏ArrayList中元素的顺序。

Of course, this destroys the ordering of the elements in the ArrayList.

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