本文介绍了如何从ArrayList中删除重复的元素?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个 ArrayList
的 Strings
,我想删除重复的字符串。
I have an ArrayList
of Strings
, and I want to remove repeated strings from it. How can I do this?
推荐答案
如果您不想在集合
,您应该考虑为什么您使用允许重复的集合
。删除重复元素的最简单方法是将内容添加到 Set
(这将不允许重复),然后添加 Set
回到 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,这破坏了 ArrayList
。
Of course, this destroys the ordering of the elements in the ArrayList
.
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