ArrayList<String> values=new ArrayList<String>();
values.add("s");
values.add("n");
values.add("a");
values.add("s");

在此阵，我想删除重复的值。

In this Array, I want to remove repeated values.

推荐答案

如果你不想在集合重复，你应该考虑为什么你使用的集合，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），然后添加设回ArrayList的：

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:

ArrayList al = new ArrayList();
// add elements to al, including duplicates
 HashSet hs = new HashSet();
hs.addAll(al);
al.clear();
al.addAll(hs);

最重要的是，这会破坏ArrayList中元素的顺序。

most importantly, this destroys the ordering of the elements in the ArrayList.