如何对集合< T>进行排序？ [英] How to sort a Collection<T>?

问题描述

我有一个通用的集合，我试图弄清楚如何排序其中包含的项目。

I have a generic Collection and am trying to work out how I can sort the items contained within it. I've tried a few things but I can't get any of them working.

推荐答案

集合本身没有预定义顺序，因此您必须将它们转换为
a java.util.List 。然后可以使用 java.util.Collections.sort

Collections by themselves do not have a predefined order, therefore you must convert them to a java.util.List. Then you can use one form of java.util.Collections.sort

Collection< T > collection = ...;

List< T > list = new ArrayList< T >( collection );

Collections.sort( list );
 // or
Collections.sort( list, new Comparator< T >( ){...} );

// list now is sorted

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