如何返回两个列表之间的差异? [英] How can I return the difference between two lists?

问题描述

我有两个数组列表，例如

I have two array lists e.g.

List<Date> a;
contains : 10/10/2014, 10/11/2016

List<Date> b;
contains : 10/10/2016

我如何在列表a和b之间进行检查，以便返回b中缺少的值? 10/10/2014

How can i do a check between list a and b so the value that is missing in b is returned?e.g. 10/10/2014

推荐答案

您可以将它们转换为Set集合，并对它们执行集合差操作.

You can convert them to Set collections, and perform a set difference operation on them.

赞:

Set<Date> ad = new HashSet<Date>(a);
Set<Date> bd = new HashSet<Date>(b);
ad.removeAll(bd);

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