Java中两组的对称差异 [英] Symmetric difference of two sets in Java

问题描述

我的应用中有两个 TreeSet ：

set1 = {501,502,503,504}
set2 = {502,503,504,505}

我想得到对称差异，以便我的输出为集合：

I want to get the symmetric difference of these sets so that my output would be the set:

set = {501,505}

推荐答案

您正在追踪对称差异。这在 Java教程中讨论。

You're after the symmetric difference. This is discussed in the Java tutorial.

Set<Type> symmetricDiff = new HashSet<Type>(set1);
symmetricDiff.addAll(set2);
// symmetricDiff now contains the union
Set<Type> tmp = new HashSet<Type>(set1);
tmp.retainAll(set2);
// tmp now contains the intersection
symmetricDiff.removeAll(tmp);
// union minus intersection equals symmetric-difference

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