问题描述
我想知道是否有一种快速/干净的方法来获得两组之间的对称差异?
I'm wondering if there is a quick/clean way to get the symmetric difference between two sets ?
我有:
Set<String> s1 = new HashSet<String>();
s1.add("a");
s1.add("b");
s1.add("c");
Set<String> s2 = new HashSet<String>();
s2.add("b");
我需要类似的东西:
Set<String> diff = Something.diff(s1, s2);
// diff would contain ["a", "c"]
只是为了澄清我需要对称差异.
推荐答案
你可以使用 Google Guava 库(真的很棒，我强烈推荐它！):
You can use some functions from the Google Guava library (which is really great, I strongly recommend it!):
Sets.difference(s1, s2);
Sets.symmetricDifference(s1, s2);
difference() 和 symmetricDifference()
symmetricDifference() 完全符合 您的要求，但 difference() 通常也很有帮助.
symmetricDifference() does exactly what you are asking for, but difference() is also often helpful.
这两种方法都返回实时视图，但您可以例如在结果集上调用 .immutableCopy() 以获得不变集.如果您不想要视图，但需要一个可以修改的集合实例，请调用 .copyInto(s3).请参阅 SetView 对于这些方法.
Both methods return a live view, but you can for example call .immutableCopy() on the resulting set to get a non-changing set. If you don't want a view, but need a set instance you can modify, call .copyInto(s3). See SetView for these methods.
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