java 2个集合之间的区别？（集合1中的元素，但不在集合2中）
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Difference between 2 collections? (elements in collection1, but not in collection2)
提问by stefan.at.wpf
In Java (maybe using Guava?), is there some method provided to get the difference of two Collections, e.g. a Listand a Setwithoutmodifying one of these Collections (else there would be collection1.removeAll(collection2)?
在 Java 中（也许使用 Guava？），是否提供了一些方法来获得两个Collections的差异，例如 aList和 aSet而不修改其中一个Collection（否则会有collection1.removeAll(collection2)?
In Guava there is Sets.difference(set1,set2), but it only works for Sets, not for arbitrary collections.
在 Guava 中有Sets.difference(set1,set2)，但它只适用于Sets，不适用于任意集合。
Thanks for any hint!
感谢您的任何提示！
回答by Frank Pavageau
You can filter the first Collectionusing built-in Predicates:
您可以Collection使用内置Predicates过滤第一个：
Collections2.filter(c1, Predicates.not(Predicates.in(c2))
It works with any kind of Collections, but obviously it's better if c2is a Set.
它适用于任何类型的Collections，但显然如果c2是Set.
回答by Mike
ApacheCommons CollectionUtils has a method named disjuction that
ApacheCommons CollectionUtils有一个方法叫disjuction那
Returns a Collection containing the exclusive disjunction (symmetric difference) of the given Iterables
返回一个包含给定 Iterables 的互斥析取（对称差异）的 Collection
