用于 Guava 不可变集合的 Java 8 收集器?
我真的很喜欢 Java 8 流和 Guava 的不可变集合，但我不知道如何将两者结合使用.
I really like Java 8 streams and Guava's immutable collections, but I can't figure out how to use the two together.
例如，如何实现 Java 8 收集器，将流结果收集到 ImmutableMultimap?
For example, how do I implement a Java 8 Collector that gathers stream results into an ImmutableMultimap?
加分:我希望能够提供键/值映射器，类似于 Collectors.toMap() 有效.
Bonus points: I'd like to be able to provide key/value mappers, similar to how Collectors.toMap() works.
推荐答案
从21版开始，可以
.collect(ImmutableSet.toImmutableSet())
.collect(ImmutableMap.toImmutableMap())
.collect(Maps.toImmutableEnumMap())
.collect(Sets.toImmutableEnumSet())
.collect(Tables.toTable())
.collect(ImmutableList.toImmutableList())
.collect(Multimaps.toMultimap(...))
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