相当于Guavas Maps.uniqueIndex（…）的Set

Question

Guava has a static method Maps.uniqueIndex(Iterable<V> values, Function<? super V,K> keyFunction) which maps each entry in the entered collection by the result of the entered function applied on respective elements.

Is there an equivalent of this function for Sets (where the return value is not a map but a set)?

Answer 1

A few alternatives:

Maps.uniqueIndex(values, keyFunction).keySet();
ImmutableSet.copyOf(Collections2.transform(values, function));

Answer 2

我实际上找到了一个简单的解决方案：

FluentIterable.from(values).transform(keyFunction).toSet();