Java 使用 Guava 将 List 转换和转换为 Set
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Transform and convert a List to Set with Guava
提问by Omar Hrynkiewicz
Is there a simple way to convertand transforma List to Set with Guava?
有没有一种简单的方法可以使用 Guava 将 List转换和转换为 Set？
I'd like to use method:
我想使用方法：
Set<To> result = Sets.transformToSet(myList, new Function<From, To>() {
public To apply(From item) {
return convert(item);
}
});
this is my code, with "tempCollection"
这是我的代码，带有“tempCollection”
Collection<To> tempCollection = Collections2.transform(myList, new Function<From, To>() {
public To apply(From item) {
return convert(item);
}
});
Set<To> result = newHashSet(tempCollection );
采纳答案by JB Nizet
Set<To> result = FluentIterable.from(myList)
.transform(new Function<From, To>() {
@Override
public To apply(From input) {
return convert(input);
}
})
.toSet();
This creates an ImmutableSet, which does not accept null. So if you want your Set to contain null, you'll have to use another solution, like the one you're currently using.
这将创建一个不接受 null 的 ImmutableSet。因此，如果您希望 Set 包含 null，则必须使用另一种解决方案，例如您当前使用的解决方案。
Note that, if it's the creation of the temporary collection that bothers you, you shouldn't be bothered. No copy is made. The collection is simply a view over the original list.
请注意，如果困扰您的是临时集合的创建，您不应该被打扰。没有复制。该集合只是原始列表的视图。
