Java8 Lambda:连接列表
我正在尝试连接流列表并对其进行处理.
I am trying to concat list of a stream and process it.
class A {
public List<B> bList;
}
List<A> aList;
aList.stream().map(a -> a.bList)....
这里我得到了几个 b 列表.
Here i get several list of b.
但是，我想将我所有的 b 都收集在一个列表中.有什么想法吗?
But, I would like to collect all my b in only one list. Any ideas ?
推荐答案
这就是 flatMap 的用途:
That's what flatMap is for :
List<B> bList = aList.stream()
.flatMap(a -> a.bList.stream())
.collect(Collectors.toList());
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