如何在Java 8中将列表列表转换为列表？ [英] How can I turn a List of Lists into a List in Java 8?

问题描述

如果我有列表< List< Object>> ，如何将其转换为列表< Object> 包含使用Java 8功能的相同迭代顺序中的所有对象？

If I have a List<List<Object>>, how can I turn that into a List<Object> that contains all the objects in the same iteration order by using the features of Java 8?

推荐答案

您可以使用< a href =https://docs.oracle.com/javase/8/docs/api/java/util/stream/Stream.html#flatMap-java.util.function.Function- =noreferrer> flatMap 将内部列表（将它们转换为Streams后）展平为单个Stream，然后将结果收集到列表中：

You can use flatMap to flatten the internal lists (after converting them to Streams) into a single Stream, and then collect the result into a list:

List<List<Object>> list = ...
List<Object> flat = 
    list.stream()
        .flatMap(List::stream)
        .collect(Collectors.toList());

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