Iterating List of List in java8 [duplicate]

问题

This question already has answers here:

How can I turn a List of Lists into a List in Java 8? (9 answers)

Closed 5 years ago.

I was wondering, How can we iterate a multilevel list using stream API in Java 8

For example,

List<List<String>> multiList = new ArrayList<>();
List<String> names= Arrays.asList("a","b");
List<String> fewMoreNames= Arrays.asList("e","f");
multiList.add(names);
multiList.add(fewMoreNames);

As per Java 8, I should go something like below

multiList.stream().... ?

I wanted to do this fluently(using internal iteration).Any explanation would be appreciated.

回答1:

Got it folks, it was easy one. I was not looking at the API closely. One of the solution is

multiList .stream().forEach((x) -> x.stream().forEach(System.out::println));

来源：https://stackoverflow.com/questions/28342441/iterating-list-of-list-in-java8