Use Streams to return Boolean if all the List values in a Map are empty/not-empty

August 6, 2023 by Tarik

`Stream::allMatch`

In Java 8 you can check that not all lists are empty.

 boolean anyNonEmpty = !map.values().stream().allMatch(List::isEmpty);

Notice that Stream::allMatch is a short-circuiting terminal operation. So the stream is efficient, not running any longer than need be.