Java 9: Stream.takeWhile and dropWhile

takeWhile keeps leading elements while a predicate holds; dropWhile skips them.

Code

List<Integer> nums = List.of(1, 2, 3, 4, 1, 2);
System.out.println(nums.stream().takeWhile(n -> n < 4).toList());
System.out.println(nums.stream().dropWhile(n -> n < 4).toList());

Output

[1, 2, 3]
[4, 1, 2]

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Published 2026-07-26