How Can I Limit an Infinite Java 8 Stream Based on a Predicate?

Java 8: Implementing Stream Limiting Based on Predicate Match

Java 8 lacks a specific stream operation that limits a potentially infinite stream until an element fails to match a given predicate. While Java 9 introduces the takeWhile operation for this purpose, Java 8 users seek alternative implementation strategies.

Solution in Java 8

To implement predicate-based stream limiting in Java 8, the following approach can be employed:

• Create an Infinite Stream: Utilize Stream.iterate or Stream.generate to create an infinite stream of values.
• Use limit and filter Operations: Apply the limit operation with an arbitrary limit (such as Long.MAX_VALUE) to avoid infinite iteration. Then, use filter to evaluate the predicate for each element. This ensures that iteration continues until the predicate fails.

Example:

IntStream.iterate(1, n -> n + 1)
    .limit(Long.MAX_VALUE)
    .filter(n -> n < 10)
    .forEach(System.out::println);

Java 9 and Beyond

If using Java 9 or later, the takeWhile operation simplifies the implementation:

IntStream.iterate(1, n -> n + 1)
    .takeWhile(n -> n < 10)
    .forEach(System.out::println);

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