Java Streams Intermediate Operations dropWhile() and takeWhile()

Pubblicato il: 25 settembre 2023
sul canale di: Douglas Schmidt

110

This video discusses two stateful, short-circuiting intermediate operations in Java streams: dropWhile() and takeWhile(), introduced in Java 9. dropWhile() removes elements from the stream until a predicate condition fails, while takeWhile() includes elements as long as the predicate holds true. Both methods differ significantly from filter() since they stop processing once a certain condition is met. I caution against using these operations in ordered parallel streams due to performance overhead. Practical examples are provided from the SimpleSearchStream case study, including using dropWhile() to ignore elements until a keyword is matched and takeWhile() to collect elements up to a certain match.

All the code shown in this video is available in open-source form from http://github.com/douglascraigschmidt....

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