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Title: Stream.iterate() with predicate | java.evolved

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Description: Use a predicate to stop iteration — like a for-loop in stream form.

Open Graph Description: Use a predicate to stop iteration — like a for-loop in stream form.

X Description: Use a predicate to stop iteration — like a for-loop in stream form.

Opengraph URL: https://javaevolved.github.io/streams/stream-iterate-predicate.html

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Stream.iterate() ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/stream/Stream.html#iterate(T,java.util.function.Predicate,java.util.function.UnaryOperator)
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/streams/StreamIteratePredicate.java
Streams Intermediate Virtual thread executor Java 8 ExecutorService exec = Executors.newFixedThreadPool(10); try { futures = tasks.stream() .map(t -> exec.submit(t)) .toList(); } finally { exec.shutdown(); } Java 21+ try (var exec = Executors .newVirtualThreadPerTaskExecutor()) { var futures = tasks.stream() .map(exec::submit) .toList(); } Hover to see modern ➜ JDK 21+ → https://javaevolved.github.io/streams/virtual-thread-executor.html
Streams Intermediate Optional.or() fallback Java 8 Optional cfg = primary(); if (!cfg.isPresent()) { cfg = secondary(); } if (!cfg.isPresent()) { cfg = defaults(); } Java 9+ Optional cfg = primary() .or(this::secondary) .or(this::defaults); Hover to see modern ➜ JDK 9+ → https://javaevolved.github.io/streams/optional-or.html
Streams Beginner Optional.ifPresentOrElse() Java 8 Optional user = findUser(id); if (user.isPresent()) { greet(user.get()); } else { handleMissing(); } Java 9+ findUser(id).ifPresentOrElse( this::greet, this::handleMissing ); Hover to see modern ➜ JDK 9+ → https://javaevolved.github.io/streams/optional-ifpresentorelse.html
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