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Title: Virtual threads | java.evolved

Open Graph Title: Virtual threads | java.evolved

X Title: Virtual threads | java.evolved

Description: Create millions of lightweight virtual threads instead of heavy OS threads.

Open Graph Description: Create millions of lightweight virtual threads instead of heavy OS threads.

X Description: Create millions of lightweight virtual threads instead of heavy OS threads.

Opengraph URL: https://javaevolved.github.io/concurrency/virtual-threads.html

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Domain: javaevolved.github.io


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Virtual Threads (JEP 444) ↗https://openjdk.org/jeps/444
Thread.ofVirtual() ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/Thread.html#ofVirtual()
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/concurrency/VirtualThreads.java
Concurrency Beginner Thread.sleep with Duration Java 8 // What unit is 5000? ms? us? Thread.sleep(5000); // 2.5 seconds: math required Thread.sleep(2500); Java 19+ Thread.sleep( Duration.ofSeconds(5) ); Thread.sleep( Duration.ofMillis(2500) ); Hover to see modern ➜ JDK 19+ → https://javaevolved.github.io/concurrency/thread-sleep-duration.html
Concurrency Advanced Scoped values Java 8 static final ThreadLocal CURRENT = new ThreadLocal<>(); void handle(Request req) { CURRENT.set(authenticate(req)); try { process(); } finally { CURRENT.remove(); } } Java 25 static final ScopedValue CURRENT = ScopedValue.newInstance(); void handle(Request req) { ScopedValue.where(CURRENT, authenticate(req) ).run(this::process); } Hover to see modern ➜ JDK 25+ → https://javaevolved.github.io/concurrency/scoped-values.html
Concurrency Intermediate CompletableFuture chaining Pre-Java 8 Future future = executor.submit(this::fetchData); String data = future.get(); // blocks String result = transform(data); Java 8+ CompletableFuture.supplyAsync( this::fetchData ) .thenApply(this::transform) .thenAccept(IO::println); Hover to see modern ➜ JDK 8+ → https://javaevolved.github.io/concurrency/completablefuture-chaining.html
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