java25

4 tutorials tagged “java25”.

Compact Object Headers in Java 25Java 25 can shrink object headers from 12 to 8 bytes with -XX:+UseCompactObjectHeaders. Learn how it works, measure the savings, and when to turn it on.Java · hard · 4 min · Nov 13, 2026
Primitive Types in Patterns (Preview)A Java 25 preview: primitive type patterns in switch and instanceof, switching on long, double and boolean, and safe exactness checks for conversions.Java · hard · 6 min · Nov 13, 2026
Scoped Values in JavaScoped values (final in Java 25) share immutable data with called code for a bounded scope. Learn ScopedValue.where, run, get and nesting, vs ThreadLocal.Java · medium · 4 min · Nov 13, 2026
Structured Concurrency in JavaStructured concurrency (preview in Java 25) treats related subtasks as one unit with StructuredTaskScope: fork, join, and automatic cancellation when one fails.Java · hard · 5 min · Nov 13, 2026

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