Java 25 features

Every feature that matters in Java 25, each with a short explanation and an example you can run.

• Write Java without public static void main

  Compact source files and instance main methods: the smallest Java program is now three lines.

• Scoped Values vs ThreadLocal

  Share immutable data down a call chain without parameters and without cleanup bugs.

• Flexible constructor bodies

  Validate arguments before calling super(), without static helper tricks.

• import module java.base explained

  One import line instead of a wall of java.util and java.util.stream imports.