What is new in Java 25?

Java 25 (September 2025) is an LTS release, so it gets updates for many years. Some of the final features:

• Compact source files and instance main methods (JEP 512): small programs without the class and public static, plus IO.println.
• Module import declarations (JEP 511): import module java.base; imports all the public packages of a module.
• Flexible constructor bodies (JEP 513): statements before super(...), for checks.
• Scoped values (JEP 506): a safer way to share data between threads than thread locals.
• Compact object headers (JEP 519) and other performance work.

We can test the first three on a real Java 25:

import module java.base;

void main() {
    List<String> names = new ArrayList<>(List.of("Riya", "Aman"));      // List and ArrayList without a normal import
    IO.println(names);
    IO.println(new Child(-5).value());
}

class Parent {
    final int value;
    Parent(int value) { this.value = value; }
    int value() { return value; }
}

class Child extends Parent {
    Child(int raw) {
        int fixed = Math.max(raw, 0);       // a statement before super(...), allowed in Java 25
        super(fixed);
    }
}

Java 27 is newer, but it is not an LTS. See the chapter Java Introduction for the versions.

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