Java 21 LTS Architectural Overview

Java 21 brings long-term support with game-changing language refinements that simplify concurrent programming and modern functional paradigms.

Record Patterns & Deconstruction

Deconstruct complex data structures directly inside pattern matching:

public record Point(int x, int y) {}

public static void printPoint(Object obj) {
    if (obj instanceof Point(int x, int y)) {
        System.out.printf("Coordinates: %d, %d%n", x, y);
    }
}

Sequenced Collections

Unified interface for ordered collections:

List<String> list = new ArrayList<>(List.of("first", "second", "third"));
String first = list.getFirst();
String last = list.getLast();