Przykłady kodu do wpisu o nowych możliwościach Javy 17 znajdującego się pod adresem: https://blog.mloza.pl/java-17-nowa-wersja-z-rozszerzonym-wsparciem-lts/

PatternMatching.java

switch(i) {
    case null -> System.out.println("It's a null!");
    case Integer s && s < 10 -> System.out.println("It's a number smaller than 10");
    case String s && s.length() < 20 -> System.out.println("Short string");
    case String s -> System.out.println("Long String");
    default -> System.out.println("It's something else");
}

Shape.java

package pl.mloza;

public sealed class Shape 
        permits Circle, Square, Rectangle {

}

final class Circle extends Shape {}
non-sealed class Square extends Shape {}
final class Rectangle extends Shape {}