Java15Features.java

//package java15;
//
//import org.junit.Test;
//
//public class Java15Features {
//
//    /**
//     * Java 15 introduce [sealed] class just like Scala had, to create super classes that must be extended
//     * by subclass. It also contains a cool feature which is [permits] where as a sealed class, only allow to be
//     * extended by some specific classes.
//     * <p>
//     * Here in order to make this whole bound perfect, Javas introduce [non-sealed], which means
//     * The subclass must extend a [sealed] class
//     */
//    public sealed class MySealedClass permits SealedClassExtension {
//        public String helloSealedWorld = "hello world";
//    }
//
//    public non-sealed class SealedClassExtension extends MySealedClass {
//        public void init() {
//            System.out.println(helloSealedWorld);
//        }
//    }
//
//    @Test
//    public void sealedFeature() {
//        new SealedClassExtension().init();
//    }
//
//}