default and static methods in interfaces #java8 and private interface methods in #java9

MyInterface.java

// jdk8 allows default methods and static methods in interfaces 
// see also http://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html
// jdk9 allows private methods in interfaces
// see also http://mail.openjdk.java.net/pipermail/core-libs-dev/2015-March/032055.html

import java.util.concurrent.Callable;

public interface MyRunnable extends Runnable, Callable {
    default public void run() {
        func();
    }

    default Object call() {
        func();
        return null;
    }

    private void func() {
        System.out.println("hello");
    }

    public static void main(String[] args) throws Exception {
        (new MyRunnable() {}).run();
        (new MyRunnable() {}).call();
    }
}