default methods

default.java

public class Test {
    interface A {
        default String a() {return "A";}
    }
    interface B {
        default String b() {return "B";}
    }

    static class C implements A, B{}

    public static void main(String... args) {
        C c = new C();
        System.out.println(c.a());
        System.out.println(c.b());
        D d = new D();
        System.out.println(d.a());
        //System.out.println(d.b()); //nope
    }
}