/media/sda-magnetic/david/Dokumente-15/fernuni-hagen/cs-i-ii/old-cs-2-03/java-new/2021-01-11/InterfaceTestProg.java

public class InterfaceTestProg {
    public static void main (String [] args) {
        ClassAB ab = new ClassAB ();
        ab.printA ();
        ab.printB ();
        ab.printAB ();
    }
    
    interface InterfaceA {public void printA ();}
    interface InterfaceB {public void printB ();}
    interface InterfaceAB extends InterfaceA, InterfaceB {public void printAB ();}
    
    public static class ClassAB implements InterfaceAB {
        ClassAB () {}
        public void printA () {System.out.println ("A");}
        public void printB () {System.out.println ("B");}
        public void printAB () {System.out.println ("AB");}
    }
}