public class ObClo2 {
    private abstract class AbAdder {
        abstract int addSome(int some);
    }

    public void useAdder(AbAdder aa) {
        System.out.println(aa.addSome(7));
    }

    private class RegAdder {
        int addSome(int some) {
            return some;
        }
    }

    public void useAdder(RegAdder aa) {
        System.out.println(aa.addSome(7));
    }
    
    interface IAdder {
        int addSome(int some);
    }
    public void useAdder(IAdder aa) {
        System.out.println(aa.addSome(7));
    }


    public void doIt() {
        AbAdder adder6 = new AbAdder(){
            int addSome(int some) {
                return some + 7;
            }
        };
        useAdder(adder6);
        RegAdder adder9 = new RegAdder() {
            int addSome(int some) {
                return some + 9;
            }
        };
        useAdder(adder9);
        IAdder adder11 = new IAdder(){
            public int addSome(int some) {
                return some + 11;
            }
        };
        useAdder(adder11);
    }

    public static void main(String[] args) {
        (new ObClo2()).doIt();
    }
}