public class A {

    private D d;

    private C c;

    public A (C c) {

        this.c = c;

    }

    public void setD (D d) {

        this.d = d;

    }

    ...

    public interface B {

        public void aa();

        public void bb();

        public void cc();

    }

}

public class C {

    private A a = null;

    ...

    protected void init() {

        a = new A(this);

        a.setD(new D());

    }

    protected class D implements A.B {

        public void aa() {

            ...

        }

        public void bb() {

            ...

        }

        public void cc() {

            ...

        }

    }

}