Java接口回调

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() {
            ...
        }
    }
}