wat.java

class D {
    int method(D x) {
        return -1;
    }
    int method() {
        return 0;
    }
}

class E extends D {
    int method() {
        return 1;
    }
    int method(D x) {
        return 2;
    }
    int method(E x) {
        return 3;
    }
}

class F extends E {
    int fun(D d) {
        return d.method();
    }
    int foo() {
        return ((D)this).method((D)this);
    }
}

class Apple {
    public static void main(String[] args) {
        F x = new F();
        System.out.println(x.foo());
    }
}