Client.java

package com.example;

import java.lang.reflect.Method;

public class Client {

    public static void main(String[] args) throws Exception {
        A a = new A();
        B b = new B();
        Method m = A.class.getMethod("hello");
        System.out.println(m.invoke(a)); // A
        System.out.println(m.invoke(b)); // B super.hello()?
    }
    
    public static class A {
        public String hello() {
            return "A";
        }
    }
    
    public static class B extends A {
        @Override
        public String hello() {
            return "B";
        }
    }
}