马老师sprIngcloUd alibaba实战课源码精讲（一期） 马老师sprIngcloUd alibaba实战课

public class Father {

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        Son s = new Son();

        s.sayHello();

    }

    public void sayHello() {

        System.out.println("Hello");

    }

}

class Son extends Father{

    @Override

    public void sayHello() {

        // TODO Auto-generated method stub

        System.out.println("hello by ");