20170309问题解析请点击今日问题下方的“【Java每日一题】20170310”查看（问题解析在公众号首发，公众号ID：weknow619）

package Mar2017;    public class Ques0310 {        static void test() {          System.out.println("test method in Test class");      }        public static void main(String[] args) {          Ques0310 test = new Ques0310();          test.test();          Sub sub = new Sub();          sub.test();          test = sub;          test.test();                  sub = test;          sub.test();      }  }    class Sub extends Ques0310 {      static void test() {          System.out.println("test method in Sub class");      }  }

今日问题：