时间 问题，请教！

Question

请求指导以下问题 给出任意如下时间 如：9：30
 要求输出这个时间以后某个时间点，如 20分钟以后。
 请帮忙给出简单的代码，谢谢。

Answer 1

参考：
        Calendar c = Calendar.getInstance();
        Calendar c2 = Calendar.getInstance();
        DateFormat format =  new SimpleDateFormat("HH:mm");
        d = format.parse("12:40");
        c.setTime(d);
        c2.setTime(d);
        c.add(Calendar.MINUTE,90);
        System.out.println(format.format(c.getTime()));
        System.out.println(c.after(c2));//true

Answer 2

import java.util.*;
public class TestCalendar {
    public static void main(String[] args) {
        TestCalendar testcalendar = new TestCalendar();
        Calendar cl = Calendar.getInstance();
        System.out.println(cl.get(cl.YEAR)+"年"+cl.get(cl.MONTH)+"月"+
                           cl.get(cl.DAY_OF_MONTH)+"日 "+cl.get(cl.HOUR_OF_DAY)+
                           "："+cl.get(cl.MINUTE)+":" +cl.get(cl.SECOND));
        cl.add(Calendar.MINUTE,+20);
        System.out.println(cl.get(cl.YEAR)+"年"+cl.get(cl.MONTH)+"月"+
                           cl.get(cl.DAY_OF_MONTH)+"日 "+cl.get(cl.HOUR_OF_DAY)+
                           "："+cl.get(cl.MINUTE)+":" +cl.get(cl.SECOND));
    }
}