Java 日历 Calendar compareTo方法

package com.codingdict;

import java.util.*;

public class CalendarDemo {
   public static void main(String[] args) {

      // create two calendar at the different dates
      Calendar cal1 = new GregorianCalendar(2015, 8, 15);
      Calendar cal2 = new GregorianCalendar(2008, 1, 02);

      // compare the time values represented by two calendar objects.
      int i = cal1.compareTo(cal2);

      // return positive value if equals else return negative value
      System.out.println("The result is :"+i);

      // compare again but with the two calendars swapped
      int j = cal2.compareTo(cal1);

      // return positive value if equals else return negative value
      System.out.println("The result is :" + j);
   }
}