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import java.util.*;

import static java.util.Calendar.*;

/**

* Description:

* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>

* <br/>Copyright (C), 2001-2012, Yeeku.H.Lee

* <br/>This program is protected by copyright laws.

* <br/>Program Name:

* <br/>Date:

* @author Yeeku.H.Lee kongyeeku@163.com

* @version 1.0

*/

public class CalendarTest

{

public static void main(String[] args)

{

Calendar c = Calendar.getInstance();

// 取出年

System.out.println(c.get(YEAR));

// 取出月份

System.out.println(c.get(MONTH));

// 取出日

System.out.println(c.get(DATE));

// 分别设置年、月、日、小时、分钟、秒

c.set(2003 , 10 , 23 , 12, 32, 23); //2003-11-23 12:32:23

System.out.println(c.getTime());

// 将Calendar的年前推1年

c.add(YEAR , -1); //2002-11-23 12:32:23

System.out.println(c.getTime());

// 将Calendar的月前推8个月

c.roll(MONTH , -8); //2002-03-23 12:32:23

System.out.println(c.getTime());

Calendar cal1 = Calendar.getInstance();

cal1.set(2003, 7, 23, 0, 0 , 0); //2003-8-23

cal1.add(MONTH, 6); //2003-8-23 => 2004-2-23

System.out.println(cal1.getTime());

Calendar cal2 = Calendar.getInstance();

cal2.set(2003, 7, 31, 0, 0 , 0); //2003-8-31

// 因为进位到后月份改为2月，2月没有31日，自动变成29日

cal2.add(MONTH, 6); //2003-8-31 => 2004-2-29

System.out.println(cal2.getTime());

Calendar cal3 = Calendar.getInstance();

cal3.set(2003, 7, 23, 0, 0 , 0); //2003-8-23

// MONTH字段“进位”，但YEAR字段并不增加

cal3.roll(MONTH, 6); //2003-8-23 => 2003-2-23

System.out.println(cal3.getTime());

Calendar cal4 = Calendar.getInstance();

cal4.set(2003, 7, 31, 0, 0 , 0); //2003-8-31

// MONTH字段“进位”后变成2，2月没有31日，

// YEAR字段不会改变，2003年2月只有28天

cal4.roll(MONTH, 6); //2003-8-31 => 2003-2-28

System.out.println(cal4.getTime());

}

}