public class TestCalendar {

     public static void main(String[] args) throws ParseException {

         TestCalendar testCalendar = new TestCalendar();

         testCalendar.testCalendar();

         testCalendar.testCalendar2();

     }

     public void testCalendar(){

         //创建Calendar的方式

         Calendar now1 = Calendar.getInstance();

         Calendar now2 = new GregorianCalendar();

         Calendar now3 = new GregorianCalendar(2016, 01, 24);

         Calendar now4 = new GregorianCalendar(2016, 01, 24, 15, 55);      //陷阱:Calendar的月份是0~11

         Calendar now5 = new GregorianCalendar(2016, 01, 24, 15, 55, 44);

         Calendar now6 = new GregorianCalendar(Locale.US);

         Calendar now7 = new GregorianCalendar(TimeZone.getTimeZone("GMT-8:00")); 

         //通过日期和毫秒数设置Calendar

         now2.setTime(new Date());

         System.out.println(now2); 

         now2.setTimeInMillis(new Date().getTime());

         System.out.println(now2); 

         //定义日期的中文输出格式,并输出日期

         SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月dd日 hh时mm分ss秒 E", Locale.CHINA);

         System.out.println("获取日期中文格式化化输出：" + df.format(now5.getTime()));

         System.out.println(); 

         System.out.println("--------通过Calendar获取日期中年月日等相关信息--------");

         System.out.println("获取年：" + now5.get(Calendar.YEAR));

         System.out.println("获取月(月份是从0开始的)：" + now5.get(Calendar.MONTH));

         System.out.println("获取日：" + now5.get(Calendar.DAY_OF_MONTH));

         System.out.println("获取时：" + now5.get(Calendar.HOUR));

         System.out.println("获取分：" + now5.get(Calendar.MINUTE));

         System.out.println("获取秒：" + now5.get(Calendar.SECOND));

         System.out.println("获取上午、下午：" + now5.get(Calendar.AM_PM));

         System.out.println("获取星期数值(星期是从周日开始的)：" + now5.get(Calendar.DAY_OF_WEEK));

         System.out.println(); 

         System.out.println("---------通用星期中文化转换---------");

         String dayOfWeek[] = {"", "日", "一", "二", "三", "四", "五", "六"};

         System.out.println("now5对象的星期是:" + dayOfWeek[now5.get(Calendar.DAY_OF_WEEK)]);

         System.out.println(); 

         System.out.println("---------通用月份中文化转换---------");

         String months[] = {"一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"};

         System.out.println("now5对象的月份是: " + months[now5.get(Calendar.MONTH)]);

     }

     public void testCalendar2() throws ParseException{

         //获取当前月份的最大天数

         Calendar cal = Calendar.getInstance();

         int maxday=cal.getActualMaximum(Calendar.DAY_OF_MONTH);

         int minday=cal.getActualMinimum(Calendar.DAY_OF_MONTH);

         System.out.println(maxday);

         //取当月的最后一天

         DateFormat formatter3=new SimpleDateFormat("yyyy-MM-"+maxday);

         System.out.println(formatter3.format(cal.getTime()));

         //取当月的最后一天

         DateFormat formatter4=new SimpleDateFormat("yyyy-MM-"+minday);

         System.out.println(formatter4.format(cal.getTime()));

         //求两个日期之间相隔的天数

         java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");

         java.util.Date beginDate= format.parse("2007-12-24");

         java.util.Date endDate= format.parse("2007-12-25");

         long day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);

         System.out.println("相隔的天数="+day);

         //一年前的日期

         java.text.Format formatter5=new java.text.SimpleDateFormat("yyyy-MM-dd");

         java.util.Date todayDate=new java.util.Date();

         long beforeTime=(todayDate.getTime()/1000)-60*60*24*365;

         todayDate.setTime(beforeTime*1000);

         String beforeDate=formatter5.format(todayDate);

         System.out.println(beforeDate);

         Calendar calendar = Calendar.getInstance();

         calendar.add(Calendar.YEAR, -1);

         System.out.println(formatter5.format(calendar.getTime()));

         //当前星期的星期一和星期日

         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");

         GregorianCalendar gregorianCalendar = new GregorianCalendar();

         int dayInWeek = gregorianCalendar.get(Calendar.DAY_OF_WEEK);

         int offset = 0;

         if (dayInWeek == 1) {

             // 星期天

             offset = 6;

         } else {

             // 星期一至星期六

             offset = dayInWeek - 2;

         }

         gregorianCalendar.add(GregorianCalendar.DAY_OF_MONTH, -offset);

         String sday = dateFormat.format(gregorianCalendar.getTime());

         gregorianCalendar.add(GregorianCalendar.DAY_OF_MONTH, 6);

         String eday = dateFormat.format(gregorianCalendar.getTime());

         System.out.println("这个星期的星期一:" + sday);

         System.out.println("这个星期的星期天:" + eday);

     }

 }