Java 中Calendar的使用
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package pack.java.calendar.demo;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;/** * Calendar的使用; * @author ZhouHaiTao * */public class CalendarDemo {private static SimpleDateFormat date_format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");public static void main(String[] args) {//获取calendar实例;Calendar calendar = Calendar.getInstance();//判断calendar是不是GregorianCalendar类的实例;if(calendar instanceof GregorianCalendar){System.out.println("属于GregorianCalendar类的实例!");}//从calendar对象中获得date对象，当前时间;Date dates =  calendar.getTime();//格式化时间;String date_str= date_format.format(dates);System.out.println(date_str);//设置月份05；代表日历的月份6月，因为月份从0开始。calendar.set(Calendar.MONTH, 05);int months = calendar.get(Calendar.MONTH);System.out.println(months);  //输出05;//设置日期为2011-07-24 09：59:50calendar.set(2011, 06, 24, 9, 59, 50);  String getDate = date_format.format(calendar.getTime());System.out.println(getDate);   //输出2011-07-24 09:59:50;//比较日前大小;if(new Date().getTime() > calendar.getTimeInMillis()){System.out.println("当前日期在后!");}else{System.out.println("当前日期在前!");}//设置当前时间为:2011-07-24 11:06:00calendar.setTime(new Date());  int year   = calendar.get(Calendar.YEAR);   //获取年;int month  = calendar.get(Calendar.MONTH);  //获取月;int date   = calendar.get(Calendar.DATE);   //获取天;int hour   = calendar.get(Calendar.HOUR);   //获取小时;int minute = calendar.get(Calendar.MINUTE); //获取分钟;int second = calendar.get(Calendar.SECOND); //获取秒钟;int hour_of_day = calendar.get(Calendar.HOUR_OF_DAY);    //第几个小时，int day_of_month  = calendar.get(Calendar.DAY_OF_MONTH); //这天，在一个月内是第几天. int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);    //这天，在一周内，是第几天.int day_of_year = calendar.get(Calendar.DAY_OF_YEAR);    //这天，在一年内，是第几天。int week_of_year = calendar.get(Calendar.WEEK_OF_YEAR);  //这周，在一年内是第几周;int week_of_month = calendar.get(Calendar.WEEK_OF_MONTH);//这周，在这个月是第几周;以以星期为标准；int zone_offset = calendar.get(Calendar.ZONE_OFFSET);    //获取时区;int day_of_week_in_month = calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH);  //某月中第几周，按这个月1号算，1号起就是第1周，8号起就是第2周。以月份天数为标准 int r = calendar.get(Calendar.AM_PM);if(r==calendar.AM){System.out.println("现在是上午");}if(r==calendar.PM){System.out.println("现在是下午");}System.out.println("=================================================="); System.out.println(year); System.out.println(month); System.out.println(date);System.out.println(hour);System.out.println(minute);System.out.println(second);System.out.println(hour_of_day);System.out.println(day_of_month);System.out.println(day_of_week);System.out.println(day_of_year);System.out.println(week_of_year);System.out.println(week_of_month);System.out.println(zone_offset);System.out.println(day_of_week_in_month);}}