Java Calendar使用总结

	        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
		/*初始化*/
		Calendar cal = Calendar.getInstance();
		
		int year = cal.get(Calendar.YEAR);//年  
		int month = cal.get(Calendar.MONTH)+1;//月
		int day = cal.get(Calendar.DATE);//日  
		int hour = cal.get(Calendar.HOUR_OF_DAY);//时  
		int minute = cal.get(Calendar.MINUTE);//分
		int second = cal.get(Calendar.SECOND);//秒  
		int weekday = cal.get(Calendar.DAY_OF_WEEK);//星期   周日-周六对应1-7
		int last = cal.getActualMaximum(cal.DAY_OF_MONTH); // 获取本月最大天数
		int DAY_OF_YEAR = cal.get(Calendar.DAY_OF_YEAR);//今年的第几天
		int DAY_OF_MONTH = cal.get(Calendar.DAY_OF_MONTH);//本月的第几天
		System.out.println("现在是: "+year+" 年 "+month+" 月 "+day+
				" 日 "+hour+" 时 "+minute+" 分 "+second+" 秒 "+"\nweekday: "+weekday
				+" 本月天数 :"+last+" 今年的第几天:"+DAY_OF_YEAR+" 本月第几天:"+DAY_OF_MONTH);
		
		cal.set(2013, 5, 4, 13, 44, 51);//年月日时分秒（月份0代表1月）  ，毫秒不会自动清零
		System.out.println(sdf.format(cal.getTime()));
		cal.set(Calendar.MILLISECOND, 0);//毫秒清零
		System.out.println(sdf.format(cal.getTime()));
		cal.set(Calendar.YEAR, 2014);//年  
		cal.set(Calendar.MONTH, 7);//月（月份0代表1月）  
		cal.set(Calendar.DATE, 11);//日  
		cal.set(Calendar.HOUR_OF_DAY, 15);//时  
		cal.set(Calendar.MINUTE, 33);//分  
		cal.set(Calendar.SECOND, 32);//秒  
		System.out.println(sdf.format(cal.getTime()));
		
		cal.setTime(new Date());
		System.out.println(sdf.format(cal.getTime()));
		
		cal.add(Calendar.YEAR, 1);//年  
		cal.add(Calendar.MONTH, 1);//月  
		cal.add(Calendar.DATE, 1);//日  
		cal.add(Calendar.HOUR_OF_DAY, -1);//时  
		cal.add(Calendar.MINUTE, 1);//分  
		cal.add(Calendar.SECOND, 1);//秒  
		System.out.println(sdf.format(cal.getTime()));
		
		Calendar calendarNew = Calendar.getInstance();
		calendarNew.add(Calendar.HOUR, -2);  
	    System.out.println("时间比较：" + calendarNew.compareTo(cal));