JavaCalendar 类时间操作,这也许是创建和管理日历最简单的一个方案,示范代码很简单。
演示了获取时间,日期时间的累加和累减,以及比较。
原文地址:blog.csdn.NET/joyous/article/details/9630893
注意事项:
Calendar 的 month 从 0 开始,也就是全年 12 个月由 0 ~ 11 进行表示。
而 Calendar.DAY_OF_WEEK 定义和值如下:
Calendar.SUNDAY = 1
Calendar.MONDAY = 2
Calendar.TUESDAY = 3
Calendar.WEDNESDAY = 4
Calendar.THURSDAY = 5
Calendar.FRIDAY = 6
Calendar.SATURDAY = 7SimpleDateFormat 的格式定义
Letter Date or Time Component Presentation Examples G
Era designator Text AD
y
Year Year 1996
;96
Y
Week year Year 2009
;09
M
Month in year (context sensitive) Month July
;Jul
;07
L
Month in year (standalone form) Month July
;Jul
;07
w
Week in year Number 27
W
Week in month Number 2
D
Day in year Number 189
d
Day in month Number 10
F
Day of week in month Number 2
E
Day name in week Text Tuesday
;Tue
u
Day number of week (1 = Monday, ..., 7 = Sunday) Number 1
a
Am/pm marker Text PM
H
Hour in day (0-23) Number 0
k
Hour in day (1-24) Number 24
K
Hour in am/pm (0-11) Number 0
h
Hour in am/pm (1-12) Number 12
m
Minute in hour Number 30
s
Second in minute Number 55
S
Millisecond Number 978
z
Time zone General time zone Pacific Standard Time
;PST
;GMT-08:00
Z
Time zone RFC 822 time zone -0800
X
Time zone ISO 8601 time zone -08
;-0800
;-08:00
JavaCalendar 演示代码如下:
[java]view plaincopy- packagedemo;
- importjava.util.Date;
- importjava.text.SimpleDateFormat;
- importjava.text.DateFormat;
- importjava.text.ParseException;
- importjava.util.Calendar;
- publicclassTest
- {
- publicTest()
- {
- }
- publicstaticvoidmain(String[]args)
- {
- //字符串转换日期格式
- //DateFormatfmtDateTime=newSimpleDateFormat("yyyy-MM-ddHH:mm:ss");
- //接收传入参数
- //StringstrDate=args[1];
- //得到日期格式对象
- //Datedate=fmtDateTime.parse(strDate);
- //完整显示今天日期时间
- Stringstr=(newSimpleDateFormat("yyyy-MM-ddHH:mm:ss:SSS")).format(newDate());
- System.out.println(str);
- //创建Calendar对象
- Calendarcalendar=Calendar.getInstance();
- try
- {
- //对calendar设置时间的方法
- //设置传入的时间格式
- SimpleDateFormatdateFormat=newSimpleDateFormat("yyyy-M-dH:m:s");
- //指定一个日期
- Datedate=dateFormat.parse("2013-6-113:24:16");
- //对calendar设置为date所定的日期
- calendar.setTime(date);
- //按特定格式显示刚设置的时间
- str=(newSimpleDateFormat("yyyy-MM-ddHH:mm:ss:SSS")).format(calendar.getTime());
- System.out.println(str);
- }
- catch(ParseExceptione)
- {
- e.printStackTrace();
- }
- //或者另一種設置calendar方式
- //分別爲year,month,date,hourOfDay,minute,second
- calendar=Calendar.getInstance();
- calendar.set(2013,1,2,17,35,44);
- str=(newSimpleDateFormat("yyyy-MM-ddHH:mm:ss:SSS")).format(calendar.getTime());
- System.out.println(str);
- //Calendar取得当前时间的方法
- //初始化(重置)Calendar对象
- calendar=Calendar.getInstance();
- //或者用Date来初始化Calendar对象
- calendar.setTime(newDate());
- //setTime类似上面一行
- //Datedate=newDate();
- //calendar.setTime(date);
- str=(newSimpleDateFormat("yyyy-MM-ddHH:mm:ss:SSS")).format(calendar.getTime());
- System.out.println(str);
- //显示年份
- intyear=calendar.get(Calendar.YEAR);
- System.out.println("yearis="+String.valueOf(year));
- //显示月份(从0开始,实际显示要加一)
- intmonth=calendar.get(Calendar.MONTH);
- System.out.println("nthis="+(month+1));
- //本周几
- intweek=calendar.get(Calendar.DAY_OF_WEEK);
- System.out.println("weekis="+week);
- //今年的第N天
- intDAY_OF_YEAR=calendar.get(Calendar.DAY_OF_YEAR);
- System.out.println("DAY_OF_YEARis="+DAY_OF_YEAR);
- //本月第N天
- intDAY_OF_MONTH=calendar.get(Calendar.DAY_OF_MONTH);
- System.out.println("DAY_OF_MONTH="+String.valueOf(DAY_OF_MONTH));
- //3小时以后
- calendar.add(Calendar.HOUR_OF_DAY,3);
- intHOUR_OF_DAY=calendar.get(Calendar.HOUR_OF_DAY);
- System.out.println("HOUR_OF_DAY+3="+HOUR_OF_DAY);
- //当前分钟数
- intMINUTE=calendar.get(Calendar.MINUTE);
- System.out.println("MINUTE="+MINUTE);
- //15分钟以后
- calendar.add(Calendar.MINUTE,15);
- MINUTE=calendar.get(Calendar.MINUTE);
- System.out.println("MINUTE+15="+MINUTE);
- //30分钟前
- calendar.add(Calendar.MINUTE,-30);
- MINUTE=calendar.get(Calendar.MINUTE);
- System.out.println("MINUTE-30="+MINUTE);
- //格式化显示
- str=(newSimpleDateFormat("yyyy-MM-ddHH:mm:ss:SS")).format(calendar.getTime());
- System.out.println(str);
- //重置Calendar显示当前时间
- calendar.setTime(newDate());
- str=(newSimpleDateFormat("yyyy-MM-ddHH:mm:ss:SS")).format(calendar.getTime());
- System.out.println(str);
- //创建一个Calendar用于比较时间
- CalendarcalendarNew=Calendar.getInstance();
- //设定为5小时以前,后者大,显示-1
- calendarNew.add(Calendar.HOUR,-5);
- System.out.println("时间比较:"+calendarNew.compareTo(calendar));
- //设定7小时以后,前者大,显示1
- calendarNew.add(Calendar.HOUR,+7);
- System.out.println("时间比较:"+calendarNew.compareTo(calendar));
- //退回2小时,时间相同,显示0
- calendarNew.add(Calendar.HOUR,-2);
- System.out.println("时间比较:"+calendarNew.compareTo(calendar));
- }
- }
- SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-ddHH:mm:ss:SSS");
- /*初始化*/
- Calendarcal=Calendar.getInstance();
- intyear=cal.get(Calendar.YEAR);//年
- intmonth=cal.get(Calendar.MONTH)+1;//月
- intday=cal.get(Calendar.DATE);//日
- inthour=cal.get(Calendar.HOUR_OF_DAY);//时
- intminute=cal.get(Calendar.MINUTE);//分
- intsecond=cal.get(Calendar.SECOND);//秒
- intweekday=cal.get(Calendar.DAY_OF_WEEK);//星期周日-周六对应1-7
- intlast=cal.getActualMaximum(cal.DAY_OF_MONTH);//获取本月最大天数
- intDAY_OF_YEAR=cal.get(Calendar.DAY_OF_YEAR);//今年的第几天
- intDAY_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"+" weekday:"+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(newDate());
- 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()));
- CalendarcalendarNew=Calendar.getInstance();
- calendarNew.add(Calendar.HOUR,-2);
- System.out.println("时间比较:"+calendarNew.compareTo(cal));
Java Calendar使用总结
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