Calendar的add()方法介绍 .
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- public static Date addYears(Date date, int amount)
- {
- return add(date, 1, amount);
- }
- public static Date addMonths(Date date, int amount)
- {
- return add(date, 2, amount);
- }
- public static Date addWeeks(Date date, int amount)
- {
- return add(date, 3, amount);
- }
- public static Date addDays(Date date, int amount)
- {
- return add(date, 5, amount);
- }
- public static Date addHours(Date date, int amount)
- {
- return add(date, 11, amount);
- }
- public static Date addMinutes(Date date, int amount)
- {
- return add(date, 12, amount);
- }
- public static Date addSeconds(Date date, int amount)
- {
- return add(date, 13, amount);
- }
- public static Date addMilliseconds(Date date, int amount)
- {
- return add(date, 14, amount);
- }
- private static Date add(Date date, int calendarField, int amount)
- {
- if(date == null)
- {
- throw new IllegalArgumentException("The date must not be null");
- } else
- {
- Calendar c = Calendar.getInstance();
- c.setTime(date);
- c.add(calendarField, amount);
- return c.getTime();
- }
- }
我在一个测试类中测试了一下,如果是1则代表的是对年份操作,2是对月份操作,3是对星期操作,5是对日期操作,11是对小时操作,12是对分钟操作,13是对秒操作,14是对毫秒操作。
http://fightingyanping.blog.163.com/blog/static/11657270320132411817281/