1.Calender和Date相互转化
public static void main(String[] args) {
// TODO Auto-generated method stub
Calendar calendar = Calendar.getInstance(); //
System.out.println(calendar.getTime()); // 实际上是调用Date
date=new Date()
calendar.setTime(new Date());
System.out.println(calendar.getTime());
}
2.Calendar的基本用法：
public static void main(String[] args) {
// TODO Auto-generated method stub
Calendar calendar = Calendar.getInstance(); //获取calendar实例
System.out.println(calendar.get(Calendar.YEAR)); //分别输出calendar中的年月日
System.out.println(calendar.get(Calendar.MONTH));
System.out.println(calendar.get(Calendar.DATE));
calendar.set(2011, 1, 3); //设置calendar的时间
System.out.println(calendar.getTime()); //输出设置后的时间
calendar.add(calendar.MONTH, 13); //用add加，超过的单位会进一
System.out.println(calendar.getTime());
calendar.roll(calendar.MONTH, 13); //roll加，超过的单位不会进一
System.out.println(calendar.getTime());
}
result：
2013
11
15
Thu Feb 03 00:15:22 CST 2011
Sat Mar 03 00:15:22 CST 2012
Tue Apr 03 00:15:22 CST 2012
3.Calendar的容错性
public static void main(String[] args) {
// TODO Auto-generated method stub
Calendar calendar = Calendar.getInstance(); //获取calendar实例
calendar.set(calendar.MONTH,12); //超过的部分在上一级加一（11+12）在year++
System.out.println(calendar.getTime()); //正常
calendar.setLenient(false); //关闭容错性,11+12在month的范围之外，判断错误
calendar.set(calendar.MONTH , 12);
System.out.println(calendar.getTime()); //错误
}
4.set方法的延迟修改
public static void main(String[] args) {
// TODO Auto-generated method stub
Calendar calendar = Calendar.getInstance(); //获取calendar实例
calendar.set(2013, 7, 31); //month计数从0开始，所以是2013-08-31
System.out.println(calendar.getTime());
calendar.set(calendar.MONTH, 8); //设置为9月：2013-9-？ set延迟效应，具体时间还没确定，出现get时才确认
// System.out.println(calendar.getTime()); //这时get，那么为2013-10-01 因为没有2013-09-31
calendar.set(calendar.DATE, 5); //如果上述get没有，这里就是设置date 为5
System.out.println(calendar.getTime()); //这时两个set起作用 2013-09-05
}