java.util.Calendar的MilliSecond域表示1/1000秒，理论取值范围是0-999。Calendar提供
set(int field, int value)
方法可以对Calendar的各个域进行设置，设置MilliSecond域可以这样做：set(Calendar.MILLISECOND, 234)。一般value为0-999中的一个值，但如果将一个大于或等于1000的值传入以上调用会有什么结果呢？看以下代码就清楚了。
代码：
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package com.leo.testcalendar;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss.SSS”);
Calendar calendar = Calendar.getInstance();
System.out.println(“1.Origin”);
calendar.set(2009, Calendar.SEPTEMBER, 1, 0, 0, 0);
System.out.println(“Calendar is : ” + format.format(calendar.getTime()));
System.out.println(“MilliSecond is: ” + calendar.get(Calendar.MILLISECOND));
System.out.println();
System.out.println(“2.Set MilliSecond to 456”);
calendar.set(Calendar.MILLISECOND, 456);
System.out.println(“Calendar is : ” + format.format(calendar.getTime()));
System.out.println(“MilliSecond is: ” + calendar.get(Calendar.MILLISECOND));
System.out.println();
System.out.println(“3.Set MilliSecond to 1000”);
calendar.set(Calendar.MILLISECOND, 1000);
System.out.println(“Calendar is : ” + format.format(calendar.getTime()));
System.out.println(“MilliSecond is: ” + calendar.get(Calendar.MILLISECOND));
System.out.println();
System.out.println(“4.Set MilliSecond to 2222”);
calendar.set(Calendar.MILLISECOND, 2222);
System.out.println(“Calendar is : ” + format.format(calendar.getTime()));
System.out.println(“MilliSecond is: ” + calendar.get(Calendar.MILLISECOND));
System.out.println();
System.out.println(“5.Set Second to 70”);
calendar.set(Calendar.SECOND, 70);
System.out.println(“Calendar is : ” + format.format(calendar.getTime()));
System.out.println(“Second is: ” + calendar.get(Calendar.SECOND));
System.out.println();
System.out.println(“6.Print Long type value of Calendar”);
System.out.println(“Long type value of Calendar is : ” + calendar.getTime().getTime());
}
}
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结果
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1.Origin
Calendar is : 2009-09-01 00:00:00.847
MilliSecond is: 847
2.Set MilliSecond to 456
Calendar is : 2009-09-01 00:00:00.456
MilliSecond is: 456
3.Set MilliSecond to 1000
Calendar is : 2009-09-01 00:00:01.000
MilliSecond is: 0
4.Set MilliSecond to 2222
Calendar is : 2009-09-01 00:00:03.222
MilliSecond is: 222
5.Set Second to 70
Calendar is : 2009-09-01 00:01:10.222
Second is: 10
6.Print Long type value of Calendar
Long type value of Calendar is : 1251763270222
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结论：
由于在java中，时间相关的类型最终存储在Long型中，而MilliSecond在其中仅占用最后3位，如果在设置MilliSecond时，超出了3位数的范围，那么会继续占用其他域的位。所以，在调用set(Calendar.MILLISECOND, value)时，除非明确知道自己的意图，否则，不用使用超出理论范围的值去设置MILLISECOND。对于其他的域也同样适用，如结果中的第5点。