Java中Calendar的使用方法

package Date;

import java.util.Calendar;
import java.util.Date;

public class CalendarDemo {
public static void main(String[] args) {
Calendar calendar=Calendar.getInstance();
calendar.setTime(new Date());
System.out.println("现在时间是："+new Date());
String year=String.valueOf(calendar.get(Calendar.YEAR));
String month=String.valueOf(calendar.get(Calendar.MONTH)+1);
String day=String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));
String week=String.valueOf(calendar.get(Calendar.DAY_OF_WEEK)-1);
System.out.println("现在时间是："+year+"年"+month+"月"+day+"日，星期"+week);
long year2009=calendar.getTimeInMillis();
calendar.set(1989,9,26);//这里与真实的月份之间相差1
long year1989=calendar.getTimeInMillis();
long days=(year2009-year1989)/(1000*60*60*24);
System.out.println("今天和1989年10月26日相隔"+days+"天，"+"也就是说我在这个美丽的星球上已经幸福的生活了"+days+"天。");

}

}