总结：时间类Calendar.类代表当前时

Calendar c=Calendar.getInstance();,，Calendar是抽象类。Calendar的构造方法是私有的，API提供了getIntstance方法来创建的对象，

使用该方法获得的Date对象就代表当前系统时间，

package com.aaaaaaaaaaaaaaaaaaaa;import java.util.*;public class time {	public static void main(String[] args) {		Calendar c = Calendar.getInstance();		int year = c.get(Calendar.YEAR);		int month = c.get(Calendar.MONTH) + 1;		int date = c.get(Calendar.DATE);		int hour = c.get(Calendar.HOUR_OF_DAY);		int second = c.get(Calendar.SECOND);		int minute = c.get(Calendar.MINUTE);		System.out.println("年份：" + year);		System.out.println("月份：" + month);		System.out.println("日期" + date);		System.out.println("小时：" + hour);		System.out.println("分钟：" + minute);		System.out.println("秒" + second);	}}年份：2013月份：11日期30小时：8分钟：39秒51