package?com.abstracted.demo;

import?java.text.ParseException;
import?java.text.SimpleDateFormat;
import?java.util.Calendar;
import?java.util.Date;

public?class?Datetest?{
	public?static?void?main(String?[]args)?throws?ParseException{
	//將日期轉(zhuǎn)換為指定格式輸出
???Date?date?=?new?Date();
???SimpleDateFormat?simpleDateFormat?=?new?SimpleDateFormat("yyyy-mm-dd?HH:MM:SS");
???String?date1?=?simpleDateFormat.format(date);
???System.out.println(date1);
???//字符串日期轉(zhuǎn)換成日期格式輸出
???SimpleDateFormat?simpleDateFormat1?=?new?SimpleDateFormat("yyyy-mm-dd?HH:MM:SS");?
???Date?date2?=simpleDateFormat1.parse(date1);
???System.out.println(date2);
???
???
???
???Calendar??c?=?Calendar.getInstance();
???System.out.println(c.getTime());??//每刷新一次時(shí)間秒數(shù)會(huì)發(fā)生對(duì)應(yīng)的改變?Date類構(gòu)建的日期的秒數(shù)不變
???int?year?=?c.get(Calendar.YEAR);
???int?month?=?c.get(Calendar.MONTH);
???int?day?=?c.get(Calendar.DAY_OF_MONTH);
???int?hour?=?c.get(Calendar.HOUR);
???int?minute?=?c.get(Calendar.MINUTE);
???int?second?=?c.get(Calendar.SECOND);
???System.out.println("當(dāng)前時(shí)間："+year?+?"-"?+?month+"-"?+?day?+"?"+?hour+":"?+?minute+":"+second);
???System.out.println(c.getTimeInMillis());

	}
}

控制臺(tái)打出：

2016-24-03?11:03:490
Thu?Mar?03?11:24:00?CST?2016
Thu?Mar?03?11:24:51?CST?2016
當(dāng)前時(shí)間：2016-2-3?11:24:51
1456975491505

結(jié)論 ：

Calendar每刷新一次時(shí)間的秒數(shù)會(huì)發(fā)生對(duì)應(yīng)的改變 Date類構(gòu)建的日期的秒數(shù)不變