Date日期与Calendar日期的隐藏区别
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{
//将日期转换为指定格式输出
Date date = new Date();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-mm-dd HH:MM:SS");
String date1 = simpleDateFormat.format(date);
System.out.println(date1);
//字符串日期转换成日期格式输出
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()); //每刷新一次时间秒数会发生对应的改变 Date类构建的日期的秒数不变
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("当前时间："+year + "-" + month+"-" + day +" "+ hour+":" + minute+":"+second);
System.out.println(c.getTimeInMillis());
}
}控制台打出：
2016-24-03 11:03:490 Thu Mar 03 11:24:00 CST 2016 Thu Mar 03 11:24:51 CST 2016 当前时间：2016-2-3 11:24:51 1456975491505
结论 ：
Calendar每刷新一次时间的秒数会发生对应的改变 Date类构建的日期的秒数不变
