java中如何按一定的格式输出时间， 必须给出例子

题目2： 按一定的格式输出时间

import java.util.*;

import java.text.SimpleDateFormat;

public class Test {

    public static void main(String[] args) {

        Date date = new Date();//获取当前日期

        SimpleDateFormat df = new SimpleDateFormat("yyyy-MMM-dd kk:mm:ss a");

        System.out.println(df.format(date));//按yyyy-MMM-dd kk:mm:ss a这个格式来格式化date

        SimpleDateFormat df1 = new SimpleDateFormat(

                "yyyyy.MMMMM.dd GGG hh:mm aaa");

        System.out.println(df1.format(date));//按yyyyy.MMMMM.dd GGG hh:mm aaa这个格式来格式化date，格式参见下表

    }

}

后记：有关yyyy-MMM-dd kk:mm:ss a是什么意思，可以参考SimpleDateFormat的api文档：k: Hour in day (1-24)

Letter Date or Time Component Presentation Examples

G Era designator Text AD

y Year Year 1996; 96

M Month in year Month July; Jul; 07

w Week in year Number 27

W Week in month Number 2

D Day in year Number 189

d Day in month Number 10

F Day of week in month Number 2

E Day in week Text Tuesday; Tue

a Am/pm marker Text PM

H Hour in day (0-23) Number 0

k Hour in day (1-24) Number 24

K Hour in am/pm (0-11) Number 0

h Hour in am/pm (1-12) Number 12

m Minute in hour Number 30

s Second in minute Number 55

S Millisecond Number 978

z Time zone General time zone Pacific Standard Time; PST; GMT-08:00

Z Time zone RFC 822 time zone -0800

更多请看：https://blog.csdn.net/qq_44639795/article/details/103123880