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

更多内容请见原文，文章转载自：https://blog.csdn.net/qq_44639795/article/details/103123880