格式化代码如下:
package com.itheima_01;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class SimpleDateFormatDemo {
public static void main(String[] args) throws ParseException {
Date d = new Date();
// SimpleDateFormat sdf = new SimpleDateFormat();//使用默认模式显示日期2019/8/24 下午2:49
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss"); //2019年08月24日 02:54:09
String s = sdf.format(d);
System.out.println(s);
System.out.println("-----------------------------");
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
String ss = new String("2019-09-09 14:25:24");
Date time = sdf2.parse(ss);
System.out.println(time);
}
}
下面是一个将类和测试类分开 并且分别将格式化日期和解析字符串为日期的案例
日期工具类代码:
package com.Test01; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class DateUtils { private DateUtils() {} //将日期格式化成字符串 public static String dateToString(Date date,String format) { SimpleDateFormat sdf1 = new SimpleDateFormat(format); String s1 = sdf1.format(date); return s1; } //将字符串解析成日期 public static Date stringToDate(String s,String format) throws ParseException { SimpleDateFormat sdf2 = new SimpleDateFormat(format); Date t1 = sdf2.parse(s); return t1; } }
测试类
package com.Test01; import java.text.ParseException; import java.util.Date; import static com.Test01.DateUtils.dateToString; import static com.Test01.DateUtils.stringToDate; public class DateDemo { public static void main(String[] args) throws ParseException { Date d1 = new Date(); String format1 = "yyyy年MM月dd日 hh:mm:ss"; String s = dateToString(d1, format1); System.out.println(s); System.out.println("----------------------"); String a = "1996-09-13 12:00:00"; String format2 = "yyyy-MM-dd hh:mm:ss"; Date d2 = stringToDate(a,format2); System.out.println(d2); } }