package com.xuyigang1234.chp05.sec01;

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


public class TestSimpleDateFormat {
    
    /**
      * 將日期物件格式化為指定格式的日期字串
     * @param date 傳入的日期物件
     * @param format 格式
     * @return
     */
    public static String formateDate(Date date,String geshi) {
        String result
 
="";
        SimpleDateFormat sdf= new SimpleDateFormat(geshi);
        if(date !=null) {
            result=sdf.format(date);            
        }
        return result;    
    }
    /**
             * 將日期字串轉換成一個日期物件 
     * @param dateStr 日期字串
     * @param format 格式
     * @return
     * @throws
 
 ParseException 
     */
    public static Date formateD(String dateStr,String geshi) throws ParseException {
        SimpleDateFormat sdf= new SimpleDateFormat(geshi);
        return sdf.parse(dateStr);
    }
    public static void main(String[] args) throws ParseException {
        Date date= new Date();
        SimpleDateFormat sdf
 
= new SimpleDateFormat("yyyy-MM-dd");
        String date1 = sdf.format(date);
        System.out.println(date1);
        //formateDate
        String date2 = formateDate(date,"yyyy-MM-dd HH:mm:ss");
        System.out.println(date2);
        //parse
        String dataStr="1989-11-02 18:01:41";
        Date date3 = formateD(dataStr,"yyyy-MM-dd HH:mm:ss");
        System.out.println(formateDate(date3,"yyyy-MM-dd HH:mm:ss"));
    }
}

輸出：
  2018-11-22
2018-11-22 22:31:19
1989-11-02 18:01:41