JAVA日期字符串相互转换

public static void main(String[] args) {

        //1.日期转字符串
        Date date = new Date();
        String strDateFormat = "yyyy-MM-dd HH:mm:ss";
        SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
        System.err.println(sdf.format(date)); 
        
        //2.字符串转日期
        try {
            Date dateDate = sdf.parse("2021-03-30 10:17:04");
            System.err.println(dateDate);   
        } catch (ParseException e) {
            e.printStackTrace();
        }

    }