I love the java series --- [date] Conversion Tools

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Tools Code:

public class DateUtil {

    /***
     * 从yyyy-MM-dd HH:mm格式转成yyyyMMddHH格式
     * @param dateStr
     * @return
     */
    public static String formatStr(String dateStr){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        try {
            Date date = simpleDateFormat.parse(dateStr);
            simpleDateFormat = new SimpleDateFormat("yyyyMMddHH");
            return simpleDateFormat.format(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

    /***
     * 获取指定日期的凌晨
     * @return
     */
    public static Date toDayStartHour(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        Date start = calendar.getTime();
        return start;
    }


    /***
     * 时间增加N分钟
     * @param date
     * @param minutes
     * @return
     */
    public static Date addDateMinutes(Date date,int minutes){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MINUTE, minutes);// 24小时制
        date = calendar.getTime();
        return date;
    } 

    / ** * 
     * hour time increments N 
     * @param hour 
     * @return 
     * / 
    public  static a Date addDateHour (a Date DATE, int hour) { 
        Calendar Calendar = Calendar.getInstance (); 
        calendar.setTime (DATE); 
        Calendar.add (Calendar.HOUR, hour); // 24-hour 
        DATE = calendar.getTime ();
         return DATE; 
    } 

    / ** * 
     * menu acquisition time 
     * @return 
     * / 
    public  static List <a Date> getDateMenus () {
         //Defines a List <Date> set, all storage period 
        List <Date> = a dates new new the ArrayList <a Date> ();
         // cycle 12 times 
        a Date DATE = toDayStartHour ( new new a Date ()); // morning 
        for ( int I = 0; I <12 is; I ++ ) {
             // incremented each time for 2 hours, to save time in each increment of List <Date> set 
            dates.add (addDateHour (DATE, I * 2 )); 
        } 

        // Analyzing time range to which the current time belongs to 
        a Date now = new new a Date ();
         for (a Date CDate: a dates) {
             // begin time <= current time <start time +2 hours 
            if(cdate.getTime()<=now.getTime() && now.getTime()<addDateHour(cdate,2).getTime()){
                now = cdate;
                break;
            }
        }

        //当前需要显示的时间菜单
        List<Date> dateMenus = new ArrayList<Date>();
        for (int i = 0; i <5 ; i++) {
            dateMenus.add(addDateHour(now,i*2));
        }
        return dateMenus;
    }

    /***
     * 时间转成yyyyMMddHH
     * @param date
     * @return
     */
    public static String date2Str(Date date){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMddHH");
        return simpleDateFormat.format(date);
    }
}