java获取本月开始的一天与最后一天

/*** 获取本月第一天
     * @return
     */
    publicDate getmindate(){
        Calendar calendar =Calendar.getInstance();
        calendar.setTime(newDate());
        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
        
        returncalendar.getTime();
    }

    /*** 获取本月最后一天
     * @return
     */
    publicDate getmaxdate(){
        Calendar calendar2 =Calendar.getInstance();
        calendar2.setTime(newDate());
        calendar2.set(Calendar.DAY_OF_MONTH, calendar2.getActualMaximum(Calendar.DAY_OF_MONTH));
        returncalendar2.getTime();
    }