quartz 时间表达式转换

/**日期和表达式的转化 * @param hour 小时 * @param minute 分钟 * @return */private String makeDailyTrigger(String hour, String minute) {validateHour(Integer.parseInt(hour));        validateMinute(Integer.parseInt(minute));                return  "0 " + minute + " " + hour + " ? * *";}/**验证分钟 * @param minute */private void validateMinute(int minute) {        if (minute < 0 || minute > 59)            throw new IllegalArgumentException(                    "Invalid minute (must be >= 0 and <= 59).");}/**验证小时 * @param hour */private void validateHour(int hour) {        if (hour < 0 || hour > 23)            throw new IllegalArgumentException(                    "Invalid hour (must be >= 0 and <= 23).");}

?从源码中提出来的。。。。。。。。。