puic class TimeProcessor { public TimeProcessor() { } public static String getCurrentTime(String format) { java.util.Date date = new java.util.Date(); return date2String(date, format); } public static java.util.Date string2Date(String dateStr, String format) throws Exception { if (dateStr == null || format == null) { { throw new Exception("日期转换失败:dateStr or format is null"); } } try { SimpleDateFormat dateFormater = new SimpleDateFormat(format); return rse(dateStr); } catch (Exception e) { throw e; } } } String nineTime = new StringBuffer(TimeProcessor .getCurrentTime("yyyyMMdd")).append("090000").toString(); Date nineDate = ring2Date(nineTime, "yyyyMMddHHmmss"); String currentTime = tCurrentTime(); Date currentDate = ring2Date(currentTime, "yyyyMMddHHmmss"); Calendar nineCalendar = tInstance(); Calendar currentCalendar = tInstance(); tTime(nineDate); tTime(currentDate); //进行早上9点操作判断 if( fore(nineCalendar)) { // do your work }else { }