java時間比較工具類分享

開發中常常須要比較時間，寫了一個簡易的工具類，分享一下：

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package com.ijiuyuan.common.utils;   import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date;     public class DiffTime {      public static void main(String[] args){                    SimpleDateFormat sdf= new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );          Date startTime = null ;          Date endTime = null ;          try {              startTime = sdf.parse( "2014-06-24 10:19:40" );              endTime=sdf.parse( "2014-06-16 10:19:40" );          } catch (ParseException e) {              // TODO Auto-generated catch block              e.printStackTrace();          }                    long nd = 1000 * 24 * 60 * 60 ; // 一天的毫秒數          long md = 1000 * 1 * 1 * 60 ; // 分鐘的毫秒數          long sd = 1000 * 1 * 1 * 1 ; // 毫秒數          long diff =startTime.getTime()- new Date().getTime() ;                    long day = diff / nd; // 計算差多少天          long minute=diff/md;          long second=diff/sd;          System.out.println(second);          if (diff>=nd* 7 ){              System.out.println( "預備中:" +second);          }                    long endday = (endTime.getTime()- new Date().getTime()) / md; // 計算差多少天                              System.out.println(endday);                    if (day <= 7 && day >= 0 ) {                                          if (minute>= 0 )                  System.out.println( "即將開始" );              else {                  System.out.println( "已結束" );              }          } else if (day > 7 ) {              System.out.println( "預備中" );          } else {              System.out.println( "已結束" );          }      }      /**       * 時間比較       * <p>       * 若是第一個時間大於第二時間返回1<br/>       * 等於返回0<br/>       * 小於返回-1       * </p>       * @param firstTime       * @param secondTime       * @return       */      public static int compare(Date firstTime,Date secondTime){          long diff =firstTime.getTime()- secondTime.getTime() ;          if (diff> 0 ){              return 1 ;          } else if (diff== 0 ){              return 0 ;          } else {              return - 1 ;          }      }      /**       * 是否值過大       * @param firstTime       * @return       */      public static boolean isTooLarge(Date firstTime){          Calendar calendar=Calendar.getInstance();          calendar.setTime( new Date());          calendar.add(Calendar.YEAR, 1000 );          Date bigDate=calendar.getTime();          if (compare(firstTime, bigDate)> 0 ){              return true ;          } else {              return false ;          }      } }