java计算时间差的方法

/*** 计算时间差* @param begin* @param end* @return 返回格式,"hh:mm:ss"*/public String getTimeDifference(Date begin,Date end) {  long between=(end.getTime()-begin.getTime())/1000;  //除以1000是为了转换成秒  long hour=between%(24*3600)/3600;  long minute=between%3600/60;  long second=between%60;  StringBuffer time=new StringBuffer();  if(hour!=0){   time.append(hour+":");  }  if(time.length()!=0){   time.append(String.format("%02d:", minute));  }else if(minute!=0){   time.append(String.format("%d:", minute));  }  if(time.length()!=0){   time.append(String.format("%02d", second));  }else{   time.append(second);  }  return time.toString();}