我有两个时间值。一个用于previous登录时间和一个用于当前登录时间。 我有一个小时，以增加previous时间登录。我已经使用的日期格式为hh：mm：ss的。 这是我的code段。

 日期previous_time，CURRENT_TIME;

  如果（previous_time.before（CURRENT_TIME））{
  Log.i（时间比较，真）;
 }
 

所以，而不是上面提到的条件的话，我一小时增加至previous_time并执行，如果条件。如何实现这一目标？

 台历挂历= Calendar.getInstance（）;
   calendar.setTime（previous_time）;
   calendar.add（Calendar.HOUR，1）;
   previous_time = calendar.getTime（）;
   //做你的比较
 

I have two time values. one for the previous login time and one for the current login time. I have to increase previous time login by one hour. I have used the date format hh:mm:ss. This is my code snippet.

Date previous_time, current_time;

  if(previous_time.before(current_time)){
  Log.i("Time Comparision"," true");
 }

so instead of the above mentioned if condition, I have to add one hour to the previous_time and do the if condition. How to achieve this?

   Calendar calendar = Calendar.getInstance();
   calendar.setTime(previous_time);
   calendar.add(Calendar.HOUR, 1);
   previous_time = calendar.getTime();
   // do your comparison