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How to create a event reminder. Example, an user created an event which is today 5.00pm and stored it into database. When ruun the program the reminder will pop up if the system time is 5.00pm. Is there any API can do that? From google what I got was those freeware.
Assuming you use Date to represent the time you want to fire the alert, schedule a custom Callable task in a ScheduledExecutorService.
Ths code would look like this:
myScheculer.schedule(alertTime.getTime() - System.currentTimeMillis(), new AlertTask());
In the AlertTask implementation, use JOptionPane.showMessage() to pop the notification.
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I'm looking an API for video and audio calling which is free and it can handle huge amount of user.
I have try ZegoCloud, VideoSDk, Agora.io all are paid after a certain limit.
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In a recent interview with Amazon I have been rejected because I could not tell the advantage and disadvantage of making model and Entity classes different and same.
I have always created Model and Entity class same.
Can anybody help me on that with an example? Interviewer said you are making strong binding of UI+DB if you are keeping it same.
It's true by making same class for Entity and Model you are tightly binding UI and DB, simple example of why should avoid is -> most of the time, we modify response like adding DTO, modifying format of date and so on. which could impact your database calls (DTO layer).you can read more here
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I'm trying to solve the following problem:
I have some expensive work to do which I then cache the result of
The work is keyed by a string
Many requests may arrive simultaneously for the same key
I'd like to avoid doing the work more than once per key
I'd like to add callbacks against the key which will be invoked when the work is completed; not all of these are known when the work is first submitted.
This feels like a problem which ought to have been solved already; does anybody know of a Java framework or library which covers it?
I can imagine a wrapper around guava's LoadingCache but I'm not aware of a library which does everything out of the box.
While LoadingCache#get is synchronous, it does get you 1-4 and there may be some mileage in using refresh which can return a ListenableFuture (although to get all the features you list it might become a fairly chunky wrapper?)
For Reference:
http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/cache/LoadingCache.html#refresh(K)
http://www.theotherian.com/2013/11/non-blocking-cache-with-guava-and-listenable-futures.html
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I have a table in my database. I am using jdbc to use this database. I want to update a particular data by subtracting it to some value.
Suppose a student with name xyz is there. Currently his marks in a subject is 50. I want to delete it by 10, then what would be the syntax? I am new to SQL.
More or less:
update students
set mark = mark - 10
where name = 'xyz'
Can't give a better answer than that, as your question is very limited in useful and concrete information. I'm sure you'll figure it out.
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I want to compare the 2 images(images of people)and want a result that these are of same person or not(By Face recognization).I have to do this for millions of images so I cannot do it manually .Is there any api for android that can be used in my app.
You could use Camera.Face or FaceDetector.Face class. Take parameters of face on both photos and compare their parameters using e.g. eyesDistance(). If those parameters quite the same -> its the same person.