Java KeyListener with Delay

Question

I need help implementing a new feature in an existing product that's implemented using JAVA. The new feature would allow users to search for items in a database, and display them in a Jtable. The search criteria will be typed in a textbox, and relevant results should appear in the table accordingly. I can easily create a "Submit" button to submit the search criteria and get the results. But what I really want is to implement a keylistener on the textbox that would wait around 2 seconds before submitting a query. For instance if a user inputs "D" and waits for 1 second, and then inputs "O", the submission of the query would happen 2 seconds after inputting "O" ( renewing the delay time upon each keystroke). Can

Are you sure that you're query is fast enough to handle such things? — RoflcoptrException
– RoflcoptrException, Commented Apr 8, 2011 at 7:36
Even if there were an additional query overhead, what I really care about is waiting for 2 seconds before taking the input from the textbox and display it in my JTable. — Mouhammed Soueidane
– Mouhammed Soueidane, Commented Apr 8, 2011 at 7:51

Tom · Accepted Answer · 2011-04-08 07:53:49Z

3

Try a java.util.Timer, on each key press cancel it and reschedule a TimerTask that's to do your query.

answered Apr 8, 2011 at 7:53

Tom

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4 Comments

Mouhammed Soueidane Over a year ago

Thanks a lot Tom. I will try your suggestion, and give you a feedback once I'm done.

Mouhammed Soueidane Over a year ago

I have tried using the TimerTask and it's working (I'm getting the result after X amount of seconds). But let's say that I have a task that's still waiting for the delay time till it executes, and another task executes during that. How can I cancel the previous task completely so I could only execute the new task? I tried timer.cancel(), but this would disallow me to reuse the Timer class object.

Mouhammed Soueidane Over a year ago

Oh, so you were suggesting to create a timer for every task?

Mouhammed Soueidane Over a year ago

Nevermind, I have done the following logic: void run(){ timer.cancel(); timer=new Timer(); //Business logic goes here } This would cancel the previous timer, and create a new timer for the new task. Thanks for the help everyone =)

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