java.awt.event.MouseAdapter with a loop so slowly

Question

I am developing a program by using JFrame and i want to realize that when you click on a button, a loop in a other class has to work. It is working but so slowly. In one second you can see just one iteration of the loop. I dont understand why. There are pieces of codes you need to know. Calling listener:

playWithComputerButton.addMouseListener(new java.awt.event.MouseAdapter() {
        public void mouseClicked(java.awt.event.MouseEvent evt) {
            startLoop(1);
        }
    });

called piece:

if(gameMode == 2){
        int i = 0;
        while(i < 500){
            int pos = ((Computer) playerA).thinkIt(board.getBoard());
            display("bu pas : " + pos);
            i++;
        }

There is no problem with iteration and calling listener. (i have tried it also with other iterations and 'ActionListener' but the result is same.

What can be the solution?

You need to use `SwingWorker` to perform long operations not related to GUI — Nikolay Kuznetsov, Dec 14 '12 at 05:11
I'd suggest having a quick read this [answer](http://stackoverflow.com/questions/13870982/updating-swing-components-correctly/13871140#13871140), while it's not a direct answer, it will highlight the problems you are having and why Nikolay's answer is actual correct — MadProgrammer, Dec 14 '12 at 05:33
_There are pieces of codes you need to know._ Rather than pieces, please edit your question to include an [sscce](http://sscce.org/) that focuses on the problem. Several examples are cited [here](http://stackoverflow.com/a/8237370/230513). — trashgod, Dec 14 '12 at 10:35
it was preciesly what i was looking for. It is now working without any slowness! Thank you Nikolay and Madprogrammer. @trashgod, thank you for your feedback. i'll do it. — AsqaN, Dec 14 '12 at 14:49

score 0 · Accepted Answer · edited May 23 '17 at 11:57

To perform long operations not related to GUI, we can simply make use of javax.swing.SwingWorker, as Nikolay Kuznetsov and MadProgrammer explained above.

Here is a example of how to use it: example and here is the javadoc of SwingWorker: javadoc

in case of my program, the solution is:

Firstly create a new SwingWorker extending class in your JFrame class

class LoopWorker extends SwingWorker<Integer, Integer>
{
    protected Integer doInBackground() throws Exception
    {
        // perform your loop
    }

    protected void done()
    {
        // what has to be done after performing
    }
}

Then, the button should call its execute method as follow:

learnButton.addActionListener(new ActionListener() {

        public void actionPerformed(ActionEvent evt) {
            new LoopWorker().execute();
        }
     });

java.awt.event.MouseAdapter with a loop so slowly

1 Answers1