Start another thread after SwingWorker completes in Java

Question

I know there many questions on SO but non of them has good enough answer and before asking here I googled a lot specially SO but nothing could make it clear. I just simply wants to start my other thread when my SwingWorker finish its work.

I want to start a timer when the SwingWorker finishes it's work but cannot figure out how.

class createGUI extends SwingWorker<Void, Void>
{
    @Override
    protected Integer doInBackground() throws Exception
    {
         //Some long processing
    }

    @Override
    protected void done()
    {
         //Doing GUI work here
         prgBar.setInderminent(false);
    }
}

//Starts a progressBar and calls createGUI();
prgBar.setInderminent(true);
new createGUI().execute();

Now there is another startTimer Thread which I want to start when this SwingWork finishes.

public class startTimer implements Runnable
{
     @Override
     public void run()
     {
         while(true)
         {
             Thread.sleep(1000);
             //Update Database
         }
     }
}

But I don't understand how can I do so?

Answer 1

Unless I'm missing something, you could pass a reference in the constructor to createGUI and start that when done().

class createGUI extends SwingWorker<Void, Void>
{
  private Thread startTimer;
  public createGUI(Thread startTimer) {
    this.startTimer = startTimer;
  }
  @Override
  protected Integer doInBackground() throws Exception {
     //Some long processing
  }

  @Override
  protected void done()
  {
     //Doing GUI work here
     prgBar.setInderminent(false);
     startTimer.start();
  }
}

You would also need to change

new createGUI().execute();

to something like

new createGUI(new Thread(new startTimer())).execute();

Also, class names should start with a capital letter. CreateGUI and StartTimer