Question

I am trying to create a loading screen for my program so it will display the loading screen while loading the main screen or while executing a particular task. I tried to use a JDialog as the loading screen but for some reason, once the loading screen dialog opens up, it doesnt let the main program run its own job. How do I make them work both at the same time?

Here is the code for my loading screen:

public class FrmLoading extends JDialog {

  private static FrmLoading loading;

  public FrmLoading(java.awt.Frame parent, boolean modal) {
    super(parent, modal);
    initComponents();
    this.setLocationRelativeTo(null);
  }

  public static void startAnimation(){
    loading = new frmLoading(null, true);
    loading.setVisible(true);
  }

  public static void stopAnimation(){
    loading.dispose();
  }

  private void initComponents(){
    //build the Dialog
  }
}

this is how I use it:

private void login(){
    FrmLoading.startAnimation();
    //open main program
}

...

private void mainStart(){
    //load contents
    FrmLoading.stopAnimation();
}

I know that there is a loadingscreen default to java swing but I dont want to use it, I want the animation I made.

Answer 1

Use SwingWorker

SwingWorker<Void, Void> worker = new SwingWorker<Void, Void>() {
    @Override
    protected Void doInBackground() {
        //do your stuff in background
        return null;
    }

    @Override
    protected void done() {
        frmMain.setVisible(true);
        loading.dispose();
        disposeThis(); //a method that calls this.dispose();
    }
};
worker.execute();
loading.setVisible(true);