making pop up window by using SwingUtilities.invokeLater

Question

I am writing a turn-based game on the internet. I try to pop up a window that should be in front until the input stream is ready. I created smth like this, but it seems that it does not work.

class CustomBlockerDialog extends JDialog {
/**
 * 
 */
private static final long serialVersionUID = 1L;

public CustomBlockerDialog(Frame owner, String text) {
    super(owner, true);
    setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
    setSize(300, 100); // Adjust if needed
    setTitle("");
    add(new JLabel(text, SwingConstants.CENTER));
} 
}




final CustomBlockerDialog block = new CustomBlockerDialog(null, "Not your turn");

SwingUtilities.invokeLater(new Runnable() {//A

    @Override
    public void run() {
        System.out.println("show");
        block.setVisible(true);
    }
});


boolean one_write_only = true;
while(in.ready()){ /* C*/ 
    if(one_write_only){
        System.out.println("waiting server");
        one_write_only = false;
    }
};

System.out.println("suppose to hide");

SwingUtilities.invokeLater(new Runnable() {//B

    @Override
    public void run() {
    System.out.println("hide");
    block.setVisible(false);
    }
});

It looks like "A" and "B" are executed after "C" and I have no idea why.

Answer 1

Thanks to Hovercraft Full Of Eels, I created a little different solution which works in my case:

final SwingWorker<Object,Object> worker2 = new SwingWorker<Object, Object>() {
        public Object doInBackground() throws Exception {
          boolean one_write_only = true;
            while(!in.ready()){ /* C*/ 
              if(one_write_only){
                System.out.println("waiting server");
                one_write_only = false;
              }
            }
            return one_write_only;
        }

        protected void done() {
            try {
                block.setVisible(false);
            } catch (Exception ignore) {}
        }

};
worker2.execute();
block.setVisible(true);