Question

I have this code to tell me if a port is open or not(available func). And I call that function in my GUI program like this:

String newavail = "" + available(9002) ;


JTextField tf1 = new JTextField("Is Port 9002(GWT Pet Store) available? \n" + newavail);

But if I close the port outside of the running GUI it doesn’t reflect this change right away. I read that you can use a revalidate() command, but how do you use that?

Answer 1

Assuming that the port is closed outside the Event Dispatch Thread, you should use SwingUtilities to set the text of the JTextField instance to reflect the availability status change.

---

// we're outside the EDT
SwingUtilities.invokeLater(new Runnable(){
    @Override
    public void run(){
        // modify Swing component here
    }
});