Question

Little background:
I have a JTextField called reading. It is located on a JFrame panel.

reading = new JTextField("waiting for entry");

What I am trying to do is amend the JTextField to where it creates a blinking effect. Appears, and then disappears. I want that to alert the user that it needs attention.

So is there a way where I at a blink of an eye, its sometimes a blank string, sometimes showing ‘waiting for entry’:

reading.setText("           ");

reading.setText("Waiting for entry");

Any suggestions?

In the same class I have :

    public void test(){
    int delay = 300; //milliseconds
    ActionListener taskPerformer = new ActionListener() {
   public void actionPerformed(ActionEvent evt) {
        reading.setVisible(!reading.isVisible()); } };
    Timer ok = new Timer(delay, taskPerformer);
    ok.start();

and let me show you my actionListener when reading gets the value:

public class MyChangeAction implements ChangeListener{
    public  void stateChanged(ChangeEvent ce){
      int value_MAP = slider.getValue();
      String str = Integer.toString(value_MAP);
      reading.setVisible(true); // I just added this 
      reading.setText("     MAP "+ str+" mm Hg ");
}}

So where do I type ok.stop(); or ok.cancel();

Answer 1

You could use a Timer and have

private class BlinkTask extends TimerTask
{
    public void run()
    {
        reading.setVisible(!reading.isVisible());
    }
}

registered to run every second or so.
Some Examples: link