GUI threading in java

Question

I\'m trying to code a simple game in Java. The basic structure is a single JFrame with different JPanels that I add/remove at different times. At s

Answer 1

never really never use Thread.sleep(1000); during EDT, this code caused freeze on GUI is un_resposible, untill a new event invoke EDT or mouse hover over can alive this container too

1) there are two ways how to dealy any event(s) in the Swing GUI, by implements

• Swing Timer

• delaying by using Thread.sleep(1000); in the SwingWorker

Answer 2

You can start some code with a time delay using TimerTask:

Timer timer = new Timer();
timer.schedule(new TimerTask() {
    public void run() {
        invokeLater(); // This starts after [delay] ms 
        // and - if given - will run every [period] ms.
    }
}, delay, period);

You could solve your problem with this, though it won't be a pretty solution.

// edit: (see comments) you should synchronize accesses to the gui properly, else it will give you errors.

Answer 3

The layout and painting must be done in EDT. Use SwingUtilities.invokeAndWait to call the validate() and repaint()