repaint() in Java doesn't “re-paint” immediately?

Question

I have a code like that:

// In MyPanel.java
public void paintComponent(Graphics g)
{
    super.paintComponent(g);
    // Draw something
    mypanel_count++;
         


        

Answer 1

As the other answers say: it's a problem of when AWT is calling paint().

If you do some work that needs information from painted/layouted Components, what helps is also to put this work into a worker thread that waits until the painting is done.

In your case that would be something like:

panel.repaint();

SwingUtilities.invokeLater(new Runnable() {
    public void run() {
        // do huge work
        test_count++;
        System.out.println("Test_count: " + test_count 
             + ", MyPanel_count: " + mypanel_count);
    }
});

Although I'm not sure how it would behave in your while loop.