Using Java JComponent repaint ()

Question

I am writing a simple Game of Life program in Java and I have problems reviving it. I have a JComponent class called LifeDraw that displays a grid of pixels with the following drawing method:

protected void paintComponent(Graphics g) {
    super.paintComponent(g);

    for (int y = 0; y < lGrid.getHeight(); y++) {
        for (int x = 0; x < lGrid.getWidth(); x++) {
            if (lGrid.getCell(x,y) == 1) {
                g.setColor(Color.red);
                g.fillRect(x * lGrid.getSqSize(), y * lGrid.getSqSize(), lGrid.getSqSize(), lGrid.getSqSize());
            } else {
                g.setColor(Color.white);
                g.fillRect(x * lGrid.getSqSize(), y * lGrid.getSqSize(), lGrid.getSqSize(), lGrid.getSqSize());
            }
        }
    }
}

And then another LifeGrid class , which has a method run()that, when called, updates the pixel grid for one generation, and then calls LifeDraw.repaint(). However, if I try to call run()in a loop, the JComponent will not be redrawn until the loop is complete, so all that is ever displayed is the first generation and the last. I figured this was probably updating too fast to redraw, so I tried using Thread.sleep()between iterations, but still had the same problem. Theoretically (or at least I was hoping this is so), it should repaint the component between each iteration and display the pixel animation.

Java, . , , .

Answer 1

, , run() Timer while while.

Answer 2

, . repaint() :

SwingUtilities.invokeLater(new Runnable()
{
    public void run()
    {
        repaint();
    }
}); 

Answer 3

JavaDocs repaint():

, . .

Any repainting is a signal that the area needs repainting.
Try paintImmediatelyor update.