repaint in a loop

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You can use JComponent.paintImmediately to force an immediate repaint.

EDIT: After reading your question again it occurs to me that you might be executing your logic on the event dispatch thread. This would mean that the repaint requests will not be executed until after your method returns. If you put your code into another thread then that will probably fix the problem and it will be a lot nicer than using paintImmediately.

void uiFunction() {
    new Thread() {
        public void run() {
            for(int i = 0; i < 10; i++) {
                final JButton b = buttons[i];
                SwingUtilities.invokeLater(new Runnable() {
                    b.setBackground(Color.WHITE);
                    b.repaint();
                }
                Thread.sleep(2000);
                SwingUtilities.invokeLater(new Runnable() {
                    b.setBackground(Color.GRAY);
                    b.repaint();
                }
            }
        }
    }.run();
}

It’s a bit mucky but hopefully it gives you an idea of where to begin.

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