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    <ol> <li><strong>Never</strong> call Thread.sleep from within a paint type of method. Doing this will make your GUI completely unresponsive.</li> <li>Yes, do call the super painting method from within your painting method (as per muhammad's answer).</li> <li>You should not call <code>Thread.sleep(...)</code> from the event thread either as this too will freeze your application.</li> <li>You should skip doing AWT and move to Swing. </li> <li>When you do so, do your drawing in the <code>paintComponent(Graphics g)</code> method of a JComponent or JPanel object.</li> <li>Call the super's <code>paintComponent(g)</code> within your <code>paintComponent</code> method override.</li> <li>Use a Swing Timer to do any delay or animation.</li> </ol> <hr> <p>e.g.,</p> <pre><code>import java.awt.BasicStroke; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.Stroke; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; public class DrawFoo extends JPanel { private static final int PREF_W = 400; private static final int PREF_H = PREF_W; private static final Stroke BASIC_STROKE = new BasicStroke(3f); private static final Color RECT_COLOR = Color.blue; private static final Color OVAL_COLOR = Color.red; private boolean drawCircle = false; private int rectX = 20; private int rectY = 150; private int rectWidth = 100; public DrawFoo() { int delay = 1000; Timer timer = new Timer(delay, new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { drawCircle = true; repaint(); } }); timer.setRepeats(false); timer.start(); } @Override public Dimension getPreferredSize() { return new Dimension(PREF_W, PREF_H); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setStroke(BASIC_STROKE); g2.setColor(RECT_COLOR); g.fillRect(rectX, rectY, rectWidth, rectWidth); if (drawCircle) { g2.setColor(OVAL_COLOR); g.fillOval(rectY, rectX, rectWidth, rectWidth); } } private static void createAndShowGui() { JFrame frame = new JFrame("DrawFoo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(new DrawFoo()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } </code></pre>
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