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    <p>The likely cause of the problem is probably down to the fact that you've failed to call <code>super.paint</code>, but since you've not provided the paint code, it's only an educated guess...</p> <p>Some other educated guesses...</p> <ul> <li>You're overriding <code>paint</code> (possibly of a top level container like <code>JFrame</code>), when you should be overriding <code>paintComponent</code> of something like <code>JComponent</code> or <code>JPanel</code> (and calling <code>super.paintComponent</code>)</li> </ul> <p>Take a look at <a href="http://docs.oracle.com/javase/tutorial/uiswing/painting/" rel="nofollow">Performing Custom Painting</a> and <a href="http://www.oracle.com/technetwork/java/painting-140037.html" rel="nofollow">Painting in AWT and Swing</a> for more details</p> <p><strong>Updated based on updated code</strong></p> <p>You have two basic problems...</p> <pre><code>public class Board2 extends JFrame { //... public void paint(Graphics g) { g.setColor(Color.BLUE); g.fillRect(50,50,20,20); } </code></pre> <p>You're overriding <code>paint</code> of top level container and you're breaking the paint chain.</p> <p>Painting in Swing is done by a series of chained method calls which work together to produce the final result, reach doing a particular job, when you fail to call <code>super.paint</code>, you stop these methods from working.</p> <p>When you do this on a top level container you can prevent it from painting it's children as well...</p> <p>Also, top level containers aren't double buffered, which makes them flicker when painted.</p> <p>Instead, create yourself a custom component, override it's <code>paintComponent</code> and do your custom painting there</p> <p>For example...</p> <pre><code>public class Board2 extends JFrame { static JPanel p1 static JButton b1 public Board2(){ setSize(1000, 800); setResizable(false); b1 = new JButton("Button"); p1 = new JPanel() { protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.BLUE); g.fillRect(50,50,20,20); } } p1.add(b1); add(p1, BorderLayout.CENTER); setVisible(true); } public static void main(String args[]){ EventQueue.invokeLater(new Runnable() { public void run() { new Board2(); } }); } } </code></pre>
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    1. COThat would be my best guess too; hopefully, OP will show us his/her source code soon.
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    2. COWhat if I want to call the paintComponent method from another method or class?
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    3. COYou should never call paintComponent directly, instead, call repaint
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