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    <p>I would write a custom <code>PianoLayoutManager</code> and position the black keys with a higher z-order than the white buttons. Create your own "constraint" class that allows you to add components like this:</p> <pre><code>add(new WhiteKey(), new PianoLayoutConstraint(WHITE, 1); add(new WhiteKey(), new PianoLayoutConstraint(WHITE, 2); ... add(new WhiteKey(), new PianoLayoutConstraint(WHITE, n); add(new BlackKey(), new PianoLayoutConstraint(BLACK, 1); add(new BlackKey(), new PianoLayoutConstraint(BLACK, 2); ... add(new BlackKey(), new PianoLayoutConstraint(BLACK, m); </code></pre> <p>From <a href="http://download.oracle.com/javase/tutorial/uiswing/components/jcomponent.html" rel="nofollow noreferrer">Using Swing Components tutorial trail</a></p> <blockquote> <p><strong>Note:</strong> The z-order determines the order that components are painted. The component with the highest z-order paints first and the component with the lowest z-order paints last. Where components overlap, the component with the lower z-order paints over the component with the higher z-order.</p> </blockquote> <p>Here is an ugly hack that uses null-layout to get you started.</p> <pre><code>import java.awt.Color; import javax.swing.*; class PianoComponent extends JPanel { PianoComponent() { setLayout(null); for (int i = 0; i &lt; 20; i++) { JButton key = new JButton(); key.setBackground(Color.WHITE); key.setLocation(i * 20, 0); key.setSize(20, 120); add(key); setComponentZOrder(key, i); } for (int i = 0; i &lt; 20; i++) { int j = i % 7; if (j == 2 || j == 6) continue; JButton key = new JButton(); key.setBackground(Color.BLACK); key.setLocation(i * 20 + 12, 0); key.setSize(16, 80); add(key); setComponentZOrder(key, 0); } } } public class Test { public static void main(String[] args) { JFrame jf = new JFrame("Piano!"); jf.setSize(400, 200); jf.add(new PianoComponent()); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jf.setVisible(true); } } </code></pre> <p><img src="https://i.stack.imgur.com/bo6Fp.png" alt="enter image description here"></p>
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    1. COComponents z order are messed up!!
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    2. COyou think? I think it looks good... :)
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    3. COEhhh, compiled and run and moved mouse over it... it will render the buttons in the wrong order when they are re-rendered.
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