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copied!<p>This experiment suggests one answer is 'Use a PLAF that is not Metal'.</p> <p><img src="https://i.stack.imgur.com/89avK.png" alt="Look Of Disabled Buttons"></p> <pre><code>import java.awt.*; import javax.swing.*; class LookOfDisabledButton { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { JPanel gui = new JPanel(new BorderLayout(3,3)); JPanel pEnabled = new JPanel(new GridLayout(1,0,2,2)); pEnabled.setBackground(Color.green); gui.add(pEnabled, BorderLayout.NORTH); JPanel pDisabled = new JPanel(new GridLayout(1,0,2,2)); pDisabled.setBackground(Color.red); gui.add(pDisabled, BorderLayout.SOUTH); UIManager.LookAndFeelInfo[] plafs = UIManager.getInstalledLookAndFeels(); for (UIManager.LookAndFeelInfo plafInfo : plafs) { try { UIManager.setLookAndFeel(plafInfo.getClassName()); JButton bEnabled = new JButton(plafInfo.getName()); pEnabled.add(bEnabled); JButton bDisabled = new JButton(plafInfo.getName()); bDisabled.setEnabled(false); pDisabled.add(bDisabled); } catch(Exception e) { e.printStackTrace(); } } JOptionPane.showMessageDialog(null, gui); } }); } } </code></pre> <hr> <p>Alternately, adjust the values in the <code>UIManager</code>.</p> <p><img src="https://i.stack.imgur.com/zHjBJ.png" alt="UIManager tweak"></p> <pre><code>import java.awt.*; import javax.swing.*; class LookOfDisabledButton { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { JPanel gui = new JPanel(new BorderLayout(3,3)); JPanel pEnabled = new JPanel(new GridLayout(1,0,2,2)); pEnabled.setBackground(Color.green); gui.add(pEnabled, BorderLayout.NORTH); JPanel pDisabled = new JPanel(new GridLayout(1,0,2,2)); pDisabled.setBackground(Color.red); gui.add(pDisabled, BorderLayout.SOUTH); // tweak the Color of the Metal disabled button UIManager.put("Button.disabledText", new Color(40,40,255)); UIManager.LookAndFeelInfo[] plafs = UIManager.getInstalledLookAndFeels(); for (UIManager.LookAndFeelInfo plafInfo : plafs) { try { UIManager.setLookAndFeel(plafInfo.getClassName()); JButton bEnabled = new JButton(plafInfo.getName()); pEnabled.add(bEnabled); JButton bDisabled = new JButton(plafInfo.getName()); bDisabled.setEnabled(false); pDisabled.add(bDisabled); } catch(Exception e) { e.printStackTrace(); } } JOptionPane.showMessageDialog(null, gui); } }); } } </code></pre> <hr> <p>As pointed out by kleopatra..</p> <blockquote> <p>it's not a solution but might be a pointer to the direction to search for a solution </p> </blockquote> <p>Where 'it' is my answer. In fact, I suspect she hit upon the real cause with the comment:</p> <blockquote> <p>guessing only: here it's due to violating the one-plaf-only rule.</p> </blockquote> <p>I second that guess.</p>

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