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    <p>You need to add ActionListeners to buttons for them to work.</p> <p>This is usually done via a simple method call: <code>red.addActionListener(someListener);</code></p> <p>Also:</p> <ul> <li>get rid of your <code>setPreferredsize(...)</code> method calls, and instead let components set their own size. At the most you can override <code>getPreferredSize()</code> if need be, but try to limit that.</li> <li>Avoid having your GUI code implement your listener interfaces as that leads to confusing and difficult to manage code. Better to use anonymous inner listeners or private inner classes or stand alone listener classes.</li> </ul> <hr> <p>For example:</p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; public class JavaGame2 extends JPanel { private static final int PREF_W = 600; private static final int PREF_H = 400; private static final Font LABEL_FONT = new Font("Arial", Font.BOLD, 20); private static final Color[] FOREGROUNDS = { new Color(0x009900), new Color(0x990000), new Color(0x000099), new Color(0x999900), new Color(0x990099), new Color(0x009999) }; private static final String[] LABEL_TEXTS = { "Hello World!", "Goodbye World!", "Hola Todo el Mundo!", "Hasta la Vista Baby!", "Whatever!!" }; private JButton changetextButton; private JButton changeColorButton; private JLabel label; private int labelTextIndex = 0; private int foregroundIndex = 0; public JavaGame2() { label = new JLabel(LABEL_TEXTS[labelTextIndex], SwingConstants.CENTER); label.setFont(LABEL_FONT); label.setForeground(FOREGROUNDS[foregroundIndex]); // example of anonymous inner ActionListener: changetextButton = new JButton("Change Text"); changetextButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent evt) { labelTextIndex++; labelTextIndex %= LABEL_TEXTS.length; label.setText(LABEL_TEXTS[labelTextIndex]); } }); // example of use of an anonymous AbstractAction: changeColorButton = new JButton(new AbstractAction("Change Color") { @Override public void actionPerformed(ActionEvent e) { foregroundIndex++; foregroundIndex %= FOREGROUNDS.length; label.setForeground(FOREGROUNDS[foregroundIndex]); } }); setLayout(new BorderLayout()); add(changetextButton, BorderLayout.NORTH); add(changeColorButton, BorderLayout.SOUTH); add(label, BorderLayout.CENTER); } @Override public Dimension getPreferredSize() { return new Dimension(PREF_W, PREF_H); } private static void createAndShowGui() { JavaGame2 mainPanel = new JavaGame2(); JFrame frame = new JFrame("Java Game 2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } </code></pre>
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    1. POI can use getActionCommand to change the label content, but I can't use it to change the color?
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    1. USHovercraft Full Of Eels
    1. USHovercraft Full Of Eels
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    1. POI can use getActionCommand to change the label content, but I can't use it to change the color?
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    1. COI solved it right after I posted the question, but thank you anyways!
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    2. COI've been trying what you said in the second bullet, but I'm confused: how do you add anonymous inner listeners, or private inner classes? Sorry if I seem a little slow, thanks.
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    3. CO@BitLion: for example
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