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POJava swing questions in ActionListener
 

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    <pre><code>//GUI.java public class GUI extends JFrame implements ActionListener { private static final long serialVersionUID = 870343916997182570L; private JPanel btmPanel; public GUI(String arg0) throws HeadlessException { super(arg0); createGUI(); } private void createGUI() { setSize(WIDTH, HEIGHT); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLayout(new BorderLayout()); //ResultPanel rslt = new ResultPanel(); //this.getContentPane().add(rslt.createPanel(), BorderLayout.CENTER); btmPanel = new JPanel(); btmPanel.setBackground(Color.LIGHT_GRAY); btmPanel.setLayout(new FlowLayout()); JButton blueSearch = new JButton("Search"); blueSearch.setBackground(Color.WHITE); blueSearch.addActionListener(this); btmPanel.add(blueSearch); JButton blackChart = new JButton("Chart"); blackChart.setBackground(Color.WHITE); blackChart.addActionListener(this); btmPanel.add(blackChart); this.getContentPane().add(btmPanel, BorderLayout.SOUTH); } @Override public void actionPerformed(ActionEvent e) { String buttonString = e.getActionCommand(); if (buttonString.equals("Search")) { ResultPanel rslt = new ResultPanel(); this.getContentPane().add(rslt.createPanel(), BorderLayout.CENTER); } } } //ResultPanel.java public class ResultPanel extends JPanel implements ActionListener { private static final long serialVersionUID = -7851502165390304971L; private JPanel textPanel; private JTextArea textDisplay; public ResultPanel() { textPanel = new JPanel(); textDisplay = new JTextArea("Text Area:"); } public JPanel createPanel() { textDisplay.setEditable(true); textPanel.setBackground(Color.LIGHT_GRAY); textPanel.setLayout(new BorderLayout()); textPanel.add(textDisplay,BorderLayout.CENTER); return textPanel; } @Override public void actionPerformed(ActionEvent e) { } } </code></pre> <p>I have two buttons on the main frame, and I hope to change the panel when I press the button.</p> <p>The question is that the code in "actionPerformed" doesn't work,</p> <p>but it works well if I put them in the creatGUI()....(see the marked section).</p> <p>Is that anything wrong ?</p>
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    1. USuser1371541
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    1. COHave you checked that the actionPerformed method is being called at all? Printing something to the console from it is the easiest
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    2. COUse a `CardLayout` as shown [here](http://stackoverflow.com/questions/5665156/calling-awt-frame-methods-from-subclass/5786005#5786005) (and a `ButtonGroup` with `JRadioButton` instances).
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      1. USAndrew Thompson
 

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