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    <p>I see several problems with that code:</p> <ul> <li><p>MTGSAMPServerReference is called two times, one in the main, and another by <code>createAndShowGUI()</code>.</p></li> <li><p>MTGSAMPServerReference extends JFrame, but createAndShowGUI() contains a local variable <code>JFrame f</code> too. Esentially you are assigning <code>this</code> to a local variable <code>f</code>, which serves no purpose.</p></li> <li><p>To initialize the GUI you execute the constructor and <code>createAndShowGUI()</code>, after that all the code that can be executed is due to events. In your case in the <code>actionPerformed()</code> method. If you want to remove the components inside the frame, you have to do the proper code there (or at some point called from there).</p></li> <li><p>As stated by your link, to remove all components you have to execute <code>removeAll()</code> on the contentPane of the JFrame, obtained with <code>getContentPane()</code>.</p></li> <li><p>I don't know what you intend to do with those comparations <code>if("Main".equals(selectionMenu))</code>. Again that is initialization code, it's ran once. There you build all the GUI. The variable <code>selectionMenu</code> may change in the future, but that doesn't retroactively execute that code. If you want to do anything using the new value of <code>selectionMenu</code>, do it on the actionListener.</p></li> </ul> <p>Here's a working modification of your code.</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; public class MTGSAMPServerReference extends JFrame implements ActionListener { private static final long serialVersionUID = 1L; private static JList list1; private static JButton select1; public static String selectionMenu = "Main"; //accomplishes nothing public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { MTGSAMPServerReference gui = new MTGSAMPServerReference(); gui.createAndShowGUI(); } }); } public void createAndShowGUI() { pack(); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //f.add(new drawOnPanel()); setSize(1200, 800); setLocationRelativeTo(null); list1.setSize(250, 250); list1.setLocation(0, 0); select1.setSize(75, 25); select1.setLocation(251, 276); setVisible(true); } public MTGSAMPServerReference() { this.getContentPane().setLayout(new FlowLayout(FlowLayout.LEADING)); Object[]mainMenu = {"Vehicles", "Bikes/Bicycles", "Boats", "Houses", "Businesses", "Objects", "Jobs", "Ranks", "Licenses", "VIP", "FAQ's"}; Object[]VehiclesValueMenu = {"Lower Class", "Upper Class", "VIP"}; JPanel controls = new JPanel(new BorderLayout(5,5)); list1 = new JList&lt;Object&gt;(mainMenu); list1.setVisibleRowCount(10); select1 = new JButton("Select"); select1.addActionListener(this); controls.add(new JScrollPane(list1)); controls.add(select1, BorderLayout.PAGE_END); controls.setBorder(new EmptyBorder(25,25,0,0)); add(controls); //revalidate(); //uneeded at this point the JFrame is not yet visible, thus nothing to repaint //repaint(); } @Override public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("Select")) { int indexMain = list1.getSelectedIndex(); System.out.println("Index Selected: " + indexMain); String valueMain = (String) list1.getSelectedValue(); System.out.println("Value Selected: " + valueMain); if ("Vehicles".equals(valueMain)) { System.out.println("Menu selected: " + selectionMenu); getContentPane().removeAll(); //equivalent to this.getContentPane().removeAll(); revalidate(); repaint(); } } } } </code></pre> <p>Also I've erased the modifications of the variable <code>selectionMenu</code> it doesn't really do anything now.</p> <p>As stated by others, you probably want to use another Layout at some point. Which one depends on what else you want on the JFrame.</p> <p>Cheers.</p>
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    1. POHow to remove all components from a JFrame with removeAll()?
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    1. COActually, the modifications do change things. But anyways, I will try this!
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    2. COThis works thanks!
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