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POHow to remove all components from a JFrame with removeAll()?
 

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  1. POHow to remove all components from a JFrame with removeAll()?
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    <p>So I want to have everything removed from my <code>JFrame</code> when a string equals a certain value, but when I call <code>removeAll();</code> followed by <code>revalidate();</code> and <code>repaint();</code>, it doesn't change anything.</p> <p>I have tried calling <code>getContentPane.removeAll();</code> as directed <a href="https://stackoverflow.com/questions/9347076/how-to-remove-all-components-from-a-jframe-in-java">here</a>, but that did not do anything.</p> <p>My code is as follows: </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"; 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"}; if ("Main".equals(selectionMenu)) { 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(); repaint(); } if ("VehiclesValue".equals(selectionMenu)) { removeAll(); revalidate(); repaint(); } } @Override public void actionPerformed(ActionEvent e) { if ("Main".equals(selectionMenu)) { 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)) { selectionMenu = "VehiclesValue"; System.out.println("Menu selected: " + selectionMenu); revalidate(); repaint(); } } } } public void createAndShowGUI() { JFrame f = new MTGSAMPServerReference(); f.pack(); f.setVisible(true); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //f.add(new drawOnPanel()); f.setSize(1200, 800); f.setLocationRelativeTo(null); list1.setSize(250, 250); list1.setLocation(0, 0); select1.setSize(75, 25); select1.setLocation(251, 276); MTGSAMPServerReference.this.repaint(); } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { MTGSAMPServerReference gui = new MTGSAMPServerReference(); gui.createAndShowGUI(); } }); } } </code></pre> <p>I have done my research, but can't figure out what it is that I am doing wrong.</p> <p>And if I try changing my <code>JFrame f to a Global Variable instead of a Local Variable</code>, it doesn't display anything to begin with.</p> <p>And yes, I know I am <code>mixing Commmand Line with GUI</code>, but that is <code>only for debugging purposes</code>. When I am finished, I will simply remove everything <code>Command Line related</code>.</p> <p>Anyways, any ideas on my problem?</p> <p>And thanks in advance!</p>
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    1. USCommunity
    1. USknorberg
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    1. CO`static` variables is a pretty good indication of a bad design
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      1. POHow to remove all components from a JFrame with removeAll()?
      1. USMadProgrammer
    2. COFor this, I'd use a [`CardLayout`](http://docs.oracle.com/javase/7/docs/api/java/awt/CardLayout.html) as seen in this [short example](http://stackoverflow.com/a/5786005/418556).
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      1. POHow to remove all components from a JFrame with removeAll()?
      1. USAndrew Thompson
    3. COI think your design is pretty mucked up. You seem to be assuming if you construct two different instance of a class, you can some how magically effect the other. This isn't going to work, hence my first comment...
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      1. POHow to remove all components from a JFrame with removeAll()?
      1. USMadProgrammer
 

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