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POJLabels (And other things) wont show up inside a JPanel in a JFrame (multiple JFrames)
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copied!<p>I've created an app but I have a problem with my JLabels not showing up properly. The app currently looks like this:</p> <p><img src="https://i.stack.imgur.com/HFnuC.png" alt="app screenshot"></p> <p>These are 2 JPanels inside a JFrame created with the following code:</p> <pre><code>public JFrame window = new JFrame(); public JPanel top = new JPanel(); public static JPanel main = new JPanel(); public JPanel login = new JPanel(); // ... </code></pre> <p>Inside the main class:</p> <pre><code>window.setSize(1000, 700); login.setSize(250, 200); // main.setSize(500,500); main.setLocation(500,100); window.add(login); window.add(main); login.add(new view.LoginPanel()); main.setLayout(new BorderLayout()); main.add(new view.CategoryList(), BorderLayout.CENTER); main.validate(); main.repaint(); window.validate(); window.setVisible(true); </code></pre> <p>That will show up the frames as I have them now. But above the black line there should be a title that would be created by this:</p> <pre><code>public class CategoryList extends JPanel implements MouseListener { public CategoryList() { super(); setLayout(null); initComponents(); revalidate(); repaint(); addTitle(); } } </code></pre> <p>The title is created like this:</p> <pre><code>private void addTitle() { JLabel lblTitle = new JLabel(); lblTitle.setText("Winkelapplicatie"); lblTitle.setBounds(20, 20, 150, 20); lblTitle.setFont(WinkelApplication.FONT_16_BOLD); this.add(lblTitle); System.out.println("addTitle"); } </code></pre> <p>But it does not show up. I know there are a lot of methods not shown in this code, but I have included what I think is all the necessary code.</p> <p>I hope someone can help me, thanks in advance!</p> <p>Edit:</p> <p>I've stripped my code so it can be online: main package: WinkelApplication.java:</p> <pre><code>package main; import java.awt.BorderLayout; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.UIManager; public final class WinkelApplication { public static final String NAME = "hi"; public static final String CURRENCY = "\u20AC"; public JFrame window = new JFrame(); public JPanel top = new JPanel(); public static JPanel main = new JPanel(); public JPanel login = new JPanel(); public static final Font FONT_10_PLAIN = new Font("Verdana", Font.PLAIN, 10); public static final Font FONT_10_BOLD = new Font("Verdana", Font.BOLD, 10); public static final Font FONT_12_BOLD = new Font("Verdana", Font.BOLD, 12); public static final Font FONT_16_BOLD = new Font("Verdana", Font.BOLD, 16); private static WinkelApplication instance = new WinkelApplication(); private WinkelApplication() { } public void initialize() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { System.err.println("Error setting LookAndFeelClassName: " + e); } } public void startup() { window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setSize(1000, 700); login.setSize(250, 200); main.setLocation(500,100); window.add(login); window.add(main); login.add(new main.LoginPanel()); main.setLayout(new BorderLayout()); main.add(new main.CategoryList(), BorderLayout.CENTER); main.validate(); main.repaint(); window.validate(); window.setVisible(true); } public static WinkelApplication getInstance() { return instance; } public static void main(String args[]) { final WinkelApplication applicatie = WinkelApplication.getInstance(); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { applicatie.initialize(); applicatie.startup(); } catch (Exception e) { System.out.println("Application" + applicatie.getClass().getName() + "failed to launch"); } } }); } } </code></pre> <p>LoginPanel class: (Just a textfield created with the GUI Designer in Netbeans)</p> <pre><code> /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package main; import main.WinkelApplication; public class LoginPanel extends javax.swing.JPanel { /** * Creates new form LoginPanel */ public LoginPanel() { initComponents(); } private Boolean loggedIn = null; @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { javax.swing.JLabel jLabel1 = new javax.swing.JLabel(); jLabel1.setText("TextField in JPanel 1"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(114, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel1) .addContainerGap(98, Short.MAX_VALUE)) ); }// </editor-fold> public Boolean isLoggedIn(){ return loggedIn; } // Variables declaration - do not modify // End of variables declaration } </code></pre> <p>CategoryList class (Here the text should be above the line, but that does not show up)</p> <pre><code>package main; import main.WinkelApplication; import java.awt.Graphics; import javax.swing.JLabel; import javax.swing.JPanel; public class CategoryList extends JPanel { public CategoryList() { super(); setLayout(null); initComponents(); } /** create the gui for this page */ private void initComponents() { addTitle(); } /** add the page's title */ private void addTitle() { JLabel lblTitle = new JLabel(); lblTitle.setText("Winkelapplicatie"); lblTitle.setBounds(20, 20, 150, 20); lblTitle.setFont(WinkelApplication.FONT_16_BOLD); this.add(lblTitle); System.out.println("addTitle"); } @Override public void paint(Graphics graphics) { super.paint(graphics); graphics.drawLine(20, 45, 540, 45); } } </code></pre> <p>Hope somebody can help me now. Thanks in advance again.</p>

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