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Java - redraw not working

So, I am creating an applet based on PHP in Java. I use SWING panels, with text fields and buttons. I program it in Netbeans and I use the GUI editor. I created an HTML page and it opens in the browser in order. When I press the button to switch panels (basically, the first one is not visible), the new panel does not load. I tried using repaint () and validate (), but it just doesn't work ..... Any help?

package applettest; import javax.swing.UIManager; public class NewApplet extends java.applet.Applet { startScreen ss; registerScreen rs; charactercreationScreen ccs; @Override public void init() { try { //This sets the look and feel to NIMBUS. UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); } catch (Exception ex) { ex.printStackTrace(); } try { java.awt.EventQueue.invokeAndWait(new Runnable() { @Override public void run() { initComponents(); startup(); } }); } catch (Exception ex) { ex.printStackTrace(); } } // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 400, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 300, Short.MAX_VALUE) ); }// </editor-fold> // Variables declaration - do not modify // End of variables declaration public void startup() { showCharacterCreationScreenSTART(); showRegisterScreenSTART(); showStartScreenSTART(); } public void showStartScreen() { setSize(410, 350); ss = new applettest.startScreen(this); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); } public void showStartScreenSTART() { setSize(410, 350); rs.setVisible(false); ss = new applettest.startScreen(this); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); repaint(); validate(); } public void showRegisterScreen() { repaint(); validate(); ss.setVisible(false); setSize(400, 350); rs = new applettest.registerScreen(this); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); repaint(); validate(); } public void showRegisterScreenSTART() { repaint(); validate(); ccs.setVisible(false); setSize(400, 350); rs = new applettest.registerScreen(this); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); repaint(); validate(); } public void showCharacterCreationScreen() { rs.setVisible(false); setSize(400, 350); ccs = new applettest.charactercreationScreen(this); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); repaint(); validate(); } public void showCharacterCreationScreenSTART() { setSize(400, 350); ccs = new applettest.charactercreationScreen(this); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING). addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)); } }
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I tried using repaint () and validate (), but it just doesn't work.

FYI, when using Swing it should be:

 panel.revalidate(); panel.repaint(); // sometimes needed

although this code is usually used when adding / removing individual components from the panel. If you change all panels, then CardLayout is the way to go.

In addition, you should extend JApplet, not Applet.

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