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POJava - Calling methods in a nested class, specifically an ActionListener
 

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    <p>Edit: Solved, I wasn't using 'validate()' after adding components. </p> <p>I have a GUI class structured something like this (this is a very basic representation of my code):</p> <p>Edit: here's my full code</p> <pre><code>package source; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; public class Gui extends JFrame { public String[] list1 = {"equation1","equation2","equation3","equation4", "equation5"}; public JOptionPane opt1; private JButton custom; private JTextField[] tf; public HandlerClass2 itemhandler = new HandlerClass2(); private JList list; private static int index = 0; private static int lastlistindex = 0; private JPanel buttonpanel; private JPanel buttonpanel2[] = new JPanel[3]; private JPanel listpanel[] = new JPanel[4]; private JPanel checkpanel; private JCheckBox checkboxes[]; private SpringLayout layout; public Container contentPane; private JButton but; public Gui() { super("Physics Helper v0.1"); setBackground(Color.DARK_GRAY); layout = new SpringLayout(); contentPane = getContentPane(); contentPane.setLayout(layout); displayPortal(); } public void displayPortal() { Icon a = new ImageIcon(getClass().getResource("button.png")); Icon b = new ImageIcon(getClass().getResource("button2.png")); custom = new JButton("", a); custom.setRolloverIcon(b); buttonpanel = new JPanel(); buttonpanel.setBackground(Color.GRAY); buttonpanel.add(custom); contentPane.add(buttonpanel); layout.putConstraint(SpringLayout.WEST, buttonpanel, 5, SpringLayout.WEST, contentPane); layout.putConstraint(SpringLayout.EAST, buttonpanel, -5, SpringLayout.EAST, contentPane); layout.putConstraint(SpringLayout.NORTH, buttonpanel, 5, SpringLayout.NORTH, contentPane); custom.addActionListener(new HandlerClass()); } public void displayButton(String s) { but = new JButton(s); buttonpanel2[index] = new JPanel(); buttonpanel2[index].setBackground(Color.GRAY); buttonpanel2[index].add(but); contentPane.add(buttonpanel2[index]); layout.putConstraint(SpringLayout.SOUTH, buttonpanel2[index], -5, SpringLayout.SOUTH, contentPane); if (index &lt; 1) { layout.putConstraint(SpringLayout.WEST, buttonpanel2[index], 5, SpringLayout.WEST, contentPane); } else { layout.putConstraint(SpringLayout.WEST, buttonpanel2[index], 5, SpringLayout.EAST, buttonpanel2[index - 1]); } index++; } public void displayList(String[] t) { list = new JList(t); list.setVisibleRowCount(8); list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); add(new JScrollPane(list)); listpanel[lastlistindex] = new JPanel(); listpanel[lastlistindex].setBackground(Color.GRAY); listpanel[lastlistindex].add(list); contentPane.add(listpanel[lastlistindex]); layout.putConstraint(SpringLayout.NORTH, listpanel[lastlistindex], 5, SpringLayout.SOUTH, buttonpanel); if (lastlistindex &lt; 1) { layout.putConstraint(SpringLayout.WEST, listpanel[lastlistindex], 5, SpringLayout.WEST, contentPane); } else { layout.putConstraint(SpringLayout.WEST, listpanel[lastlistindex], 5, SpringLayout.EAST, listpanel[lastlistindex - 1]); } lastlistindex++; } public void displayInputValues(String[] p) { checkboxes = new JCheckBox[p.length]; GridLayout gridlayout = new GridLayout(p.length, 2); tf = new JTextField[p.length]; checkpanel = new JPanel(); checkpanel.setBackground(Color.GRAY); checkpanel.setLayout(gridlayout); for (int b = 0; b &lt; p.length; b++) { checkboxes[b] = new JCheckBox(p[b]); checkpanel.add(checkboxes[b]); tf[b] = new JTextField("", 9); checkpanel.add(tf[b]); tf[b].setFont(new Font("Serif", Font.PLAIN, 14)); } contentPane.add(checkpanel); layout.putConstraint(SpringLayout.EAST, checkpanel, -5, SpringLayout.EAST, contentPane); layout.putConstraint(SpringLayout.SOUTH, checkpanel, -5, SpringLayout.SOUTH, contentPane); } private class HandlerClass implements ActionListener { public void actionPerformed(ActionEvent event) { displayButton("Back"); displayButton("Next"); displayList(list1); } } </code></pre> <p>My main method is contained within another class, and works fine.</p> <p>My question is how can I call the "displayButton" method in the actionPerformed method? I've tried a few tips already, such as calling it with "Gui.this.displayButton("Press me!").</p> <p>I have tested every other aspect of my code, and this seems to be the only problem.</p> <p>I get no errors when I run the code.</p> <p>If needs be I can post the full class, but I think this problem lies in trying to call these methods.</p> <p>What's your opinion?</p>
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    1. COYou are missing semicolon at end of displayButton("Press me!"). I guess it is typo.
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    2. CO"I get no errors when I run the code." - but your code doesn't compile...
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    3. COIf you fix the compile errors, it works for me (edit: if you add the handler to the button as per @DNA's recommendation -- 1+ up vote to his answer). I am thinking that your problem lies elsewhere in code not show, specifically here: `//more code to display JPanels containing buttons in contentPane`
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      1. USHovercraft Full Of Eels
 

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