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Asked: 2026-05-24T03:22:29+00:00

so I have a section of code that looks like this… public IPGUI() {

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so I have a section of code that looks like this…

public IPGUI() {
        setTitle("IP Extractor");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 250, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        JPanel panel = new JPanel();
        contentPane.add(panel, BorderLayout.CENTER);
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

        JButton btnConvertDocuments = new JButton("1. Convert Documents");
        btnConvertDocuments.setAlignmentX(Component.CENTER_ALIGNMENT);
        btnConvertDocuments.setMaximumSize(new Dimension(160, 0));
        btnConvertDocuments.setPreferredSize(new Dimension(0, 50));

        panel.add(btnConvertDocuments);
        btnConvertDocuments.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //FileConverter fc = new FileConverter();
                            //Why wont the above method work?
            }
        });

        JSeparator separator_3 = new JSeparator();
        panel.add(separator_3);

When I click on the button, this is the error that is produced:

Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problems: 
    FileConverter cannot be resolved to a type
    FileConverter cannot be resolved to a type

    at IPGUI$2.actionPerformed(IPGUI.java:60)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

So I implemented the listener and the action performed event, but I don’t understand why I can’t make the call to that method in another class? Can someone explain where I am going wrong? Thank you in advance for any input.

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1 Answer

  1. Editorial Team

    It appears you’re using Java Swing. Don’t forget to add “implements ActionListener” on the end of your class signature.

    Try this:

    public class IPGUI extends JFrame implements ActionListener {

...

public IPGUI() {
        setTitle("IP Extractor");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 250, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        JPanel panel = new JPanel();
        contentPane.add(panel, BorderLayout.CENTER);
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

        JButton btnConvertDocuments = new JButton("1. Convert Documents");
        btnConvertDocuments.setAlignmentX(Component.CENTER_ALIGNMENT);
        btnConvertDocuments.setMaximumSize(new Dimension(160, 0));
        btnConvertDocuments.setPreferredSize(new Dimension(0, 50));

        panel.add(btnConvertDocuments);
        //btnConvertDocuments.addActionListener(new ActionListener() {
        //    public void actionPerformed(ActionEvent e) {
        //        //FileConverter fc = new FileConverter();
        //                    //Why wont the above method work?
        //    }
        //});

        btnConvertDocuments.setActionCommand("x");
        btnConvertDocuments.addActionListener(this);

        JSeparator separator_3 = new JSeparator();
        panel.add(separator_3);
}

public void actionPerformed(ActionEvent event) {
    String command = event.getActionCommand();
    if (command.equals("x")) {
        //FileConverter fc = new FileConverter();
    }
}
...

}
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