CODEWITHSUNDEEP
javaswingjpaneljtabbedpane
user2802785
user2802785

Reputation: 109

JTabbedPane not working with JPanels

For Java GUI homework extra credit, I am trying to add a couple of Panels to a JTabbedPane. Actually, they were JFrames, but I just changed to extend JPanel instead of JFrame and removed the main(). Anyway, the when I run the main(),the JTabbedPane, and both panels show up, but separate. What am I missing? 

   import javax.swing.*;

public class TabbedPane extends JFrame
{

    JPanel DayGui = new JPanel();
    JPanel OfficeAreaCalculator = new JPanel();
    JLabel firstLabel = new JLabel("First tabbed pane");
    JLabel secondLabel = new JLabel("Second tabbed pane");
    JTabbedPane tabbedPane = new JTabbedPane();

    // constructor
    public TabbedPane()
    {
        DayGui.add(firstLabel);
        OfficeAreaCalculator.add(secondLabel);

        tabbedPane.add("First Panel", DayGui);
        tabbedPane.add("Second Panel", OfficeAreaCalculator);
        add(tabbedPane);

    }

    public static void main(String[] args)
    {
        TabbedPane tab = new TabbedPane();
        tab.pack();
        tab.setVisible(true);
        JTabbedPane DayGui = new JTabbedPane();
        JTabbedPane OfficeAreaCalculator = new JTabbedPane();
        DayGui dg = new DayGui();
        OfficeAreaCalculator oac = new OfficeAreaCalculator();
    }
}

Upvotes: 0

Views: 2293

Answers (1)

Reimeus
Reimeus

Reputation: 159864

You're creating 2 pairs of variables for referencing components to add to the JFrame but adding the ones that point to blank JPanels. Study this code based on the official tutorial

public class TabbedPaneApp {

    private static void createAndShowGUI() {

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTabbedPane firstPanel = new JTabbedPane();
        JTabbedPane secondPanel = new JTabbedPane();

        JLabel firstLabel = new JLabel("First tabbed pane");
        JLabel secondLabel = new JLabel("Second tabbed pane");

        JTabbedPane tabbedPane = new JTabbedPane() {
            public Dimension getPreferredSize() {
                return new Dimension(500, 400);
            };
        };

        firstPanel.add(firstLabel);
        secondPanel.add(secondLabel);

        tabbedPane.add("First Panel", firstPanel);
        tabbedPane.add("Second Panel", secondPanel);
        frame.add(tabbedPane);

        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

Upvotes: 2

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