Java – Replacing JPanel with JPanel in a JFrame

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I have a class that extends JFrame, and it has a BorderLayout. It has two private instance variables of type JPanel. They represent panels of buttons and are called flipButton and confidenceButtons. When you click on the button, the panel of buttons is replaced by the other panel of buttons. That is, if you click on a button in flipButton, flipButton is replaced by confidenceButtons. I tried to do it like this:

  private class FlipListener implements ActionListener{
    public void actionPerformed(ActionEvent e){
      remove(flipButton); 
      add(confidenceButtons,BorderLayout.SOUTH);
      validate();
      ...
    }
  } 
  private class ColorListener implements ActionListener{
    ...
    public void actionPerformed(ActionEvent e){
      ...
      remove(confidenceButtons); 
      add(flipButton,BorderLayout.SOUTH);
      validate();
    }
  }

The buttons in flipButton have FlipListeners and the ones in confidenceButtons have ColorListeners. When the program is run, clicking on a button will remove the panel, but nothing is added to replace it. What am I doing wrong?

EDIT

CardLayout turned out to be a simple and easy solution. It turns out that the above code does work; the problem was a typo in another section of my code. >.< However, I've always had trouble using these methods, and CardLayout, I find, simplifies it for me. Thanks.

Best Answer

Use a CardLayout, as shown here.

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Related Solutions

Java – how to replace jpanel with anotherjpanel on jframe when button is clicked

I created an example for you, take a look at the actionPerformed(ActionEvent e) method

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class PanelSwap extends JPanel implements ActionListener {

    JPanel firstPanel = new JPanel();
    JPanel secondPanel = new JPanel();

    public PanelSwap() {
        super(new BorderLayout());
        firstPanel.setBackground(Color.RED);

        secondPanel.setBackground(Color.YELLOW);

        JButton swap1 = new JButton("SwapToYellow");
        swap1.addActionListener(this);

        JButton swap2 = new JButton("SwapToRed");
        swap2.addActionListener(this);

        firstPanel.add(swap1);
        secondPanel.add(swap2);

        add(firstPanel);
    }

    /** Listens to the buttons and perfomr the swap. */
    public void actionPerformed(ActionEvent e) {

        for (Component component : getComponents())
            if (firstPanel == component) {
                remove(firstPanel);
                add(secondPanel);

            } else {
                remove(secondPanel);
                add(firstPanel);
            }

        repaint();
        revalidate();
    }

    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event-dispatching thread.
     */
    private static void createAndShowGUI() {
        // Create and set up the window.
        JFrame frame = new JFrame("PanelSwap");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create and set up the content pane.
        JComponent newContentPane = new PanelSwap();
        newContentPane.setOpaque(true); // content panes must be opaque
        frame.setContentPane(newContentPane);

        // Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        // Schedule a job for the event-dispatching thread:
        // creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

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