Multiple JPanel Java Application Windows

Question

Edited to make the code work

This might get closed a a dupe, anyway.

I'm trying to create an application for an assignment. I could just do the easy thing and use multiple JFrames but I don't want to do that.

I want an application with a login screen, a customer screen and an admin screen. I though I could just use JPanels and swap them as required, I can remove the login panel but can't add the customer panel.

Curently, the application starts as expected with the login JPanel

But when I click on ok, it's supposed to close the JPanel and open the customer Jpanel, instead it just closes the login panel.

package projFlight;

import java.awt.EventQueue;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;

import java.awt.Color;
import java.awt.BorderLayout;
import javax.swing.UIManager;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.imageio.ImageIO; 
import javax.swing.ImageIcon;

public class GUIMain {

GUIMainEvent event = new GUIMainEvent(this);

JFrame frame;
GUILoginScreen login = new GUILoginScreen();
GUICustomerScreen custScreen = new GUICustomerScreen();


/**
 * Launch the application.
 */
public static void main(String[] args) {
    GUIMain window = new GUIMain();
    window.frame.setVisible(true);
}

/**
 * Create the application.
 */
public GUIMain() {
    setLookAndFeel();
    initialize();
    controller.start();
}

// The thread controlling changes of panels in the main window. 
private Thread controller = new Thread() { 
    public void run() { 


        SwingUtilities.invokeLater(new Runnable() { 
            public void run() { 

                frame.getContentPane().add(login); 
                addLogo(login);
                frame.revalidate();

            } 
        });


    }
}; 




/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    frame = new JFrame();
    frame.getContentPane().setBackground(Color.BLUE);
    frame.getContentPane().setLayout(new BorderLayout(0, 0));
    frame.setBounds(100, 100, 406, 473);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private void addLogo(JPanel panel) {
    BufferedImage myPicture = null;
    try {
        myPicture = ImageIO.read(new File("C:\Users\Phil\workspace\projFlight\Pictures\WolfLogo.png"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    //The below line was causing the issue
    //frame.getContentPane().setLayout(null);

    JLabel picLabel = new JLabel(new ImageIcon(myPicture));
    picLabel.setBounds(0, 0, 170, 128);
    panel.add(picLabel);

    //frame.getContentPane().add(login);
    login.btnOk.addActionListener(event); //These also shouldn't be here
    login.btnCancel.addActionListener(event); //These also shouldn't be here
}

// method to set the look and feel of the GUI
private void setLookAndFeel() {
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
    } catch (Exception exc) {
        // ignore error
    }
}
}

/**
 * 
 */
package projFlight;

import java.awt.event.ActionListener;
import javax.swing.SwingUtilities;
import java.awt.event.ActionEvent;

/**
 * @author Phil
 *
 */
public class GUIMainEvent implements ActionListener{

GUIMain gui; 

GUIMainEvent(GUIMain in) {
    gui = in;
}

@Override
public void actionPerformed(ActionEvent event) {
    // TODO Auto-generated method stub
    Object source = event.getSource();

    if (source == gui.login.btnOk) {

        gui.frame.getContentPane().remove(gui.login);
        gui.frame.repaint();
        gui.frame.getContentPane().add(gui.custScreen);
        gui.custScreen.setVisible(true);
        gui.frame.repaint();
        gui.frame.revalidate();

    } else if (source == gui.login.btnCancel) {
        System.exit(0);
    }
}

}

package projFlight;

import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.Font;
import javax.swing.JTextField;  
import javax.swing.UIManager;
import javax.swing.JPasswordField;
import javax.swing.JButton;

public class GUILoginScreen extends JPanel {
/**
 * 
 */
private static final long serialVersionUID = 1L;
JTextField tboUsername;
JPasswordField passwordField;
JButton btnOk;
JButton btnCancel;

/**
 * Create the panel.
 */
public GUILoginScreen() {
    setBackground(Color.DARK_GRAY);
    setLayout(null);
    setLookAndFeel();



    JLabel lblUsername = new JLabel("Username");
    lblUsername.setFont(new Font("Segoe UI Black", Font.ITALIC, 18));
    lblUsername.setBounds(77, 170, 109, 35);
    add(lblUsername);

    JLabel lblPassword = new JLabel("Password");
    lblPassword.setFont(new Font("Segoe UI Black", Font.ITALIC, 18));
    lblPassword.setBounds(77, 235, 109, 35);
    add(lblPassword);

    tboUsername = new JTextField();
    tboUsername.setFont(new Font("Segoe UI Black", Font.ITALIC, 18));
    tboUsername.setBounds(77, 203, 241, 31);
    add(tboUsername);
    tboUsername.setColumns(10);

    passwordField = new JPasswordField();
    passwordField.setFont(new Font("Segoe UI Black", Font.ITALIC, 18));
    passwordField.setBounds(77, 268, 241, 31);
    add(passwordField);

    btnOk = new JButton("OK");
    btnOk.setFont(new Font("Segoe UI Black", Font.ITALIC, 18));
    btnOk.setBounds(77, 349, 109, 35);
    add(btnOk);


    btnCancel = new JButton("Cancel");
    btnCancel.setFont(new Font("Segoe UI Black", Font.ITALIC, 18));
    btnCancel.setBounds(209, 349, 109, 35);
    add(btnCancel);


}

// method to set the look and feel of the GUI
    private void setLookAndFeel() {
        try {
                UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
        } catch (Exception exc) {
            // ignore error
        }
    }
}

package projFlight;

import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Font;

public class GUICustomerScreen extends JPanel {

/**
 * 
 */
private static final long serialVersionUID = 1L;
/**
 * Create the panel.
 */

String firstName = "Phil";

public GUICustomerScreen() {
    setLayout(null);

    JLabel lblHello = new JLabel("Hello " + firstName);
    lblHello.setFont(new Font("Segoe UI Black", Font.ITALIC, 14));
    lblHello.setBounds(184, 11, 107, 27);
    add(lblHello);

}

}

camickr · Accepted Answer

I though I could just use JPanels and swap them as required,

You can use a CardLayout to do this.

Check out the section from the Swing tutorial on How to Use CardLayout for a working demo.

Multiple JPanel Java Application Windows

Answers (2)

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