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Is there a way to reference setVisible() and dispose() from an ActionListener in a separate class file?

I'm working on a very complicated, multi-layered Swing GUI, and the main issue I'm running into right now involves having a JButton ActionListener perform setVisible() on a separate JFrame and immediately dispose() of the current JFrame. Because of the length of my code, it's important that main, both JFrames, and the ActionListener are all split into individual class files. I wrote a VERY simplified version of my problem, split into 4 tiny class files. Here they are:
File 1:
import javax.swing.*;
public class Test {
public static void main(String[] args) {
JFrame g1 = new GUI1();
g1.pack();
g1.setLocation(200,200);
g1.setVisible(true);
JFrame g2 = new GUI2();
g2.pack();
g2.setLocation(400,200);
g2.setVisible(false);
}
}
File 2:
import javax.swing.*;
public class GUI1 extends JFrame {
JPanel panel;
JButton button;
public GUI1() {
super("GUI1");
setDefaultCloseOperation(EXIT_ON_CLOSE);
panel = new JPanel();
button = new JButton("Create GUI2");
button.addActionListener(new Listener());
add(panel);
add(button);
}
}
File 3:
import javax.swing.*;
public class GUI2 extends JFrame {
JPanel panel;
JLabel label;
public GUI2() {
super("GUI2");
setDefaultCloseOperation(EXIT_ON_CLOSE);
panel = new JPanel();
label = new JLabel("I'm alive!");
add(panel);
add(label);
}
}
File 4:
import java.awt.event.*;
public class Listener implements ActionListener {
public void actionPerformed(ActionEvent e) {
GUI2.setVisible(true);
GUI1.dispose();
}
}
As you can see, the only function of the ActionListener is to set GUI2 to visible and dispose of GUI1, but it runs the error "non-static method (setVisible(boolean) and dispose()) cannot be referenced from a static context". I figure this is because both methods are trying to reference objects that were created in main, which is static. My confusion is how to get around this, WITHOUT combining everything into one class.
Any suggestions? Thanks!
EDIT:
Here's the above code compiled into one file... although it returns the exact same error.
import javax.swing.*;
import java.awt.event.*;
public class Test {
public static void main(String[] args) {
JFrame g1 = new GUI1();
g1.pack();
g1.setLocation(200,200);
g1.setVisible(true);
JFrame g2 = new GUI2();
g2.pack();
g2.setLocation(400,200);
g2.setVisible(false);
}
}
class GUI1 extends JFrame {
JPanel panel;
JButton button;
public GUI1() {
super("GUI1");
setDefaultCloseOperation(EXIT_ON_CLOSE);
panel = new JPanel();
button = new JButton("Create GUI2");
button.addActionListener(new Listener());
add(panel);
add(button);
}
}
class GUI2 extends JFrame {
JPanel panel;
JLabel label;
public GUI2() {
super("GUI2");
setDefaultCloseOperation(EXIT_ON_CLOSE);
panel = new JPanel();
label = new JLabel("I'm alive!");
add(panel);
add(label);
}
}
class Listener implements ActionListener {
public void actionPerformed(ActionEvent e) {
GUI2.setVisible(true);
GUI1.dispose();
}
}

You have to pass instances of frame1 and frame2 to your ActionListener.
import java.awt.event.*;
public class Listener implements ActionListener {
private JFrame frame1, frame2;
public Listener(JFrame frame1, JFrame frame2) {
this.frame1 = frame1;
this.frame2 = frame2;
}
public void actionPerformed(ActionEvent e) {
frame2.setVisible(true);
frame1.dispose();
}
}
This means you have to pass an instance of frame2 to your GUI1 class.
import javax.swing.*;
public class GUI1 extends JFrame {
JPanel panel;
JButton button;
public GUI1(JFrame frame2) {
super("GUI1");
setDefaultCloseOperation(EXIT_ON_CLOSE);
panel = new JPanel();
button = new JButton("Create GUI2");
button.addActionListener(new Listener(this, frame2));
add(panel);
add(button);
}
}
This means you have to create the frames in the reverse order.
import javax.swing.*;
public class Test {
public static void main(String[] args) {
JFrame g2 = new GUI2();
g2.pack();
g2.setLocation(400,200);
g2.setVisible(false);
JFrame g1 = new GUI1(g2);
g1.pack();
g1.setLocation(200,200);
g1.setVisible(true);
}
}

How to request focus on JComponent after changing JPanel in JFrame

I have these two classes:
class Test:
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Test {
//frame
private static JFrame frame = new JFrame() {
private static final long serialVersionUID = 1L;
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 200);
setLocationRelativeTo(null);
setLayout(new BorderLayout());
viewPanel = new JPanel(new BorderLayout());
add(viewPanel);
}
};
private static JPanel viewPanel;
//change the panels
public static void showView(JPanel panel) {
viewPanel.removeAll();
viewPanel.add(panel, BorderLayout.CENTER);
viewPanel.revalidate();
viewPanel.repaint();
}
//main method
public static void main (String [] args) {
SwingUtilities.invokeLater(() -> showView(Panels.panel1));
SwingUtilities.invokeLater(() -> {
frame.setVisible(true);
});
}
}
class Panels:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
//panels
public class Panels {
//first panel
static JPanel panel1 = new JPanel() {
private static final long serialVersionUID = 1L;
{
JButton button = new JButton("Click here!");
add(button);
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
SwingUtilities.invokeLater(() -> Test.showView(panel2));
}
});
}
};
//second panel
static JPanel panel2 = new JPanel() {
private static final long serialVersionUID = 1L;
{
JTextField textField = new JTextField(5);
add(textField);
}
};
}
And as you can see, the JPanel changes inside the JFrame, after clicking the JButton: How can I change the JPanel from another Class?
But how can I now set the focus on the JTextField, after changing panel1 to panel2?
I've tried to add grabFocus(); to the JTextField, but it didn't work and requestFocus(); didn't work as well.
Thanks in advance!

There's no need to call showView(...) with invokeLater. Your ActionListener is being called on the EDT, so this is unnecessary code.
If you had a handle to the JTextField, you could call requestFocusInWindow() on it after making it visible, and it should have focus.
For example:
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
// SwingUtilities.invokeLater(() -> Test.showView(panel2)); // not needed
Test.showView(panel2);
Component[] comps = panel2.getComponents();
if (comps.length > 0) {
comps[0].requestFocusInWindow();
}
}
});
Myself, I would use CardLayout to do my swapping and would not use the kludge of getting components via getComponents() but rather using much less brittle method calls.
For example:
import java.awt.CardLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.*;
#SuppressWarnings("serial")
public class MyPanelTest extends JPanel {
private TextFieldPanel textFieldPanel = new TextFieldPanel();
private CardLayout cardLayout = new CardLayout();
public MyPanelTest() {
JPanel buttonPanel = new JPanel();
buttonPanel.add(new JButton(new ButtonAction("Press Me")));
setPreferredSize(new Dimension(400, 200));
setLayout(cardLayout);
add(buttonPanel, "button panel");
add(textFieldPanel, TextFieldPanel.NAME);
}
private class ButtonAction extends AbstractAction {
public ButtonAction(String name) {
super(name);
}
#Override
public void actionPerformed(ActionEvent e) {
cardLayout.show(MyPanelTest.this, TextFieldPanel.NAME);
textFieldPanel.textFieldRequestFocus();
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame("My Panel Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new MyPanelTest());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
#SuppressWarnings("serial")
class TextFieldPanel extends JPanel {
public static final String NAME = "TEXT_FIELD_PANEL";
private JTextField textField = new JTextField(10);
public TextFieldPanel() {
add(textField);
}
public void textFieldRequestFocus() {
textField.requestFocusInWindow();
}
}

How can I change the JPanel from another Class?

Hi, I'm new to Java and I have the following problem:
I created a JFrame and I want the JPanel to change when clicking a JButton. That does almost work.The only problem is that the program creates a new window and then there are two windows. One with the first JPanel and one with the second JPanel.
Here is my current code:
first class:
public class Program {
public static void main (String [] args) {
new window(new panel1());
}
}
second class:
import java.awt.Toolkit;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Window extends JFrame {
private static final long serialVersionUID = 1L;
Window(JPanel panel) {
setLocation((int) Toolkit.getDefaultToolkit().getScreenSize().getWidth() / 2 - 200,
(int) Toolkit.getDefaultToolkit().getScreenSize().getHeight() / 2 - 100);
setSize(400, 200);
setTitle("test");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
setContentPane(panel);
setVisible(true);
}
}
third class:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
public class Panel1 extends JPanel {
private final long serialVersionUID = 1L;
Panel1() {
JButton nextPanelButton = new JButton("click here");
add(nextPanelButton);
ActionListener changePanel = new ActionListener() {
#Override
public void actionPerformed(ActionEvent event) {
new window(new panel2());
}
};
nextPanelButton.addActionListener(changePanel);
}
}
fourth class:
public class Panel2 extends JPanel {
private static final long serialVersionUID = 1L;
Panel2() {
JLabel text = new JLabel("You pressed the Button!");
add(text);
}
}
But I just want to change the JPanel without opening a new window. Is there a way to do that?
Thanks in advance!

This is a demo
import javax.swing.*;
public class Main {
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
new MainFrame("Title").setVisible(true);
});
}
}
MainFrame.java
import javax.swing.*;
import java.awt.*;
public class MainFrame extends JFrame {
private JPanel viewPanel;
public MainFrame(String title) {
super(title);
createGUI();
}
private void createGUI() {
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setLayout(new BorderLayout());
setMinimumSize(new Dimension(600, 480));
viewPanel = new JPanel(new BorderLayout());
add(viewPanel, BorderLayout.CENTER);
showView(new View1(this));
pack();
}
public void showView(JPanel panel) {
viewPanel.removeAll();
viewPanel.add(panel, BorderLayout.CENTER);
viewPanel.revalidate();
viewPanel.repaint();
}
}
View1.java
import javax.swing.*;
import java.awt.*;
public class View1 extends JPanel {
final private MainFrame owner;
public View1(MainFrame owner) {
super();
this.owner = owner;
createGUI();
}
private void createGUI() {
setLayout(new FlowLayout());
add(new JLabel("View 1"));
JButton button = new JButton("Show View 2");
button.addActionListener(event -> {
SwingUtilities.invokeLater(() -> owner.showView(new View2(owner)));
});
add(button);
}
}
View2.java
import javax.swing.*;
import java.awt.*;
public class View2 extends JPanel {
final private MainFrame owner;
public View2(MainFrame owner) {
super();
this.owner = owner;
createGUI();
}
private void createGUI() {
setLayout(new FlowLayout());
add(new JLabel("View 2"));
JButton button = new JButton("Show View 1");
button.addActionListener(event -> {
SwingUtilities.invokeLater(() -> owner.showView(new View1(owner)));
});
add(button);
}
}

First of all, take a look at Java naming conventions, in particular your class names should start with a capitalized letter.
If you want to avoid to open a new window every time you click the button, you could pass your frame object to Panel1 constructor, and setting a new Panel2 instance as the frame content pane when you click the button. There is also no need to pass Panel1 to Window constructor (please note that Window class is already defined in java.awt package, it would be better to avoid a possible name clash renaming your class ApplicationWindow, MyWindow or something else).
You could change your code like this (only relevant parts):
public class Program
{
public static void main (String [] args) {
SwingUtilities.invokeLater (new Runnable () {
#Override public void run () {
new Window ().setVisible (true);
}
};
}
}
class Window extends JFrame
{
// ...
Window () {
// ...
setContentPane(new Panel1 (this));
}
}
class Panel1 extends JPanel
{
// ...
Panel1 (JFrame parent) {
// ...
ActionListener changePanel = new ActionListener() {
#Override
public void actionPerformed(ActionEvent event) {
parent.setContentPane (new Panel2 ());
}
};
// ...
}
Also note the SwingUtilities's invokeLater call, which is the best way to initialise your GUI in the EDT context (for more info look at this question).
Finally, you could avoid to create a new Panel2 instance every time you click the button, simply by using a CardLayout.
Take a look at the official tutorial.

This is an old post, but it may be useful to answer it in a simplified way. Thanks to mr mcwolf for the first answer.
If we want to make 1 child jframe interact with a main jframe in order to modify its content, let's consider the following case.
parent.java and child.java.
So, in parent.java, we have something like this:
Parent.java
public class Parent extends JFrame implements ActionListener{
//attributes
//here is the class we want to modify
private some_class_to_modify = new some_class_to_modify();
//here is a container which contains the class to modify
private JPanel container = new JPanel();
private some_class = new some_class();
private int select;
//....etc..etc
//constructor
public Parent(){
this.setTitle("My title");
//etc etc
//etc....etc
container.add(some_class_to_modify,borderLayout.CENTER);
}
//I use for instance actionlisteners on buttons to trigger the new JFrame
public void actionPerformed(ActionEvent arg0){
if((arg0.getSource() == source_button_here)){
//Here we call the child class and send the parent's attributes with "this"
Child child = new Child(this);
}
//... all other cases
}//Here is the class where we want to be able to modify our JFrame. Here ist a JPanel (Setcolor)
public void child_action_on_parent(int selection){
this.select = selection;
System.out.println("Selection is: "+cir_select);
if(select == 0) {
//Do $omething with our class to modify
some_class_to_modify.setcolor(Color.yellow);
}
}
In child.java we would have something like this:
public class Child extends JFrame implements ActionListener {
//Again some attributes here
private blabla;
//Import Parent JFrame class
private Parent owner;
private int select_obj=0;
//Constructor here and via Parent Object Import
public Child(Parent owner){
/*By calling the super() method in the constructor method, we call the parent's
constructor method and gets access to the parent's properties and methods:*/
super();
this.owner = owner;
this.setTitle("Select Method");
this.setSize(400, 400);
this.setContentPane(container);
this.setVisible(true);
}
class OK_Button implements ActionListener {
public void actionPerformed(ActionEvent e) {
Object Selection = select;
if(Selection == something) {
select_obj=0;
valid = JOptionPane.showConfirmDialog(null,"You have chosen option 1. Do you want to continue?","Minimum diameter",2);
}
System.out.println("Option is:"+valid);
if(valid == 0) {
setVisible(false);
//Here we can use our herited object to call the child_action_on_parent public class of the Parent JFrame. So it can modify directly the Panel
owner.child_action_on_parent(select_obj);
}
}
}

Adding new Tab with JTabbedPane through event

I have two classes here: MainScreen and QueryScreen. MainScreen has already implemented one JTabbedPane on int. QueryScreen extended the MainScreen.
I tried to add one tab calling one event through QueryScreen but its not coming up on the app. Checkout please the sample code:
QueryScreen:
public class QueryScreen extends MainScreen {
private JSplitPane engineList;
final JPanel queryList = new JPanel();
public QueryScreen(){
tabbedPane.addTab( "Query List", queryList );
add( tabbedPane, BorderLayout.CENTER );
}
}
MainScreen:
public class MainScreen extends JFrame implements ActionListener {
/**
*
*/
JMenuBar bar;
JMenu file, register;
JMenuItem close, search;
ImageIcon image1= new ImageIcon("rsc/img/logo.jpg");
JLabel lbImage1;
JTabbedPane tabbedPane = new JTabbedPane();
final JPanel entrance = new JPanel();
/**
*
*/
public MainScreen()
{
lbImage1= new JLabel(image1, JLabel.CENTER);
entrance.add(lbImage1);
tabbedPane.addTab( "Entrance", entrance );
add( tabbedPane, BorderLayout.CENTER );
bar= new JMenuBar();
file= new JMenu("File");
register= new JMenu("Search");
close= new JMenuItem("Close");
close.addActionListener(this);
search= new JMenuItem("Request Query");
search.addActionListener(this);
//Keyboard Shortcut
register.setMnemonic(KeyEvent.VK_S);
file.setMnemonic(KeyEvent.VK_F);
search.setMnemonic(KeyEvent.VK_R);
//Ibimage1.setVerticalTextPosition(SwingConstants.CENTER);
bar.add(file);
bar.add(register);
file.add(close);
register.add(search);
setExtendedState(getExtendedState() | JFrame.MAXIMIZED_BOTH); // Maximized Window or setSize(getMaximumSize());
setTitle("SHST");
setJMenuBar(bar);
setDefaultCloseOperation(0);
WindowListener J=new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
};
addWindowListener(J);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==close){
System.exit(0);
}
if(e.getSource()==search){
Search s= new Search();
s.setVisible(true);
}
}
}
ps: the MainScreen object and the setVisible from it is coming from the run class which has only the call for this MainScreen.
How am I able to add this new tab?
Thanks in advance
Edit One:

In the future please post an SSCCE instead of copy/pasting some classes.
Here's an SSCCE of your MainScreen, with the non-essentials stripped out, and a main method added:
import java.awt.*;
import javax.swing.*;
public class MainScreen extends JFrame
{
JTabbedPane tabbedPane = new JTabbedPane();
final JPanel entrance = new JPanel();
public MainScreen()
{
tabbedPane.addTab("Entrance", entrance);
add(tabbedPane, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new MainScreen();
frame.setSize(300, 200);
frame.setVisible(true);
}
});
}
}
... and here's an SSCCE for QueryScreen:
import java.awt.*;
import javax.swing.*;
public class QueryScreen extends MainScreen
{
final JPanel queryList = new JPanel();
public QueryScreen()
{
tabbedPane.addTab("Query List", queryList);
//add( tabbedPane, BorderLayout.CENTER ); /* not needed */
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new QueryScreen();
frame.setSize(300, 200);
frame.setVisible(true);
}
});
}
}
As you can see, this works, and for the most part, all I did was remove unnecessary code and added a main to each.
If you're still having problems, please update your question with an SSCCE and post the specific problem you're having.

How to send an ActionPerformed from an ActionListener to another ActionListener?

I've got a Frame (named here "MainApplication"), which mainly has a JPanel to show informations, depending on the context.
On startup, the MainApplication has an empty JPanel.
It then creates a "LoginRequest" class, which creates a simple login/password form, and send it back to the MainApplication, which displays it in its JPanel.
The "LoginRequest" class implements ActionListener, so when the user clicks on the "Login" button, it checks wheter or not the login/password is correct, and, if the user is granted, I want to unload that form, and display the main screen on the MainApplication Frame.
So, to do it, I came up with this :
public class LoginRequest implements ActionListener {
protected MainApplication owner_m = null;
public LoginRequest(MainApplication owner_p) {
owner_m = owner_p;
}
#Override
public void actionPerformed(ActionEvent event_p) {
// the user just clicked the "Login" button
if (event_p.getActionCommand().equals("RequestLogin")) {
// check if login/password are correct
if (getParameters().isUserGranted(login_l, password_l)) {
// send an ActionEvent to the "MainApplication", so as it will
// be notified to display the next screen
this.owner_m.actionPerformed(
new java.awt.event.ActionEvent(this, 0, "ShowSummary")
);
} else {
messageLabel_m.setForeground(Color.RED);
messageLabel_m.setText("Incorrect user or password");
}
}
}
}
Then, the "MainApplication" class (which extends JFrame) :
public class MainApplication extends JFrame implements ActionListener {
protected void load() {
// create the panel to display information
mainPanel_m = new JPanel();
// on startup, populate the panel with a login/password form
mainPanel_m.add(new LoginRequest(this).getLoginForm());
this.add(mainPanel_m);
}
#Override
public void actionPerformed(ActionEvent event_p) {
// show summary on request
if (event_p.getActionCommand().equals("ShowSummary")) {
// remove the previous information on the panel
// (which displayed the login form on this example)
mainPanel_m.removeAll();
// and populate the panel with other informations, from another class
mainPanel_m.add(...);
...
...
}
// and then refresh GUI
this.validate();
this.repaint();
this.pack();
}
}
When the ActionEvent is sent from the "LoginRequest" class to the "MainApplication" class, it executes the code, but at the end, nothing happens, as if the JFrame wasn't repainted.
Any ideas ?
Thanks,

The best way would be to use JDialog (main frame JFrame would be a parent component) for login form and CardLayout to switch between panels (so there is no need for removing, repainting and revalidating):
Your main form should look something like this:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class MainFrame{
JFrame frame = new JFrame("Main frame");
JPanel welcomePanel = new JPanel();
JPanel workspacePanel = new JPanel();
JPanel cardPanel = new JPanel();
JButton btnLogin = new JButton("Login");
JLabel lblWelcome = new JLabel("Welcome to workspace");
CardLayout cl = new CardLayout();
LoginRequest lr = new LoginRequest(this);
public MainFrame() {
welcomePanel.add(btnLogin);
btnLogin.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
lr.setVisible(true);
}
});
workspacePanel.add(lblWelcome);
cardPanel.setLayout(cl);
cardPanel.add(welcomePanel, "1");
cardPanel.add(workspacePanel, "2");
cl.show(cardPanel,"1");
frame.getContentPane().add(cardPanel);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setPreferredSize(new Dimension(320,240));
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String [] args){
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new MainFrame();
}
});
}
}
Your login form should look something like this:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class LoginRequest extends JDialog{
/**You can add, JTextFields, JLabel, JPasswordField..**/
JPanel panel = new JPanel();
JButton btnLogin = new JButton("Login");
public LoginRequest(final MainFrame mf) {
setTitle("Login");
panel.add(btnLogin);
btnLogin.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
//Put some login logic here
mf.cl.show(mf.cardPanel,"2");
dispose();
}
});
add(panel, BorderLayout.CENTER);
setModalityType(ModalityType.APPLICATION_MODAL);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
pack();
setLocationByPlatform(true);
}
}
EDIT:
Your way:
MainFrame class:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class MainFrame{
JFrame frame = new JFrame("Main frame");
JPanel welcomePanel = new JPanel();
JPanel workspacePanel = new JPanel();
JPanel cardPanel = new JPanel();
JButton btnLogin = new JButton("Login");
JLabel lblWelcome = new JLabel("Welcome");
LoginRequest lr = new LoginRequest(this);
public MainFrame() {
welcomePanel.add(btnLogin);
btnLogin.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
lr.setVisible(true);
}
});
workspacePanel.add(lblWelcome);
frame.getContentPane().add(welcomePanel);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setPreferredSize(new Dimension(320,240));
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String [] args){
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new MainFrame();
}
});
}
}
LoginRequest class:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class LoginRequest extends JDialog{
/**You can add, JTextFields, JLabel, JPasswordField..**/
JPanel panel = new JPanel();
JButton btnLogin = new JButton("Login");
public LoginRequest(final MainFrame mf) {
setTitle("Login");
panel.add(btnLogin);
btnLogin.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
//Put some login logic here
mf.frame.getContentPane().removeAll();
mf.frame.add(mf.workspacePanel);
mf.frame.repaint();
mf.frame.revalidate();
dispose();
}
});
add(panel, BorderLayout.CENTER);
setModalityType(ModalityType.APPLICATION_MODAL);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
pack();
setLocationByPlatform(true);
}
}