I have a problem with JFrame. All I want to do is to create a JFrame for Login with a Button, and when the Button is pressed: it close the Login Frame and opens the Program Frame.
This is my Login Frame:
public static void main(String[] args) {
JFrame frame = new JFrame("My Program");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
LoginPanel primary = new LoginPanel(frame);
frame.setPreferredSize (new Dimension (650, 500));
frame.getContentPane().add(primary);
frame.pack();
frame.setVisible(true);
}
Which opens the Login Panel by passing the Frame in the constructor, the Login Panel:
public class LoginPanel extends JPanel {
JFrame fr;
class submitButton implements ActionListener {
public void actionPerformed(ActionEvent e) {
ProgramFrame programFrame = new ProgramFrame();
programFrame.setVisible(true);
fr.setVisible(false);
fr.dispose();
}
}
public LoginPanel(JFrame frame) {
fr = frame;
JButton submit = new JButton("Button Login");
submit.addActionListener(new submitButton());
add(submit);
}
This is the problem:
When I click on the Button "Button Login" of the LoginPanel, it succesfully opens the new ProgramFrame but it doesn't close at all the old frame (LoginFrame). The LoginFrame becomes smaller, very little, but remains:
Thanks in advance for the help! :)
class submitButton implements ActionListener {
public void actionPerformed(ActionEvent e) {
ProgramFrame programFrame = new ProgramFrame();
programFrame.setVisible(true);
this.dispose(); //changed line
}
}
well your panel is closed bt the jframe is still opened without the jpanel
i have made some changes to your code now both will disposed at the same time
You first initialise JFrame completely, so after inside JButton click event first hide JFrame later dispose it.
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class HideLoginPage{
public static void main(String[] args){
HideLoginPage loginPage = new HideLoginPage();
JFrame frame = new JFrame();
frame.setUndecorated(true);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setBounds(200, 200, 200, 100);
loginPage.setPane(frame);
frame.setVisible(true);
}
public void setPane(final JFrame frame){
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
JButton submit = new JButton("Login");
submit.setSize(100, 30);
panel.add(submit);
submit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
JFrame newFrame = new JFrame();
newFrame.setBounds(400, 200, 400, 400);
newFrame.setVisible(true);
frame.setVisible(false);
frame.dispose();
}
});
frame.getContentPane().add(panel);
}
}
Related
On button click, I am creating new JFrame, adding a JButton inside it and setting it visible. JFrame is visible but the JButton is not visible.
I tried finding answers on stackoverflow but everyone says to set the JFrame visible after adding the components. I did that also but still, the issue is not solved
below is button code
#Override
public void actionPerformed(ActionEvent arg0) {
popup.showPopup();
}
I have made a class named "popup" with a show popup method.
Below is the code of popup.java class
package justin;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class popupFrame {
private JFrame f = new JFrame("Please wait...");
public void showPopup() {
System.out.println("Showing Popup");
f.setSize(300, 150);
f.setLayout(new FlowLayout());
f.add(new JButton("Test"));
f.setVisible(true);
}
}
It should show the JFrame with items added in it on the click of button.
Please check the below link for my complete code:
https://github.com/jamesfdz/Justin-code
Since I can't see the rest of your code, I have posted an example instead.
public class ControlInterface{
public ControlInterface() {
JFrame frame = new JFrame();
frame.setSize(400, 400);
frame.add(new JButton("Test"));
frame.setVisible(true);
}
}
And the calling class:
public class BusinessLogic{
public static void main(String[] args){
JFrame frame = new JFrame();
frame.setSize(300, 300);
JButton button = new JButton("Popup");
frame.add(button);
frame.setVisible(true);
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == button) {
new ControlInterface();
}
}
});
}
}
This question already has answers here:
Opening a new JFrame from a Button
(4 answers)
Closed 6 years ago.
I know this has been asked thousands of times, but I have never found an answer that works for me. I'm using Java IDE for Java Developers (Eclipse Kepler).
I need to have a JButton which by clicking it, it will close the JFrame that the button is on, and opens a new one that exists in a different class. I have this:
JButton button = new JButton("Click Me!");
add(button);
button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e) {
}
});
}
I have no idea what to put after the actionPerformed. And frame.dispose(); does not work for me.
I'm asking, how do I close the JFrame with a JButton, and by clicking the same button it also opens a new class's JFrame?
Here's an example that may help:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class MyFrame extends JFrame {
public MyFrame() {
setLayout(new BorderLayout());
getContentPane().setPreferredSize(new Dimension(400, 250));
JButton btn = new JButton("Click Me");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
JFrame frame2 = new JFrame();
frame2.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame2.setLocation(300, 150);
frame2.add(new JLabel("This is frame2."));
frame2.setVisible(true);
frame2.setSize(200, 200);
}
} );
add(btn,BorderLayout.SOUTH);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
MyFrame frame = new MyFrame();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocation(150, 150);
frame.add(new JLabel("This is frame1."), BorderLayout.NORTH);
frame.setVisible(true);
}
});
}
}
I am trying to create a GUI with a couple of buttons and a drawing area.
it seems to be working except the drawing area is very small and not in the right location.
here is my code:
public class ssGUI extends JPanel implements ActionListener{
private static final long serialVersionUID = 1L;
protected JButton b1, bConnect, bDisconnect, b2;
protected JPanel canvas;
public ssGUI() {
// run button
b1 = new JButton("do something");
b1.setVerticalTextPosition(AbstractButton.CENTER);
b1.setHorizontalTextPosition(AbstractButton.LEADING);
b1.setMnemonic(KeyEvent.VK_D);
b1.addActionListener(this);
b1.setEnabled(false);
// connect button
bConnect = new JButton("Connect");
bConnect.setMnemonic(KeyEvent.VK_E);
bConnect.addActionListener(this);
bConnect.setEnabled(true);
// disconnect button
bDisconnect = new JButton("Disconnect");
bDisconnect.setMnemonic(KeyEvent.VK_E);
bDisconnect.addActionListener(this);
bDisconnect.setEnabled(false);
// clean nmea data button
b2 = new JButton("do something else");
b2.setMnemonic(KeyEvent.VK_E);
b2.addActionListener(this);
b2.setEnabled(false);
// drawing panel
canvas = new JPanel();
canvas.setBackground(Color.white);
add(b1); add(bConnect); add(bDisconnect); add(b2); add(canvas, BorderLayout.CENTER);
}
public static void createAndShowGUI() {
JFrame frame = new JFrame("Range Adjustment GUI");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ssGUI newContentPane = new ssGUI();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
frame.setLocation(500, 500);
frame.setSize(500, 500);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}}
this is how my GUI looks like:
as you can see, the "canvas" is very small and at the side of the buttons.
i need it to be placed underneath them and fill frame area.
can anyone help me to resolve that problem?
thank you for your help.
Set your main panel's layout to BorderLayout.
Create a panel just for your buttons and add this panel to your main panel's NORTH position.
Here is a working example:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ssGUI extends JPanel implements ActionListener {
private static final long serialVersionUID = 1L;
protected JButton b1, bConnect, bDisconnect, b2;
protected JPanel canvas;
public ssGUI() {
setLayout(new BorderLayout());
// run button
b1 = new JButton("do something");
b1.setVerticalTextPosition(AbstractButton.CENTER);
b1.setHorizontalTextPosition(AbstractButton.LEADING);
b1.setMnemonic(KeyEvent.VK_D);
b1.addActionListener(this);
b1.setEnabled(false);
// connect button
bConnect = new JButton("Connect");
bConnect.setMnemonic(KeyEvent.VK_E);
bConnect.addActionListener(this);
bConnect.setEnabled(true);
// disconnect button
bDisconnect = new JButton("Disconnect");
bDisconnect.setMnemonic(KeyEvent.VK_E);
bDisconnect.addActionListener(this);
bDisconnect.setEnabled(false);
// clean nmea data button
b2 = new JButton("do something else");
b2.setMnemonic(KeyEvent.VK_E);
b2.addActionListener(this);
b2.setEnabled(false);
// drawing panel
canvas = new JPanel();
canvas.setBackground(Color.white);
JPanel topPanel = new JPanel();
topPanel.add(b1);
topPanel.add(bConnect);
topPanel.add(bDisconnect);
topPanel.add(b2);
add(topPanel, BorderLayout.NORTH);
add(canvas, BorderLayout.CENTER);
}
public static void createAndShowGUI() {
JFrame frame = new JFrame("Range Adjustment GUI");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ssGUI newContentPane = new ssGUI();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
frame.setLocation(500, 500);
frame.setSize(500, 500);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
#Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
}
}
This is another problem with the layouts.
JPanel has a default layout and I don't see you setting the layout for ssGUI class. Hence the default layout (FlowLayout) will be used.
All components added to ssGUI will be arranged in a linear fashion in a row for as much as it can hold. When your component exceed the width, it will be placed to the next row.
You can consider using a layout for your main panel ssGUI. A GridBagLayout will probably give you what you want.
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);
}
}
i'm developing a JFrame which has a button to show another JFrame. On the second JFrame i want to override WindowsClosing event to hide this frame but not close all the application. So i do like this:
On second JFrame
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
formWindowClosing(evt);
}
});
private void formWindowClosing(java.awt.event.WindowEvent evt) {
this.dispose();
}
but application still close when i click x button on the windows. why? can you help me?
I can't use
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
because i need to show again that JFrame with some information added in it during operations from first JFrame. So i init second JFrame with attribute visible false. if i use dispose i lose the information added in a second moment by the other JFrame. so i use
private void formWindowClosing(java.awt.event.WindowEvent evt) {
this.setVisible(false);
}
but it still continue to terminate my entire app.
don't create a new JFrame, for new container use JDialog, if you want to hide the JFrame then better would be override proper e.g DefaultCloseOperations(JFrame.HIDE_ON_CLOSE), method JFrame.EXIT_ON_CLOSE teminating current JVM instance simlair as calll for System.exit(int)
EDIT
but it still continue to terminate my entire app.
1) then there must be another issue, your code maybe call another JFrame or formWindowClosing <> WindowClosing, use implemented method from API
public void windowClosing(WindowEvent e) {
2) I'b preferred DefaultCloseOperations(JFrame.HIDE_ON_CLOSE),
3) use JDialog instead of JFrame
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ClosingFrame extends JFrame {
private JMenuBar MenuBar = new JMenuBar();
private static JFrame frame = new JFrame();
private static JFrame frame1 = new JFrame("DefaultCloseOperation(JFrame.HIDE_ON_CLOSE)");
private static final long serialVersionUID = 1L;
private JMenu File = new JMenu("File");
private JMenuItem Exit = new JMenuItem("Exit");
public ClosingFrame() {
File.add(Exit);
MenuBar.add(File);
Exit.addActionListener(new ExitListener());
WindowListener exitListener = new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
frame.setVisible(false);
/*int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == JOptionPane.YES_OPTION) {
System.exit(1);
}*/
}
};
JButton btn = new JButton("Show second JFrame");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frame1.setVisible(true);
}
});
frame.add(btn, BorderLayout.SOUTH);
frame.addWindowListener(exitListener);
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame.setJMenuBar(MenuBar);
frame.setPreferredSize(new Dimension(400, 300));
frame.setLocation(100, 100);
frame.pack();
frame.setVisible(true);
}
private class ExitListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == JOptionPane.YES_OPTION) {
System.exit(1);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
ClosingFrame cf = new ClosingFrame();
JButton btn = new JButton("Show first JFrame");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frame.setVisible(true);
}
});
frame1.add(btn, BorderLayout.SOUTH);
frame1.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame1.setPreferredSize(new Dimension(400, 300));
frame1.setLocation(100, 400);
frame1.pack();
frame1.setVisible(true);
}
});
}
}
Adding a New Code with no WindowListener part as explained by #JBNizet, the very right thing. The default behaviour just hides the window, nothing is lost, you simply have to bring it back, every value inside it will remain as is, below is the sample program for further help :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TwoFrames
{
private SecondFrame secondFrame;
private int count = 0;
private void createAndDisplayGUI()
{
JFrame frame = new JFrame("JFRAME 1");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
secondFrame = new SecondFrame();
secondFrame.createAndDisplayGUI();
secondFrame.tfield.setText("I will be same everytime.");
JPanel contentPane = new JPanel();
JButton showButton = new JButton("SHOW JFRAME 2");
showButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
secondFrame.tfield.setText(secondFrame.tfield.getText() + count);
count++;
if (!(secondFrame.isShowing()))
secondFrame.setVisible(true);
}
});
frame.add(contentPane, BorderLayout.CENTER);
frame.add(showButton, BorderLayout.PAGE_END);
frame.setSize(200, 200);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new TwoFrames().createAndDisplayGUI();
}
});
}
}
class SecondFrame extends JFrame
{
private WindowAdapter windowAdapter;
public JTextField tfield;
public void createAndDisplayGUI()
{
setLocationByPlatform(true);
JPanel contentPane = new JPanel();
tfield = new JTextField(10);
addWindowListener(windowAdapter);
contentPane.add(tfield);
getContentPane().add(contentPane);
setSize(300, 300);
}
}
Is this what you want, try this code :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TwoFrames
{
private SecondFrame secondFrame;
private void createAndDisplayGUI()
{
JFrame frame = new JFrame("JFRAME 1");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
secondFrame = new SecondFrame();
secondFrame.createAndDisplayGUI();
secondFrame.tfield.setText("I will be same everytime.");
JPanel contentPane = new JPanel();
JButton showButton = new JButton("SHOW JFRAME 2");
showButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (!(secondFrame.isShowing()))
secondFrame.setVisible(true);
}
});
frame.add(contentPane, BorderLayout.CENTER);
frame.add(showButton, BorderLayout.PAGE_END);
frame.setSize(200, 200);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new TwoFrames().createAndDisplayGUI();
}
});
}
}
class SecondFrame extends JFrame
{
private WindowAdapter windowAdapter;
public JTextField tfield;
public void createAndDisplayGUI()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationByPlatform(true);
JPanel contentPane = new JPanel();
tfield = new JTextField(10);
windowAdapter = new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
}
};
addWindowListener(windowAdapter);
contentPane.add(tfield);
getContentPane().add(contentPane);
setSize(300, 300);
}
}
You could avoid the listener completely and use
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
Note that the default value is HIDE_ON_CLOSE, so the behavior you want should be the default behavior. Maybe you registered another listener that exits the application.
See http://docs.oracle.com/javase/6/docs/api/javax/swing/JFrame.html#setDefaultCloseOperation%28int%29
It's hard to pinpoint exactly why you are experiencing the behavior stated without seeing a little more of the set-up code, however it may be due to defaultCloseOperation set to EXIT_ON_CLOSE.
Here's a link to a demo displaying the properties you are looking for although the structure is a bit different. Have a look: http://docs.oracle.com/javase/tutorial/uiswing/examples/components/FrameworkProject/src/components/Framework.java