Button for closing a JDialog

Question

I want to add a button (JButton) at the bottom of a JDialog which should close the JDialog when pressed. The problem is I don\'t know what to write in the ActionListener of

Answer 1

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

public class YourDialog extends JDialog implements ActionListener {

  JButton button;

  public YourDialog() {
     button = new JButton("Close");
     button.addActionListener(this);
     add(button);
     pack();
     setVisible(true);
  }

  public void actionPerformed(ActionEvent e) {
      dispose();
  }
}

• close only dialolg using dispose() method parent frame not closed. reason that JVM not terminated.

Answer 2

I have done this slightly differently and it serves the purpose. I have several classes. They extend JPanel, serve different purposes and use JDialogs to get users' inputs.

A typical class would contain necessary fields, save and cancel buttons.

public class EnterpriseGUI extends javax.swing.JPanel {...} would look like this:

Class EnterpriseGUI has a private variable jdialog and a method to set jdialog. Also ActionEvent for 'save' button and 'cancel' button.

private JDialog jdialog;
public void setJDialog(JDialog jdialog) {
    this.jdialog = jdialog;
}
private void btnSaveActionPerformed(java.awt.event.ActionEvent evt) {                                        
    // Do your stuff..
    jdialog.dispose();
} 
private void btnCancelActionPerformed(java.awt.event.ActionEvent evt) {                                          
    // Discard your stuff..
    jdialog.dispose();
} 

Finally, I create an instance of EnterpriseGUI from any other class as needed and embed it into JDialog.

Class OtherClass{
private JDialog dialog;
private EnterpriseGUI = new enterprisegui();
    private void button1ActionPerformed(java.awt.event.ActionEvent evt) {                                             
        this.dialog = new JDialog(this, "My dialog", true);
        this.dialog.setResizable(false);
        enterprisegui.setJDialog(dialog);
        this.dialog.getContentPane().add(enterprisegui);
        this.dialog.pack();

        Dimension Size = Toolkit.getDefaultToolkit().getScreenSize();
        this.dialog.setLocation(new Double((Size.getWidth()/2) - 
                (dialog.getWidth()/2)).intValue(), new Double((Size.getHeight()/2) - 
                        (dialog.getHeight()/2)).intValue());
        this.dialog.setVisible(true);

    }  
}

Answer 3

In addition to other answers, you can set it as the default button for the dialog root pane:

JButton myButton = new JButton("Close");
myButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        dispose(); // Or whatever else
        setVisible(false);
    }
});
getRootPane().setDefaultButton(myButton);

That way, its ActionListener will be called whenever Enter is pressed.

Answer 4

In the actionPerformed() method of ActionListener you'll want something like:

dialog.setVisible(false);

If you want to get rid of the dialog permanently (free it from memory) then you would also call:

dialog.dispose(); 

...where dialog is the name of your dialog. If dialog is a local variable, you'll need to make it final to access it in this way (or just make sure it's "effectively final" from Java 8 onwards).

If you're adding the button as part of a subclass of JDialog (i.e. if you've got class MyDialog extends JDialog and you're adding the action listener in MyDialog) you'll want:

MyDialog.this.setVisible(false);

Answer 5

You can have the ActionListener dispatch a WindowEvent.WINDOW_CLOSING, as shown here.