A sample modal dialog that displays a message and waits for the user to click the Ok button
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
/**
* @version 1.33 2007-06-12
* @author Cay Horstmann
*/
public class DialogTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
DialogFrame frame = new DialogFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* A frame with a menu whose File->About action shows a dialog.
*/
class DialogFrame extends JFrame
{
public DialogFrame()
{
setTitle("DialogTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// construct a File menu
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu fileMenu = new JMenu("File");
menuBar.add(fileMenu);
// add About and Exit menu items
// The About item shows the About dialog
JMenuItem aboutItem = new JMenuItem("About");
aboutItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
if (dialog == null) // first time
dialog = new AboutDialog(DialogFrame.this);
dialog.setVisible(true); // pop up dialog
}
});
fileMenu.add(aboutItem);
// The Exit item exits the program
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
});
fileMenu.add(exitItem);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 200;
private AboutDialog dialog;
}
/**
* A sample modal dialog that displays a message and waits for the user to click the Ok button.
*/
class AboutDialog extends JDialog
{
public AboutDialog(JFrame owner)
{
super(owner, "About DialogTest", true);
// add HTML label to center
add(
new JLabel(
"<html><h1><i>Core Java</i></h1><hr>By Cay Horstmann and Gary Cornell</html>"),
BorderLayout.CENTER);
// Ok button closes the dialog
JButton ok = new JButton("Ok");
ok.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
setVisible(false);
}
});
// add Ok button to southern border
JPanel panel = new JPanel();
panel.add(ok);
add(panel, BorderLayout.SOUTH);
setSize(250, 150);
}
}
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