This is an example on how to create a JFrame window with window close event. Pairing a window with a closing event is a very common practice in most GUI applications. When the user closes a window, it usually means that you have to release several resources or event exit the application.
The basic steps to create a JFrame with a window closing event is:
- Create a class that extends
JFrame. - Create a class that extends
WindowAdapter. - Override the
windowClosingmethod. Now every time the window closes, this method will fire up.
Let’s take a look at the code snippets that follow:
package com.javacodegeeks.snippets.desktop;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
public class CreateJFrameWindowWithWindowCloseEvent extends JFrame {
private static final long serialVersionUID = 1L;
public CreateJFrameWindowWithWindowCloseEvent() {
setTitle("Simple Frame");
setSize(200, 200);
addWindowListener(new CustomWindowAdapter(this));
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new CreateJFrameWindowWithWindowCloseEvent();
//Display the window.
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
class CustomWindowAdapter extends WindowAdapter {
CreateJFrameWindowWithWindowCloseEvent window = null;
CustomWindowAdapter(CreateJFrameWindowWithWindowCloseEvent window) {
this.window = window;
}
// implement windowClosing method
public void windowClosing(WindowEvent e) {
// exit the application when window's close button is clicked
System.exit(0);
}
}
}
This was an example on how to create a JFrame with a window closing event.
