JFrame

Create JFrame window with window close event

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 windowClosing method. Now every time the window closes, this method will fire up.

Let’s take a look at the code snippets that follow:

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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.

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Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.
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