Here you will see how to handle the window closing event of a JFrame. What you need to do is implement a java.awt.event.WindowListener interface and call the frame addWindowListener() method to add the listener to the frame instance. To handle the closing event implements the windowClosing() method of the interface.

But, instead of implementing the java.awt.event.WindowListener interface which require us to implement the entire methods defined in the interface, we can create a an instance of WindowAdapter object and override only the method we need, which is the windowsClosing() method. Let’s see the code snippet below.

package org.kodejava.example.swing;

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

public class WindowClosingDemo extends JFrame {
    public static void main(String[] args) {
        WindowClosingDemo frame = new WindowClosingDemo();
        frame.setSize(new Dimension(250, 250));
        frame.add(new Button("Hello World"));

        // Add window listener by implementing WindowAdapter class to
        // the frame instance. To handle the close event we just need
        // to implement the windowClosing() method.
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("WindowClosingDemo.windowClosing");
                System.exit(0);
            }
        });

        // Show the frame
        frame.setVisible(true);
    }
}

• About
• Latest Posts

Wayan Saryada

Founder at Kode Java Org

I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. You can support my works by donating here. Thank you 🥳

Latest posts by Wayan Saryada (see all)

• How do I define access modifiers in Lombok’s @Getter and @Setter annotations? - December 21, 2018
• How do I generate getters and setters with Lombok? - December 21, 2018
• How do I write JSON string using JSON-Java (org.json) library? - August 31, 2018