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In this post, I show you how to exit a Swing application when clicking on the exit button.

Java Swing Exit Button Code

In this example, we will have a button. When we click on the button, the application terminates.

package net.sourcecodeexamples.swingexamples.firstprograms;

import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;

import java.awt.Container;
import java.awt.EventQueue;

/**
 * Class to demonstrates When we click on the button, the application terminates.
 * @author javaguides.net
 *
 */
public class QuitButtonExample extends JFrame {

 private static final long serialVersionUID = 1L;

    private void initializeUI() {

     JButton quitButton = new JButton("Quit");

        quitButton.addActionListener((event) -> System.exit(0));

        createLayout(quitButton);

        setTitle("Quit button");
        setSize(300, 200);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    private void createLayout(JComponent... arg) {

        Container pane = getContentPane();
        GroupLayout gl = new GroupLayout(pane);
        pane.setLayout(gl);

        gl.setAutoCreateContainerGaps(true);

        gl.setHorizontalGroup(gl.createSequentialGroup()
                .addComponent(arg[0])
        );

        gl.setVerticalGroup(gl.createSequentialGroup()
                .addComponent(arg[0])
        );
    }

    public static void main(String[] args) {

        EventQueue.invokeLater(() -> {
         QuitButtonExample quitButtonExample = new QuitButtonExample();
         quitButtonExample.initializeUI();
         quitButtonExample.setVisible(true);
        });
    }
}

We position a JButton on the window and add an action listener to this button.

Here we create a button component. This constructor takes a string label as a parameter:

JButton quitButton = new JButton("Quit");

We plug an action listener to the button. The action terminates the application by calling the System.exit() method:

quitButton.addActionListener((event) -> System.exit(0));

The child components need to be placed into containers. We delegate the task to the createLayout() method:

createLayout(quitButton);

Output

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