Java Swing Exit Button

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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