Swing Application, an Overview

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

public class SwingApplication {
    private static String labelPrefix = 
        "Number of button clicks: ";
    private int numClicks = 0;

    public Component createComponents() {
        final JLabel label = 
            new JLabel(labelPrefix + "0    ");
        JButton button = new 
            JButton("I'm a Swing button!");
        button.setMnemonic(KeyEvent.VK_I);
        button.setToolTipText("Tips!");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                numClicks++;
                label.setText(labelPrefix + numClicks);
            }
        });
        JPanel pane = new JPanel();
        pane.setBorder(
            BorderFactory.createTitledBorder("Components"));
        pane.setLayout(new GridLayout(0, 1));
        pane.setBackground(new Color(0xffA0A0));
        pane.add(button);
        pane.add(label);
        return pane;
    }

    public static void main(String[] args) {
        //Create the top-level container and add contents to it.
        JFrame frame = new JFrame("SwingApplication");
        SwingApplication app = new SwingApplication();
        Component contents = app.createComponents();
        frame.getContentPane().add(contents, BorderLayout.CENTER);

        frame.setDefaultCloseOperation(
            JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}