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

public class SwingApplication implements ActionListener {
    private static String labelPrefix = "Number of button clicks: ";
    private int numClicks = 0;
    final JLabel label = new JLabel(labelPrefix + "0 ");

    public Component createComponents() {
        JButton button = new JButton("I'm a Swing button!");
        button.setMnemonic(KeyEvent.VK_I);
        button.addActionListener(this);
        label.setLabelFor(button);

        /*
        * An easy way to put space between a top-level container
        * and its contents is to put the contents in a JPanel
        * that has an "empty" border.
        */
        JPanel pane = new JPanel(new GridLayout(0, 1));
        pane.add(button);
        pane.add(label);
        pane.setBorder(BorderFactory.createEmptyBorder(30,30,10,30));
        return pane;
    }

    public void actionPerformed(ActionEvent e) {
        numClicks++;
        label.setText(labelPrefix + numClicks);
    }

    /**
    * Create the GUI and show it. For thread safety,
    * this method should be invoked from the
    * event-dispatching thread.
    */
    private static void createAndShowGUI() {

        //Create and set up the window.
        JFrame frame = new JFrame("SwingApplication");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        SwingApplication app = new SwingApplication();
        Component contents = app.createComponents();
        frame.getContentPane().add(contents, BorderLayout.CENTER);

        //Display the window.
        frame.pack();
        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();
            }
        });
    }
}

вопрос: почему нельзя объявить createComponent как static и не заниматься странными, как мне кажется, объявлениями объектов класса внутри самого класса( в createAndShowGUI )?

извините за косяки с форматированием...