import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SwingApplication{
    private static String labelPrefix="Number of buton 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.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                numClicks++;
                label.setText(labelPrefix+numClicks);
                }
            });
        JPanel pane=new JPanel();
        pane.setBorder(BorderFactory.createEmptyBorder(
                                    30,
                                    30,
                                    10,
                                    30)
                                    );
        pane.setLayout(new GridLayout(0,1));
        pane.add(button);
        pane.add(label);
        return pane;
        }
public static void main(String args[]){
    try{
        UIManager.setLookAndFeel(
            UIManager.getCrossPlatformLookAndFeelClassName());
        }catch (Exception e){}
    JFrame frame=new JFrame("SwingApplication");
    SwingApplication app=new SwingApplication();
    Component contents=app.createComponents();
    frame.getContentPane().add(contents,BorderLayout.CENTER);
    frame.addWindowListener(new WindowAdapter(){
        public void windowClosing(WindowEvent e){
            System.exit(0);
            }
        });
        frame.pack();
        frame.setVisible(true);
    }
    }