import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.BorderFactory;
import javax.swing.UIManager;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.GridLayout;

public class frame_c extends JFrame
{

  public frame_c( String titel )
  {
    super( titel );
    
    this.num_lbl = new JLabel( 
      frame_c.num_prefix + "0   " );    

    JButton count_btn = new JButton( 
      "Jag är Swingknapp!" );
    count_btn.setMnemonic( 'J' );
    count_btn.addActionListener(
      new count_btn_listener() ); // ActionListener obj

    JPanel panel = new JPanel();
    panel.setBorder(
      BorderFactory.createEmptyBorder(
        30,     // top
        30,     // left
        10,     // bottom
        30 ) ); // right

    panel.setLayout( new GridLayout(
     0,   // rows, 0 = hur många som helst 
     1)); // cols
    panel.add( count_btn);
    panel.add( this.num_lbl);

    super.getContentPane().add( panel );
    super.pack();

    super.addWindowListener( 
      new window_exit_listener() ); //WindowListener obj
  } // frame_c

  private class count_btn_listener
    implements ActionListener
  {
    public void actionPerformed( ActionEvent aev )
    {
      handle_count_btn();
    }
  } // count_btn_listener

  private class window_exit_listener
    extends WindowAdapter
  {
    public void windowClosing(WindowEvent e) 
    {
      System.exit(0);
    }
  } // window_exit_listener

  private void handle_count_btn()
  {
    this.num_clicks++;
    this.num_lbl.setText(
      this.num_prefix + this.num_clicks );
  } // handle_count_btn


  private static String num_prefix = 
    "Antal klickningar: ";
  private JLabel num_lbl;
  private int num_clicks = 0;


  public static void main(String[] args) 
  {
    try
    {
      if ( args[0].equalsIgnoreCase( "W" ) )
      {
        UIManager.setLookAndFeel(
         UIManager.getSystemLookAndFeelClassName());
      }
      else
      {
        UIManager.setLookAndFeel(
          UIManager.getCrossPlatformLookAndFeelClassName());
      } // if
    } // try 
    catch (Exception e) 
    {
    } // catch
    frame_c frame = new frame_c(
      "SwingApplikation");
    frame.setVisible(true);
  } // main

} // frame_c