O que há de errado com este código

Sou iniciante em Java e estou tentando fazer algumas coisas baixei um exemplo que mostrava uma tela de Swing e estou tentando acrescentar augo de outro exemplo dentro dele.

    Ocorre que quando coloco o bloco que está comnetado no programa

//String url = "jdbc:postgresql://10.0.1.53:5432/agenda"; 
String url = "jdbc:postgresql://localhost:5432/agenda"; 
//String url = "jdbc:postgresql:agenda";    //Assim também funciona, pois pega os defaults 
Connection con; 
String query = "select * from amigos"; 
Statement stmt; 
//*********************************************************    //**********************************************************    //*********************************************************

//O ERRO OCORRE QUANDO EU COLOCO ESTE BLOCO NO PROGRAMA

//**********************************************************   //**********************************************************

try

{

Class.forName(“org.postgresql.Driver”);

}

catch(java.lang.ClassNotFoundException e)

{

System.err.print("ClassNotFoundException: ");

System.err.println(e.getMessage());

}

//*********************************************************    //**********************************************************    //*********************************************************    //**********************************************************    //*********************************************************    //**********************************************************   private static String labelPrefix = "Numero de Acionamentos: ";
private int numClicks = 0;
final JLabel label = new JLabel(labelPrefix + "0    ");

//Specify the look and feel to use.  Valid values:
//null (use the default), "Metal", "System", "Motif", "GTK+"
final static String LOOKANDFEEL = null;

public Component createComponents() {
    JButton button = new JButton("Isto é um Botão do Swing");
    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, //top
                                    30, //left
                                    10, //bottom
                                    30) //right
                                    );

    return pane;
}

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

private static void initLookAndFeel() {
    String lookAndFeel = null;

    if (LOOKANDFEEL != null) {
        if (LOOKANDFEEL.equals("Metal")) {
            lookAndFeel = UIManager.getCrossPlatformLookAndFeelClassName();
        } else if (LOOKANDFEEL.equals("System")) {
            lookAndFeel = UIManager.getSystemLookAndFeelClassName();
        } else if (LOOKANDFEEL.equals("Motif")) {
            lookAndFeel = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
        } else if (LOOKANDFEEL.equals("GTK+")) { //new in 1.4.2
            lookAndFeel = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
        } else {
            System.err.println("Unexpected value of LOOKANDFEEL specified: "
                               + LOOKANDFEEL);
            lookAndFeel = UIManager.getCrossPlatformLookAndFeelClassName();
        }

        try {
            UIManager.setLookAndFeel(lookAndFeel);
        } catch (ClassNotFoundException e) {
            System.err.println("Couldn't find class for specified look and feel:"
                               + lookAndFeel);
            System.err.println("Did you include the L&F library in the class path?");
            System.err.println("Using the default look and feel.");
        } catch (UnsupportedLookAndFeelException e) {
            System.err.println("Can't use the specified look and feel ("
                               + lookAndFeel
                               + ") on this platform.");
            System.err.println("Using the default look and feel.");
        } catch (Exception e) {
            System.err.println("Couldn't get specified look and feel ("
                               + lookAndFeel
                               + "), for some reason.");
            System.err.println("Using the default look and feel.");
            e.printStackTrace();
        }
    }
}

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

    //Make sure we have nice window decorations.
    JFrame.setDefaultLookAndFeelDecorated(true);

    //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();
        }
    });
}