Help!!!

[Hunterkiller5150]

Help!!
I am new to Java and having a really hard time understanding it! I have to make a swing based heart rate calculator and I am having all sorts of problems with it. Here is the code.

public class hrcalc extends Frame implements ActionListener
{
double maxHeartRate = 0.0;
double age = 0;
JTextField myTextField = new JTextField();



private static void cFrame()
{
public hrcalc ()
{
//Create and set up the window.
JFrame frame = new JFrame("Heart Rate Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);

JLabel emptyLabel = new JLabel("Please enter your age.");
emptyLabel.setPreferredSize(new Dimension(300, 200));
frame.getContentPane().add(emptyLabel, BorderLayout.NORTH);
frame.getContentPane().add(myTextField, BorderLayout.CENTER);

//Display the window.
frame.pack();
frame.setVisible(true);

//JTextField myTextField = new JTextField(16);
}
}

public void actionPerformed(ActionEvent e)
{

}

public static void main(String[] args)
{

javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
cFrame();
//JTextField text = new JTextField(16);
//content.add(yourInputField);
/*p.add(text);
String x = text.getText();

string agestring = tField.setText();

if (agestring == null || agestring.length() == 0)
{
JOptionPane
return;
}
double age = double.parseDouble(agestring);
hr = aset
label1.setText("Your heart rate is " + hr)
*/

}
});
}

}

[faisalcmpm]

Please remove commented lines.
Also would you please tell u whats the real issue