Mortgage Calculator Help

[vwrado]

Hi I am taking a programming class and it requires me to write a java program to calculate mortgage with a GUI.
Here is what I have so far. Where did I go wrong?

Thanks in advance!

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

public class Calculator extends JFrame implements ActionListener {
private JPanel panelAdder;
private JLabel labela;
private JLabel labelt;
private JLabel labelr;
private JTextField textFieldAmount;
private JTextField textFieldTerm;
private JTextField textFieldRate;
private JTextField textFieldResult;
private JButton buttonCalc;

public Calculator() {
  initComponents();
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setVisible(true);
  pack();

  // Add Listeners
  buttonCalc.addActionListener(this);
}

public void initComponents() {
 //Initialize Components
 panelAdder = new JPanel();
 labela = new JLabel("Amount");
 textFieldAmount = new JTextField();
 labelt = new JLabel("Term");
 textFieldTerm = new JTextField();
 labelr = new JLabel("Rate");
 textFieldRate = new JTextField();
 textFieldResult = new JTextField();
 buttonCalc = new JButton("Calculate");

 //Set Object Attributes
 textFieldResult.setEditable(false);
 textFieldResult.setColumns(8);
 textFieldAmount.setColumns(6);
 textFieldTerm.setColumns(2);
 textFieldRate.setColumns(2);

 Container contentPane = getContentPane();
 contentPane.setLayout(new FlowLayout());

 //Lets add the components to the panel
 panelAdder.add(labela);
 panelAdder.add(textFieldAmount);
 panelAdder.add(labelt);
 panelAdder.add(textFieldTerm);
 panelAdder.add(labelr);
 panelAdder.add(textFieldRate);
 panelAdder.add(buttonCalc);
 panelAdder.add(textFieldResult);

 contentPane.add(panelAdder);
}

public static void main(String[] args) {
  Calculator frame = new Calculator();
}

private void setResultValue() {
   double amount = Integer.parseInt(textFieldAmount.getText());
   double term = Integer.parseInt(textFieldTerm.getText());
   double rate = Integer.parseInt(textFieldRate.getText()) / 100.;
   double result = amount * ( rate * Math.pow ( ( 1 + rate ), term ) ) / ( Math.pow( ( 1 + rate ), term ) - 1 );

   textFieldResult.setText(Double.toString(result));
}

public void actionPerformed(ActionEvent event) {
  System.out.println("Action Button");
  String command = event.getActionCommand();
  if (command == "Calculate") {
      setResultValue();
  }
}
}