Re: calculation issues

Update: I have this working but the calculations are wrong. Where is my
mistake?

import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Cbweek1b {

 double a, t, i, payments;
 JLabel amountLbl, termLbl, IntrateLbl, paymentsLbl;
 JTextField amountTf, termTf, intrateTf, paymentsTf;
 JButton calcBtn;
 JFrame frame;
 Font font;

 public Cbweek1b() {
  System.out.println("Starting Mortgage Calculator GUI.");

  font = new Font("Arial",Font.BOLD,24);

  amountLbl = new JLabel("Loan Amount");
  termLbl = new JLabel("Terms");
  IntrateLbl = new JLabel("Interest Rate");
  paymentsLbl = new JLabel("Monthly amount");

  amountTf = new JTextField();
  termTf = new JTextField();
  intrateTf = new JTextField();
  paymentsTf = new JTextField();

  calcBtn = new JButton("Calculate");

  amountLbl.setFont(font);
  termLbl.setFont(font);
  IntrateLbl.setFont(font);
  paymentsLbl.setFont(font);
  amountTf.setFont(font);
  termTf.setFont(font);
  intrateTf.setFont(font);
  paymentsTf.setFont(font);
  calcBtn.setFont(font);

  frame = new JFrame("Mortgage Calculator");
  frame.setLayout(new GridLayout(6,6));
  frame.add(amountLbl);
  frame.add(amountTf);
  frame.add(termLbl);
  frame.add(termTf);
  frame.add(IntrateLbl);
  frame.add(intrateTf);
  frame.add(paymentsLbl);
  frame.add(paymentsTf);
  frame.add(calcBtn);

  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  calcBtn.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    calculate();
   }
  });

  frame.setLocation(300, 200);
  // frame.setSize(300, 300);
  frame.pack();
  frame.setVisible(true);

 }

 public static void main(String[] args) {
  new Cbweek1b();
 }

 private void calculate() {
  double a = Double.parseDouble(amountTf.getText());
  double t = Double.parseDouble(termTf.getText());
  double i = Double.parseDouble(intrateTf.getText());
  double payments = a * i/ (1.0 - Math.pow(i+1,-t));
  paymentsTf.setText("" + payments);
 }
}

--

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