calculation issues

From:

"pcbutts1" <pcbutts1@seedsv.com>

Newsgroups:

comp.lang.java.help,comp.lang.java,alt.comp.lang.java

Date:

Sat, 1 Jul 2006 17:13:56 -0700

Message-ID:

<4dudnZoWAPpYkjrZnZ2dnUVZ_sOdnZ2d@giganews.com>

This is a simple mortgage calculator and it compiles but I am totally
confused on the calculation to get it to work. Can someone help me a little.

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 * t;
  paymentsTf.setText("" + payments);
}
}

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