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Gui Mortgage Calculator

GUI Mortgage Calculator
University of Phoenix
David Silberberg
POS 407
04-19-2005


Program

/*
* MortgageGui.java
* Version 4
* Created on April 19, 2005
* Use a graphical interface to allow a user to input a principle amount, interest rate
* and term of loan then calculate loan payment.
* Added text field to show amortization of loan. Also checked for last payment equal to
* less than monthly payment. Added in the ability to select a predefined interest rate
* and term. Added in the ability to read in from a file (file is found in C:\mortgagein.txt).
*
*
* @author ************
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.io.*;

public class MortgageGUI extends JFrame implements ActionListener {
double total = 0; //monthly payment initalization of variables
double i = 0; //interest
double p = 0; //principle
int t = 0; //term in years
int m = 0; //monthly term
double j = 0; //daily interest rate
double mPayment = 0;
double monthlyInterest = 0;
double principleOnly = 0;
double newBalance = 0;
int choice = 0;

//setup row
JPanel row = new JPanel();
JLabel heading = new JLabel("Mortgage Calculator", JLabel.CENTER);
//setup row 1
JPanel row1 = new JPanel();
JLabel principle = new JLabel("Amount to Borrow:", JLabel.RIGHT);
JTextField princ = new JTextField("100000", 6);
JLabel term = new JLabel(" Years:", JLabel.RIGHT);
JTextField years = new JTextField("", 3);
JLabel rate = new JLabel(" Interest Rate:", JLabel.RIGHT);
JTextField irate = new JTextField("", 4);
//setup row 2
JPanel row2 = new JPanel();
JLabel termInt = new JLabel("Select the Term and interest rate:", JLabel.LEFT);
String[] formats = {"Choose from below or enter your own","7 years @ 5.35%", "15 years @ 5.5%", "30 years @ 5.75%","Enter a file in line below"};
JComboBox combo...