Mortgage Calculator W/ Gui (wk 4)

Filename: MortCalc.java

/*

Version: 1.0 - Initial version

2.0 - Modified the mortgage program from Week 2 to add a list of the loan

balance and interest paid for each payment over the term of the loan

(amortization table). Added loops and pauses for legibility purposes.

2.1 - Broke calculations down into three different methods for assignment

requirements.

3.0 - Modified the mortgage program from version 1.0 to display 3 mortgage

loans. Included all mortgage functionality in one class and created a

separate class that instantiates the first and displays the mortgage

payment amount for each loan. Removed amortization table function.

4.0 - Add a GUI interface and loop and remove the preset loan values.

5.0 - Create buttons for 3 preset loan rates & terms. Also changed interface

to a set size to increase visual appeal and user-friendliness. Added an

amortization table to display loan & interest paid amounts for every payment.

6.0 - Combine the previous two versions: an option to enter custom loan variables

as well as the 3 preset options.

7.0 - Modified the program to read the preset mortgage rates from a file, and

added a chart.

Purpose: Calculate the monthly payment amount for a mortgage loan using a GUI interface.

*/

import java.text.*;

import java.math.*;

import java.io.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class MortCalc

{

public static void main (String[] args)

{

JFrame window = new MortCalcGUI();

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

window.setVisible(true);

}

}

class MortCalcGUI extends JFrame implements ActionListener

{

/*declare GUI function variables*/

protected JButton bCalc7, bCalc15, bCalc30, bCustom, bClear, bExit;

protected JLabel labelPayment, labelLoanAmount, labelTitle, labelInstructions,

labelAmortTable, labelAPR, labelTerm, labelOr, labelThen;

protected JTextField fieldPayment, fieldLoanAmount, fieldTerm, fieldAPR;

protected JTextArea areaAmortTable;

/*Copy the data from the "loanArray" method to an array named "loan" to save recoding time*/

double loan [][] = loanArray();

/*Gather loan information from file*/

public double [] [] loanArray ()

{

/*Initialize array to load data from parsing the file*/

double array[] = new double[6];

try

{

int index = 0;

BufferedReader fileIn = new BufferedReader(new FileReader("Values.txt"));

String temp = null;

Double value = 0.0;

while((temp = fileIn.readLine()) != null)

{

/*convert the string to a double for calculation purposes*/

try

{

value = Double.parseDouble (temp);

}