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 = new JComboBox();

//setup row 3

JPanel row3 = new JPanel();

JLabel fileText = new JLabel("Enter file name and location to read from:", JLabel.RIGHT);

JTextField textFile = new JTextField("", 12);

//setup row 4

JPanel row4 = new JPanel();

JLabel monthlyPayment = new JLabel("Monthly Payment:", JLabel.RIGHT);

JTextField mthPay = new JTextField(9);

//setup row 5

JPanel row5 = new JPanel();

JButton Calculate = new JButton("Calculate");

JButton Reset = new JButton("Reset");

JButton Quit = new JButton("Quit");

//setup row 6

JPanel row6 = new JPanel();

JTextArea mortg = new JTextArea(5, 40);

JLabel header = new JLabel("Payment# Principle Balance Interest n",JLabel.LEFT);

JScrollPane scroll = new JScrollPane(mortg, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,

JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

public MortgageGUI() { //creating layout for the GUI

super("Mortgage Calculator");

setSize (500, 720);

setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

Container pane = getContentPane();

GridLayout layout = new GridLayout(7, 1, 1, 1);

pane.setLayout(layout);

setVisible(true);

Calculate.addActionListener(this);

Reset.addActionListener(this);

Quit.addActionListener(this);

princ.addActionListener(this);

combo.addActionListener(this);

textFile.addActionListener(this);

FlowLayout layout0 = new FlowLayout(FlowLayout.CENTER, 2, 2);

row.setLayout(layout0);