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I am attempting to graph my amortization results and I am a little lost on how to accomplish this. any help is appreciated.
//Imports packages
import java.awt.*; //Used create to buttons
import java.awt.event.*; //Used create an event
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.text.DecimalFormat; //Used to import decimal format for money
//Action listener
public class MortgageCalculator extends JPanel implements ActionListener, ItemListener
{
//Variables
protected JComboBox MortIntRate;
protected JLabel lblprincipal, lblinterestRate, lblTerm, lblmonthlyPayment;
protected JButton calculate, Reset, exit;//New button exit
protected JTextField principal, interestRate, Term, monthlyPayment, mortgagecalculater;
protected TextArea MortPayResults;
protected Hashtable ht = null;
public MortgageCalculator()
{
//String[] comboItems = {"5.35", "5.50", "5.75", "Custom"};//Interest rates used in program creating a combo box
ht = new Hashtable();
try
{
RandomAccessFile bis = new RandomAccessFile(new File("c:\\rates.txt"), "r");
for(String str = bis.readLine(); str != null; str = bis.readLine())
{
String[] strArr = str.split(":");
ht.put(strArr[0], strArr[1]);
}
}catch(Exception ex)
{
System.out.println("Not able to read Rates.txt file" );
return;
}
String[] comboItems = new String[ht.size()];
Enumeration en = ht.keys();
for(int i = 0; en.hasMoreElements(); i++)
{
comboItems[i] = (String) en.nextElement();
}
//Label are defined here,used to creates labels and fields
lblprincipal = new JLabel("Principal Amount:");
principal = new JTextField("", 4);
lblinterestRate = new JLabel("Interest Rate:");
interestRate = new JTextField("", 3);
interestRate.setEditable(false);
lblTerm = new JLabel("Term:");
Term = new JTextField("", 3);
Term.setEditable(false);
lblmonthlyPayment = new JLabel("Monthly Payment:");
monthlyPayment = new JTextField("", 5);
MortIntRate = new JComboBox(comboItems);
MortIntRate.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
setTermValue();
}
} );
mortIntPrevSel = (String) MortIntRate.getSelectedItem();
interestRate.setText((String) MortIntRate.getSelectedItem());
MortIntRate.addItemListener(this);
MortPayResults = new TextArea(20, 65);
//Create action buttons
calculate = new JButton("Calculate"); //Create button used to calculate mortgage payment
calculate.setActionCommand("GO");
Reset = new JButton("Reset"); //Create button used to reset data from the fields
Reset.setActionCommand("Reset");
exit = new JButton("Exit");//new
exit.setActionCommand("Exit");//new
//Activate buttons
calculate.addActionListener(this);
Reset.addActionListener(this);
exit.addActionListener(this);//new
//Add labels and fields
add(lblprincipal);
add(principal);
add(lblinterestRate);
add(interestRate);
add(MortIntRate);
add(lblTerm);
add(Term);
add(lblmonthlyPayment);
add(monthlyPayment);
add(MortPayResults);
add(calculate);
add(Reset);
add(exit);//new
}
public void actionPerformed(ActionEvent e)// Action event occurs here
{
if ("GO".equals(e.getActionCommand()))
{
CalculateMortgage();
}
else
{
principal.setText("");
interestRate.setText("");
Term.setText("");
monthlyPayment.setText("");
MortPayResults.setText("");
}
}
public void setTermValue()
{
String termValue = (String) ht.get((String)interestRate.getText());
Term.setText(termValue);
}
public void CalculateMortgage()
{
// interestRate.setText("" + (String) MortIntRate.getSelectedItem());
double dblprincipal = Double.parseDouble(principal.getText());
double dblInterestRate = Double.parseDouble(interestRate.getText());
//Handle the condition.
/*if (dblInterestRate == 5.35)
Term.setText("7");
else if (dblInterestRate == 5.50)
Term.setText("15");
else if (dblInterestRate == 5.75)
Term.setText("30");*/
//Currency is set here
int intTerm = Integer.parseInt(Term.getText());
DecimalFormat money = new DecimalFormat("$0.00");
double MonthlyPayment;
double InterestPaid;
double PrincipalBal;
double temp;
int Months;
double MIntRate = dblInterestRate / 100;
int MTerms = intTerm * 12;
Months = MTerms;
//Formulas
MonthlyPayment = (dblprincipal * (MIntRate / 12)) / (1 - 1 / Math.pow((1 + MIntRate / 12), MTerms));
//Converts Monthly Payment to decimal format
monthlyPayment.setText("" + (money.format(MonthlyPayment)));
MortPayResults.append("Month No.\tMonthly Payment\t\tLoan Balance\t\tInterest Payment\n");
for (int counter = 0; counter < MTerms; counter++)
{
temp = (1 - 1 / Math.pow((1 + MIntRate / 12), Months));
InterestPaid = MonthlyPayment * temp;
dblprincipal = (dblprincipal - MonthlyPayment + InterestPaid);
MTerms = MTerms--;
Months--;
MortPayResults.append((counter + 1) + "\t\t" + (money.format(MonthlyPayment) + "\t\t" + (money.format(dblprincipal) + "\t\t" + (money.format(InterestPaid) + "\n"))));
MortPayResults.setCaretPosition(0);
}
}
//GUI is created in this section
private static void createAndShowGui()
{
JFrame frame = new JFrame("Multiple Mortgage Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Frame is setup
MortgageCalculator myCalculator = new MortgageCalculator();
myCalculator.setOpaque(true);
frame.setContentPane(myCalculator);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args)
{
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGui();
}
}
);
}
//Get interest rates here
public void itemStateChanged(ItemEvent e)
{
if(e.getSource() instanceof JComboBox)
{
JComboBox cb = (JComboBox) e.getSource();
String str = (String) cb.getSelectedItem();
if(str.equals("Custom"))
{
interestRate.setEditable(true);
interestRate.setText("");
}
else
{
interestRate.setEditable(false);
interestRate.setText(str);
}
}
}
private String mortIntPrevSel;
}
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