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Problem reading a sequential file and creating an array

40 New Member
I am having some trouble configuring my array to read from a sequential file, and then calling on that to fill an array of interests. I think I have the class set up to read the file, but when I run my program the rates array does not get the information. I think my problem is where I am actuall calling the array index, but I am not sure how to do this. Here is my code:

/*
* MortFrame.java
*
* Created on February 24, 2008, 7:28 PM
*/


import java.io.File;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.IOException;

import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;

public class MortFrame extends javax.swing.JFrame {

/** Creates new form MortFrame */
public MortFrame() {
initComponents();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {

jPanel1 = new javax.swing.JPanel();
amountLbl = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
paymentLbl = new javax.swing.JLabel();
display = new javax.swing.JLabel();
amount = new javax.swing.JTextField();
termLbl = new javax.swing.JTextField();
rateLbl = new javax.swing.JTextField();
computePay = new javax.swing.JButton();
clear = new javax.swing.JButton();
exit = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
jScrollPane1 = new javax.swing.JScrollPane();
displayField = new javax.swing.JTextArea();
jPanel3 = new javax.swing.JPanel();
mnuBar = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
mnu7rs = new javax.swing.JMenuItem();
mnu15yrs = new javax.swing.JMenuItem();
mnu30yrs = new javax.swing.JMenuItem();

setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);
setTitle("Mortgage Calculator");

jPanel1.setBorder(javax.swing.BorderFactory.create TitledBorder("Loan Details"));

amountLbl.setFont(new java.awt.Font("Tahoma", 1, 12));
amountLbl.setText("Loan Amount: $");

jLabel2.setFont(new java.awt.Font("Tahoma", 1, 12));
jLabel2.setText("Term:");

jLabel3.setFont(new java.awt.Font("Tahoma", 1, 12));
jLabel3.setText("Rate");

paymentLbl.setFont(new java.awt.Font("Tahoma", 1, 12));
paymentLbl.setText("Monthly Payment: $");

display.setFont(new java.awt.Font("Tahoma", 0, 12));

amount.setFont(new java.awt.Font("Tahoma", 0, 12));

termLbl.setFont(new java.awt.Font("Tahoma", 0, 12));

rateLbl.setFont(new java.awt.Font("Tahoma", 0, 12));

computePay.setText("Calculate");
computePay.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
computePayActionPerformed(evt);
}
});

clear.setText("Clear");
clear.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
clearActionPerformed(evt);
}
});

exit.setText("Exit");
exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
exitActionPerformed(evt);
}
});

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.Grou pLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.LEADING)
.addComponent(amountLbl, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel3, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(paymentLbl, javax.swing.GroupLayout.Alignment.TRAILING))
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.LEADING)
.addComponent(termLbl, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
.addComponent(rateLbl, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
.addComponent(display, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
.addComponent(amount, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(computePay)
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addComponent(clear)
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addComponent(exit, javax.swing.GroupLayout.PREFERRED_SIZE, 66, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);

jPanel1Layout.linkSize(javax.swing.SwingConstants. HORIZONTAL, new java.awt.Component[] {clear, computePay, exit});

jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.Grou pLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.BASELINE)
.addComponent(amountLbl)
.addComponent(amount, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(termLbl, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel3)
.addComponent(rateLbl, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.BASELINE)
.addComponent(paymentLbl)
.addComponent(display))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax. swing.GroupLayout.Alignment.BASELINE)
.addComponent(computePay)
.addComponent(clear)
.addComponent(exit))
.addContainerGap(100, Short.MAX_VALUE))
);

jPanel2.setBorder(javax.swing.BorderFactory.create TitledBorder("Amortization Table\n"));

displayField.setColumns(20);
displayField.setRows(5);
jScrollPane1.setViewportView(displayField);

javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.Grou pLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 375, Short.MAX_VALUE)
.addContainerGap())
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.Grou pLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 226, Short.MAX_VALUE)
.addContainerGap())
);

jPanel3.setBorder(javax.swing.BorderFactory.create TitledBorder("Loan Chart\n"));

javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.Grou pLayout.Alignment.LEADING)
.addGap(0, 680, Short.MAX_VALUE)
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.Grou pLayout.Alignment.LEADING)
.addGap(0, 261, Short.MAX_VALUE)
);

jMenu1.setText("Term");

mnu7rs.setText("7yrs @ 5.35%");
mnu7rs.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mnu7rsActionPerformed(evt);
}
});
jMenu1.add(mnu7rs);

mnu15yrs.setText("15yrs @ 5.50%");
mnu15yrs.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mnu15yrsActionPerformed(evt);
}
});
jMenu1.add(mnu15yrs);

mnu30yrs.setText("30yrs @ 5.75%");
mnu30yrs.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mnu30yrsActionPerformed(evt);
}
});
jMenu1.add(mnu30yrs);

mnuBar.add(jMenu1);

setJMenuBar(mnuBar);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.TRAILING)
.addComponent(jPanel3, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(javax.swing.GroupLayout.Alignment.LEADIN G, layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_S IZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING, false)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);

pack();
}// </editor-fold>//GEN-END:initComponents

private void clearActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_clearActionPerformed
amount.setText("");
display.setText("");
displayField.setText("");
termLbl.setText("");
rateLbl.setText("");
}//GEN-LAST:event_clearActionPerformed

private void exitActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_exitActionPerformed
System.exit(1);
}//GEN-LAST:event_exitActionPerformed

private void computePayActionPerformed(java.awt.event.ActionEve nt evt) {//GEN-FIRST:event_computePayActionPerformed
try {

// calculate the monthly payment
double p=Double.parseDouble(amount.getText());
double r=Double.parseDouble(rateLbl.getText())/1200;
double n=Integer.parseInt(termLbl.getText())*12;
double monthlyPayment=p*Math.pow(1+r,n)*r/(Math.pow(1+r,n)-1);
DecimalFormat df = new DecimalFormat("$###,###.00");
display.setText(df.format(monthlyPayment));
// calculate the detailed loan
double principal=p;
int month;
StringBuffer buffer=new StringBuffer();
buffer.append("Month\tAmount\tInterest\tBalance\n" );
for (int i=0; i<n; i++) {
month=i+1;
double interest=principal*r;
double balance=principal+interest-monthlyPayment;
buffer.append(month+"\t");
buffer.append(new String(df.format(principal))+"\t");
buffer.append(new String(df.format(interest))+"\t");
buffer.append(new String(df.format(balance))+"\n");
principal=balance;
}
displayField.setText(buffer.toString());
} catch(Exception ex) {
System.out.println(ex);
}

}//GEN-LAST:event_computePayActionPerformed

public void getRates(){ // START OF NEW CODE
try{
ArrayList<String> InterestRates = new ArrayList<String>();

BufferedReader inputfile
= new BufferedReader(new FileReader("rates.txt"));
String data;

// debugged by hiwa 1 Jun. 2006
while ((data = inputfile.readLine()) != null){
System.out.println(data);
InterestRates.add(data);
}

rates = new double[InterestRates.size()];
for (int x = 0; x < rates.length; ++x){
rates[x] = Double.parseDouble(InterestRates.get(x));
}

inputfile.close();
}
catch(Exception ec)
{
}
}



private void mnu7rsActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnu7rsActionPerformed
termLbl.setText("" + iTerms[0]);
rateLbl.setText("" + rates[0]);
}//GEN-LAST:event_mnu7rsActionPerformed

private void mnu15yrsActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnu15yrsActionPerformed
termLbl.setText("" + iTerms[1]);
rateLbl.setText("" + rates[x]);
}//GEN-LAST:event_mnu15yrsActionPerformed

private void mnu30yrsActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnu30yrsActionPerformed
termLbl.setText("" + iTerms[2]);
rateLbl.setText("" + rates[x]);
}//GEN-LAST:event_mnu30yrsActionPerformed

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MortFrame().setVisible(true);
}
});
}

// Variables declaration - do not modify//GEN-BEGIN:variables
int iTerms[] = {7, 15, 30};
double[] rates;
int x;
private javax.swing.JTextField amount;
private javax.swing.JLabel amountLbl;
private javax.swing.JButton clear;
private javax.swing.JButton computePay;
private javax.swing.JLabel display;
private javax.swing.JTextArea displayField;
private javax.swing.JButton exit;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JMenu jMenu1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JMenuItem mnu15yrs;
private javax.swing.JMenuItem mnu30yrs;
private javax.swing.JMenuItem mnu7rs;
private javax.swing.JMenuBar mnuBar;
private javax.swing.JLabel paymentLbl;
private javax.swing.JTextField rateLbl;
private javax.swing.JTextField termLbl;
// End of variables declaration//GEN-END:variables

}
Feb 26 '08 #1
1 2901
stevedub
40 New Member
Hmm, for some reason my previous post is not showing up right for me. I'm just reposting just in case something is wrong.

I am having some trouble configuring my array to read from a sequential file, and then calling on that to fill an array of interests. I think I have the class set up to read the file, but when I run my program the rates array does not get the information. I think my problem is where I am actuall calling the array index, but I am not sure how to do this. Here is my code:
Expand|Select|Wrap|Line Numbers
  1. /*
  2.  * MortFrame.java
  3.  *
  4.  * Created on February 24, 2008, 7:28 PM
  5.  */
  6.  
  7.  
  8. import java.io.File;
  9. import java.io.InputStream;
  10. import java.io.FileInputStream;
  11. import java.io.IOException;
  12.  
  13. import java.io.*;
  14. import javax.swing.*;
  15. import javax.swing.event.*;
  16. import java.awt.*;
  17. import java.awt.event.*;
  18. import java.text.*;
  19. import java.util.*;
  20.  
  21. public class MortFrame extends javax.swing.JFrame {
  22.  
  23.     /** Creates new form MortFrame */
  24.     public MortFrame() {
  25.         initComponents();
  26.     }
  27.  
  28.     /** This method is called from within the constructor to
  29.      * initialize the form.
  30.      * WARNING: Do NOT modify this code. The content of this method is
  31.      * always regenerated by the Form Editor.
  32.      */
  33.     // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
  34.     private void initComponents() {
  35.  
  36.         jPanel1 = new javax.swing.JPanel();
  37.         amountLbl = new javax.swing.JLabel();
  38.         jLabel2 = new javax.swing.JLabel();
  39.         jLabel3 = new javax.swing.JLabel();
  40.         paymentLbl = new javax.swing.JLabel();
  41.         display = new javax.swing.JLabel();
  42.         amount = new javax.swing.JTextField();
  43.         termLbl = new javax.swing.JTextField();
  44.         rateLbl = new javax.swing.JTextField();
  45.         computePay = new javax.swing.JButton();
  46.         clear = new javax.swing.JButton();
  47.         exit = new javax.swing.JButton();
  48.         jPanel2 = new javax.swing.JPanel();
  49.         jScrollPane1 = new javax.swing.JScrollPane();
  50.         displayField = new javax.swing.JTextArea();
  51.         jPanel3 = new javax.swing.JPanel();
  52.         mnuBar = new javax.swing.JMenuBar();
  53.         jMenu1 = new javax.swing.JMenu();
  54.         mnu7rs = new javax.swing.JMenuItem();
  55.         mnu15yrs = new javax.swing.JMenuItem();
  56.         mnu30yrs = new javax.swing.JMenuItem();
  57.  
  58.         setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
  59.         setTitle("Mortgage Calculator");
  60.  
  61.         jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("Loan Details"));
  62.  
  63.         amountLbl.setFont(new java.awt.Font("Tahoma", 1, 12));
  64.         amountLbl.setText("Loan Amount: $");
  65.  
  66.         jLabel2.setFont(new java.awt.Font("Tahoma", 1, 12));
  67.         jLabel2.setText("Term:");
  68.  
  69.         jLabel3.setFont(new java.awt.Font("Tahoma", 1, 12));
  70.         jLabel3.setText("Rate");
  71.  
  72.         paymentLbl.setFont(new java.awt.Font("Tahoma", 1, 12));
  73.         paymentLbl.setText("Monthly Payment: $");
  74.  
  75.         display.setFont(new java.awt.Font("Tahoma", 0, 12));
  76.  
  77.         amount.setFont(new java.awt.Font("Tahoma", 0, 12));
  78.  
  79.         termLbl.setFont(new java.awt.Font("Tahoma", 0, 12));
  80.  
  81.         rateLbl.setFont(new java.awt.Font("Tahoma", 0, 12));
  82.  
  83.         computePay.setText("Calculate");
  84.         computePay.addActionListener(new java.awt.event.ActionListener() {
  85.             public void actionPerformed(java.awt.event.ActionEvent evt) {
  86.                 computePayActionPerformed(evt);
  87.             }
  88.         });
  89.  
  90.         clear.setText("Clear");
  91.         clear.addActionListener(new java.awt.event.ActionListener() {
  92.             public void actionPerformed(java.awt.event.ActionEvent evt) {
  93.                 clearActionPerformed(evt);
  94.             }
  95.         });
  96.  
  97.         exit.setText("Exit");
  98.         exit.addActionListener(new java.awt.event.ActionListener() {
  99.             public void actionPerformed(java.awt.event.ActionEvent evt) {
  100.                 exitActionPerformed(evt);
  101.             }
  102.         });
  103.  
  104.         javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
  105.         jPanel1.setLayout(jPanel1Layout);
  106.         jPanel1Layout.setHorizontalGroup(
  107.             jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  108.             .addGroup(jPanel1Layout.createSequentialGroup()
  109.                 .addContainerGap()
  110.                 .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  111.                     .addGroup(jPanel1Layout.createSequentialGroup()
  112.                         .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  113.                             .addComponent(amountLbl, javax.swing.GroupLayout.Alignment.TRAILING)
  114.                             .addComponent(jLabel2, javax.swing.GroupLayout.Alignment.TRAILING)
  115.                             .addComponent(jLabel3, javax.swing.GroupLayout.Alignment.TRAILING)
  116.                             .addComponent(paymentLbl, javax.swing.GroupLayout.Alignment.TRAILING))
  117.                         .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  118.                         .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  119.                             .addComponent(termLbl, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
  120.                             .addComponent(rateLbl, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
  121.                             .addComponent(display, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
  122.                             .addComponent(amount, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)))
  123.                     .addGroup(jPanel1Layout.createSequentialGroup()
  124.                         .addComponent(computePay)
  125.                         .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  126.                         .addComponent(clear)
  127.                         .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  128.                         .addComponent(exit, javax.swing.GroupLayout.PREFERRED_SIZE, 66, javax.swing.GroupLayout.PREFERRED_SIZE)))
  129.                 .addContainerGap())
  130.         );
  131.  
  132.         jPanel1Layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {clear, computePay, exit});
  133.  
  134.         jPanel1Layout.setVerticalGroup(
  135.             jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  136.             .addGroup(jPanel1Layout.createSequentialGroup()
  137.                 .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
  138.                     .addComponent(amountLbl)
  139.                     .addComponent(amount, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
  140.                 .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  141.                 .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
  142.                     .addComponent(jLabel2)
  143.                     .addComponent(termLbl, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
  144.                 .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  145.                 .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
  146.                     .addComponent(jLabel3)
  147.                     .addComponent(rateLbl, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
  148.                 .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  149.                 .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
  150.                     .addComponent(paymentLbl)
  151.                     .addComponent(display))
  152.                 .addGap(18, 18, 18)
  153.                 .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
  154.                     .addComponent(computePay)
  155.                     .addComponent(clear)
  156.                     .addComponent(exit))
  157.                 .addContainerGap(100, Short.MAX_VALUE))
  158.         );
  159.  
  160.         jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder("Amortization Table\n"));
  161.  
  162.         displayField.setColumns(20);
  163.         displayField.setRows(5);
  164.         jScrollPane1.setViewportView(displayField);
  165.  
  166.         javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
  167.         jPanel2.setLayout(jPanel2Layout);
  168.         jPanel2Layout.setHorizontalGroup(
  169.             jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  170.             .addGroup(jPanel2Layout.createSequentialGroup()
  171.                 .addContainerGap()
  172.                 .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 375, Short.MAX_VALUE)
  173.                 .addContainerGap())
  174.         );
  175.         jPanel2Layout.setVerticalGroup(
  176.             jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  177.             .addGroup(jPanel2Layout.createSequentialGroup()
  178.                 .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 226, Short.MAX_VALUE)
  179.                 .addContainerGap())
  180.         );
  181.  
  182.         jPanel3.setBorder(javax.swing.BorderFactory.createTitledBorder("Loan Chart\n"));
  183.  
  184.         javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
  185.         jPanel3.setLayout(jPanel3Layout);
  186.         jPanel3Layout.setHorizontalGroup(
  187.             jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  188.             .addGap(0, 680, Short.MAX_VALUE)
  189.         );
  190.         jPanel3Layout.setVerticalGroup(
  191.             jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  192.             .addGap(0, 261, Short.MAX_VALUE)
  193.         );
  194.  
  195.         jMenu1.setText("Term");
  196.  
  197.         mnu7rs.setText("7yrs @ 5.35%");
  198.         mnu7rs.addActionListener(new java.awt.event.ActionListener() {
  199.             public void actionPerformed(java.awt.event.ActionEvent evt) {
  200.                 mnu7rsActionPerformed(evt);
  201.             }
  202.         });
  203.         jMenu1.add(mnu7rs);
  204.  
  205.         mnu15yrs.setText("15yrs @ 5.50%");
  206.         mnu15yrs.addActionListener(new java.awt.event.ActionListener() {
  207.             public void actionPerformed(java.awt.event.ActionEvent evt) {
  208.                 mnu15yrsActionPerformed(evt);
  209.             }
  210.         });
  211.         jMenu1.add(mnu15yrs);
  212.  
  213.         mnu30yrs.setText("30yrs @ 5.75%");
  214.         mnu30yrs.addActionListener(new java.awt.event.ActionListener() {
  215.             public void actionPerformed(java.awt.event.ActionEvent evt) {
  216.                 mnu30yrsActionPerformed(evt);
  217.             }
  218.         });
  219.         jMenu1.add(mnu30yrs);
  220.  
  221.         mnuBar.add(jMenu1);
  222.  
  223.         setJMenuBar(mnuBar);
  224.  
  225.         javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
  226.         getContentPane().setLayout(layout);
  227.         layout.setHorizontalGroup(
  228.             layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  229.             .addGroup(layout.createSequentialGroup()
  230.                 .addContainerGap()
  231.                 .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
  232.                     .addComponent(jPanel3, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
  233.                     .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
  234.                         .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
  235.                         .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  236.                         .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
  237.                 .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
  238.         );
  239.         layout.setVerticalGroup(
  240.             layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  241.             .addGroup(layout.createSequentialGroup()
  242.                 .addContainerGap()
  243.                 .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
  244.                     .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
  245.                     .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
  246.                 .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  247.                 .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
  248.                 .addContainerGap())
  249.         );
  250.  
  251.         pack();
  252.     }// </editor-fold>//GEN-END:initComponents
  253.  
  254.     private void clearActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_clearActionPerformed
  255.         amount.setText("");
  256.         display.setText("");
  257.         displayField.setText("");
  258.         termLbl.setText("");
  259.         rateLbl.setText("");
  260. }//GEN-LAST:event_clearActionPerformed
  261.  
  262.     private void exitActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_exitActionPerformed
  263.         System.exit(1);
  264. }//GEN-LAST:event_exitActionPerformed
  265.  
  266.     private void computePayActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_computePayActionPerformed
  267.         try {
  268.  
  269.             // calculate the monthly payment
  270.             double p=Double.parseDouble(amount.getText());
  271.             double r=Double.parseDouble(rateLbl.getText())/1200;
  272.             double n=Integer.parseInt(termLbl.getText())*12;
  273.             double monthlyPayment=p*Math.pow(1+r,n)*r/(Math.pow(1+r,n)-1);
  274.             DecimalFormat df = new DecimalFormat("$###,###.00");
  275.             display.setText(df.format(monthlyPayment));
  276.             // calculate the detailed loan
  277.             double principal=p;
  278.             int month;
  279.             StringBuffer buffer=new StringBuffer();
  280.             buffer.append("Month\tAmount\tInterest\tBalance\n");
  281.             for (int i=0; i<n; i++) {
  282.                 month=i+1;
  283.                 double interest=principal*r;
  284.                 double balance=principal+interest-monthlyPayment;
  285.                     buffer.append(month+"\t");
  286.                     buffer.append(new String(df.format(principal))+"\t");
  287.                     buffer.append(new String(df.format(interest))+"\t");
  288.                     buffer.append(new String(df.format(balance))+"\n");
  289.                     principal=balance;
  290.                     }
  291.                     displayField.setText(buffer.toString());
  292.                     } catch(Exception ex) {
  293.                             System.out.println(ex);
  294.                 }
  295.  
  296. }//GEN-LAST:event_computePayActionPerformed
  297.  
  298.     public void getRates(){ // START OF NEW CODE
  299.                     try{
  300.                       ArrayList<String> InterestRates = new ArrayList<String>();
  301.  
  302.                       BufferedReader inputfile
  303.                        = new BufferedReader(new FileReader("rates.txt"));
  304.                       String data;
  305.  
  306.                       // debugged by hiwa 1 Jun. 2006
  307.                       while ((data = inputfile.readLine()) != null){
  308.                         System.out.println(data);
  309.                         InterestRates.add(data);
  310.                       }
  311.  
  312.                       rates = new double[InterestRates.size()];
  313.                       for (int x = 0; x < rates.length; ++x){
  314.                      rates[x] = Double.parseDouble(InterestRates.get(x));
  315.     }
  316.  
  317.         inputfile.close();
  318.     }
  319.         catch(Exception ec)
  320.     {
  321.     }
  322. }
  323.  
  324.  
  325.  
  326.     private void mnu7rsActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnu7rsActionPerformed
  327.         termLbl.setText("" + iTerms[0]);
  328.         rateLbl.setText("" + rates[0]);
  329. }//GEN-LAST:event_mnu7rsActionPerformed
  330.  
  331.     private void mnu15yrsActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnu15yrsActionPerformed
  332.         termLbl.setText("" + iTerms[1]);
  333.         rateLbl.setText("" + rates[x]);
  334. }//GEN-LAST:event_mnu15yrsActionPerformed
  335.  
  336.     private void mnu30yrsActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnu30yrsActionPerformed
  337.         termLbl.setText("" + iTerms[2]);
  338.         rateLbl.setText("" + rates[x]);
  339. }//GEN-LAST:event_mnu30yrsActionPerformed
  340.  
  341.     /**
  342.      * @param args the command line arguments
  343.      */
  344.     public static void main(String args[]) {
  345.         java.awt.EventQueue.invokeLater(new Runnable() {
  346.             public void run() {
  347.                 new MortFrame().setVisible(true);
  348.             }
  349.         });
  350.     }
  351.  
  352.     // Variables declaration - do not modify//GEN-BEGIN:variables
  353.     int iTerms[] = {7, 15, 30};
  354.     double[] rates;
  355.     int x;
  356.     private javax.swing.JTextField amount;
  357.     private javax.swing.JLabel amountLbl;
  358.     private javax.swing.JButton clear;
  359.     private javax.swing.JButton computePay;
  360.     private javax.swing.JLabel display;
  361.     private javax.swing.JTextArea displayField;
  362.     private javax.swing.JButton exit;
  363.     private javax.swing.JLabel jLabel2;
  364.     private javax.swing.JLabel jLabel3;
  365.     private javax.swing.JMenu jMenu1;
  366.     private javax.swing.JPanel jPanel1;
  367.     private javax.swing.JPanel jPanel2;
  368.     private javax.swing.JPanel jPanel3;
  369.     private javax.swing.JScrollPane jScrollPane1;
  370.     private javax.swing.JMenuItem mnu15yrs;
  371.     private javax.swing.JMenuItem mnu30yrs;
  372.     private javax.swing.JMenuItem mnu7rs;
  373.     private javax.swing.JMenuBar mnuBar;
  374.     private javax.swing.JLabel paymentLbl;
  375.     private javax.swing.JTextField rateLbl;
  376.     private javax.swing.JTextField termLbl;
  377.     // End of variables declaration//GEN-END:variables
  378.  
  379. }
  380.  
Feb 26 '08 #2

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