Thread: Please Help!!!

I am having trouble with my code. It is an ammortization calculator and it works fine except that the first time I click on the calculate button I get these funky little boxes instead of my interest, payment, and balance numbers. If I click it again, it works fine. Please help! My code is:

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

/**
*
* @author Warbird
*/
import javax.swing.*;
import java.awt.*;
import java.text.*;
import java.awt.event.*;
import java.lang.String.*;
import java.text.NumberFormat;
import java.text.DecimalFormat;
public class WeekThreeCalc extends javax.swing.JFrame {


double amount = 0;
double[] iRate = {.0535, .055, .0575};
double iRate1 = iRate [2];
double[] years = {7, 15, 30};
double interest = 0.0;
double term = years [2];
double mpay;
double rate;
double tMonths = 0.0;
double mPayment1;
double balance = 0;
double mRatePaid = 0.00;
double mPrinciple = 0.00;
int months = 0;
double mRate = 0;
DecimalFormat ePay = new DecimalFormat ("$###,##0.00");;
NumberFormat currency =
NumberFormat.getCurrencyInstance();

public WeekThreeCalc() {
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.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

lAmountLabel = new javax.swing.JLabel();
termIntLabel = new javax.swing.JLabel();
mPaymentLabel = new javax.swing.JLabel();
termInt = new javax.swing.JComboBox();
lAmount = new javax.swing.JTextField();
mPayment = new javax.swing.JTextField();
results = new java.awt.ScrollPane();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
exitButton = new javax.swing.JButton();
calcButton = new javax.swing.JButton();
clearButton = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);

lAmountLabel.setText("Loan Amount");

termIntLabel.setText("Term/Interest");

mPaymentLabel.setText("Monthly Payment");

termInt.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Select Loan Term and Interest", "7 years at 5.35%", "15 years at 5.5%", "30 years at 5.75%" }));

mPayment.setEditable(false);

jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);

results.add(jScrollPane1);

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

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

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

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(22, 22, 22)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
.addComponent(lAmountLabel)
.addComponent(lAmount, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(69, 69, 69)
.addComponent(termIntLabel))
.addGroup(layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(termInt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(40, 40, 40)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
.addComponent(mPayment, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(mPaymentLabel)))
.addGroup(layout.createSequentialGroup()
.addGap(48, 48, 48)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(exitButton)
.addGap(54, 54, 54)
.addComponent(calcButton)
.addGap(87, 87, 87)
.addComponent(clearButton))
.addComponent(results, 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()
.addGap(24, 24, 24)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
.addComponent(lAmountLabel)
.addComponent(termIntLabel)
.addComponent(mPaymentLabel))
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
.addComponent(termInt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lAmount, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(mPayment, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(124, 124, 124)
.addComponent(results, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED, 165, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
.addComponent(clearButton)
.addComponent(calcButton)
.addComponent(exitButton))
.addContainerGap())
);

pack();
}// </editor-fold>

private void exitButtonActionPerformed(java.awt.event.ActionEve nt evt) {
System.exit(0);
}

private void clearButtonActionPerformed(java.awt.event.ActionEv ent evt) {
lAmount.setText("");
mPayment.setText("");
jTextArea1.setText("");
}

private void calcButtonActionPerformed(java.awt.event.ActionEve nt evt) {
Integer termInt1;
termInt1 = termInt.getSelectedIndex();
if (termInt1 == 0)
{

}
if (termInt1 == 1)
{
interest = iRate [0];
term = years [0];
}
if (termInt1 == 2)
{
interest = iRate [1];
term = years [1];
}
if (termInt1 == 3)
{
interest = iRate [2];
term = years [2];
}
double monthRate = iRate1 /12;

mPayment1 = amount *(monthRate / (1-Math.pow(1 + monthRate, -tMonths)));
amount = Double.parseDouble(lAmount.getText());
mPayment.setText(currency.format(mPayment1) + " ");
repaint();
tMonths = term * 12;
balance = amount;


for (months = 1; months <= tMonths; months++)
{
mRate = iRate1 /12;
mRatePaid = balance * mRate;
mPrinciple = mPayment1 - mRatePaid;
balance = balance - mPrinciple;
jTextArea1.append(" "+ months + "\t\t " + ePay.format(mPayment1) +"\t\t" + ePay.format(mRatePaid) + "\t\t" + ePay.format (balance) + "\n");
}
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* How to Set the Look and Feel (The Java™ Tutorials > Creating a GUI With JFC/Swing > Modifying the Look and Feel)
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClass Name());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
}
//</editor-fold>

/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {
new WeekThreeCalc().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton calcButton;
private javax.swing.JButton clearButton;
private javax.swing.JButton exitButton;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextField lAmount;
private javax.swing.JLabel lAmountLabel;
private javax.swing.JTextField mPayment;
private javax.swing.JLabel mPaymentLabel;
private java.awt.ScrollPane results;
private javax.swing.JComboBox termInt;
private javax.swing.JLabel termIntLabel;
// End of variables declaration
}

Sorry about that. I did not read the formatting rules on the page. Hope this helps.

 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author Warbird
 */
 import javax.swing.*;
 import java.awt.*;
 import java.text.*;
 import java.awt.event.*;
 import java.lang.String.*;
 import java.text.NumberFormat;
 import java.text.DecimalFormat;
 public class WeekThreeCalc extends javax.swing.JFrame {
 
 
double amount = 0;
 double[] iRate = {.0535, .055, .0575};
 double iRate1 = iRate [2];
 double[] years = {7, 15, 30};
 double interest = 0.0;
 double term = years [2];
 double mpay;
 double rate;
 double tMonths = 0.0;
 double mPayment1;
 double balance = 0;
 double mRatePaid = 0.00;
 double mPrinciple = 0.00;
 int months = 0;
 double mRate = 0;
 DecimalFormat ePay = new DecimalFormat ("$###,##0.00");;
 NumberFormat currency = 
NumberFormat.getCurrencyInstance();
 
 public WeekThreeCalc() {
 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.
 */
 @SuppressWarnings("unchecked")
 // <editor-fold defaultstate="collapsed" desc="Generated Code">
 private void initComponents() {
 
lAmountLabel = new javax.swing.JLabel();
 termIntLabel = new javax.swing.JLabel();
 mPaymentLabel = new javax.swing.JLabel();
 termInt = new javax.swing.JComboBox();
 lAmount = new javax.swing.JTextField();
 mPayment = new javax.swing.JTextField();
 results = new java.awt.ScrollPane();
 jScrollPane1 = new javax.swing.JScrollPane();
 jTextArea1 = new javax.swing.JTextArea();
 exitButton = new javax.swing.JButton();
 calcButton = new javax.swing.JButton();
 clearButton = new javax.swing.JButton();
 
setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);
 
lAmountLabel.setText("Loan Amount");
 
termIntLabel.setText("Term/Interest");
 
mPaymentLabel.setText("Monthly Payment");
 
termInt.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Select Loan Term and Interest", "7 years at 5.35%", "15 years at 5.5%", "30 years at 5.75%" }));
 
mPayment.setEditable(false);
 
jTextArea1.setColumns(20);
 jTextArea1.setRows(5);
 jScrollPane1.setViewportView(jTextArea1);
 
results.add(jScrollPane1);
 
exitButton.setText("Exit");
 exitButton.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(java.awt.event.ActionEvent evt) {
 exitButtonActionPerformed(evt);
 }
 });
 
calcButton.setText("Calculate!");
 calcButton.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(java.awt.event.ActionEvent evt) {
 calcButtonActionPerformed(evt);
 }
 });
 
clearButton.setText("Clear");
 clearButton.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(java.awt.event.ActionEvent evt) {
 clearButtonActionPerformed(evt);
 }
 });
 
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
 getContentPane().setLayout(layout);
 layout.setHorizontalGroup(
 layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
 .addGroup(layout.createSequentialGroup()
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
 .addGroup(layout.createSequentialGroup()
 .addGap(22, 22, 22)
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
 .addComponent(lAmountLabel)
 .addComponent(lAmount, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE))
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
 .addGroup(layout.createSequentialGroup()
 .addGap(69, 69, 69)
 .addComponent(termIntLabel))
 .addGroup(layout.createSequentialGroup()
 .addGap(18, 18, 18)
 .addComponent(termInt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
 .addGap(40, 40, 40)
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
 .addComponent(mPayment, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
 .addComponent(mPaymentLabel)))
 .addGroup(layout.createSequentialGroup()
 .addGap(48, 48, 48)
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING, false)
 .addGroup(layout.createSequentialGroup()
 .addComponent(exitButton)
 .addGap(54, 54, 54)
 .addComponent(calcButton)
 .addGap(87, 87, 87)
 .addComponent(clearButton))
 .addComponent(results, 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()
 .addGap(24, 24, 24)
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
 .addComponent(lAmountLabel)
 .addComponent(termIntLabel)
 .addComponent(mPaymentLabel))
 .addPreferredGap(javax.swing.LayoutStyle.Component Placement.UNRELATED)
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
 .addComponent(termInt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
 .addComponent(lAmount, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
 .addComponent(mPayment, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
 .addGap(124, 124, 124)
 .addComponent(results, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
 .addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED, 165, Short.MAX_VALUE)
 .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
 .addComponent(clearButton)
 .addComponent(calcButton)
 .addComponent(exitButton))
 .addContainerGap())
 );
 
pack();
 }// </editor-fold>
 
private void exitButtonActionPerformed(java.awt.event.ActionEve nt evt) {
 System.exit(0);
 }
 
private void clearButtonActionPerformed(java.awt.event.ActionEv ent evt) {
 lAmount.setText("");
 mPayment.setText("");
 jTextArea1.setText("");
 }
 
 private void calcButtonActionPerformed(java.awt.event.ActionEve nt evt) {
 Integer termInt1;
 termInt1 = termInt.getSelectedIndex();
 if (termInt1 == 0)
 { 
 
}
 if (termInt1 == 1)
 {
 interest = iRate [0];
 term = years [0];
 }
 if (termInt1 == 2)
 {
 interest = iRate [1];
 term = years [1];
 }
 if (termInt1 == 3)
 {
 interest = iRate [2];
 term = years [2];
 }
 double monthRate = iRate1 /12;
 
 mPayment1 = amount *(monthRate / (1-Math.pow(1 + monthRate, -tMonths)));
 amount = Double.parseDouble(lAmount.getText());
 mPayment.setText(currency.format(mPayment1) + " ");
 repaint();
 tMonths = term * 12;
 balance = amount;
 
 
 for (months = 1; months <= tMonths; months++)
 {
 mRate = iRate1 /12;
 mRatePaid = balance * mRate;
 mPrinciple = mPayment1 - mRatePaid;
 balance = balance - mPrinciple;
 jTextArea1.append(" "+ months + "\t\t " + ePay.format(mPayment1) +"\t\t" + ePay.format(mRatePaid) + "\t\t" + ePay.format (balance) + "\n");
 }
 }
 
 /**
 * @param args the command line arguments
 */
 public static void main(String args[]) {
 /*
 * Set the Nimbus look and feel
 */
 //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
 /*
 * If Nimbus (introduced in Java SE 6) is not available, stay with the
 * default look and feel. For details see
 * How to Set the Look and Feel (The Java™ Tutorials > Creating a GUI With JFC/Swing > Modifying the Look and Feel)
 */
 try {
 for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
 if ("Nimbus".equals(info.getName())) {
 javax.swing.UIManager.setLookAndFeel(info.getClass Name());
 break;
 }
 }
 } catch (ClassNotFoundException ex) {
 java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
 } catch (InstantiationException ex) {
 java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
 } catch (IllegalAccessException ex) {
 java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
 } catch (javax.swing.UnsupportedLookAndFeelException ex) {
 java.util.logging.Logger.getLogger(WeekThreeCalc.c lass.getName()).log(java.util.logging.Level.SEVERE , null, ex);
 }
 //</editor-fold>
 
/*
 * Create and display the form
 */
 java.awt.EventQueue.invokeLater(new Runnable() {
 
public void run() {
 new WeekThreeCalc().setVisible(true);
 }
 });
 }
 
 // Variables declaration - do not modify
 private javax.swing.JButton calcButton;
 private javax.swing.JButton clearButton;
 private javax.swing.JButton exitButton;
 private javax.swing.JScrollPane jScrollPane1;
 private javax.swing.JTextArea jTextArea1;
 private javax.swing.JTextField lAmount;
 private javax.swing.JLabel lAmountLabel;
 private javax.swing.JTextField mPayment;
 private javax.swing.JLabel mPaymentLabel;
 private java.awt.ScrollPane results;
 private javax.swing.JComboBox termInt;
 private javax.swing.JLabel termIntLabel;
 // End of variables declaration
 }