Netbean variable declaration help

Question

I've been trying to crank out yet another mortgage program. The problem I have is with the declaration of the following
double loan = Double.parseDouble(loanField.getText());
double rate = Double.parseDouble(rateField.getText());
double years_due = Double.parseDouble(years_dueField.getText());
I'm not quite certain if it's the declaration itself, or if I didn't set up the GUI properly. I've been tinkering with this for 3 days so I figured I'd ask for help. I can't seem to find a post that suitably answers my question. Any help would be appreciated. Here is the code. I'm using Netbean IDE 6.0.1 if that is of any use to you.
* week2_herbieGUI.java
* Created on August 1, 2008, 6:45 PM
* @author  archon
public class week2_herbieGUI extends javax.swing.JFrame {
    /** Creates new form week2_herbieGUI */
    public week2_herbieGUI() {
        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">
    private void initComponents() {
        loanfield = new javax.swing.JTextField();
        ratefield = new javax.swing.JTextField();
        years_duefield = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        PaymentLabel = new javax.swing.JLabel();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("PaymentCalculatorGUI");
        loanfield.setName("loanField"); // NOI18N
        ratefield.setText("jTextField2");
        ratefield.setName("rateField"); // NOI18N
        years_duefield.setName("years_dueField"); // NOI18N
        jLabel1.setText("Principle Loan");
        jLabel1.setName("Principle Loan"); // NOI18N
        jLabel2.setText("Interest Rate");
        jLabel2.setName("Interest Rate"); // NOI18N
        jLabel3.setText("Years of Mortgage");
        jLabel3.setName("Years of Mortgage"); // NOI18N
        jButton1.setText("Calculate");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        PaymentLabel.setText("Monthly Payment");
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(22, 22, 22)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jButton1)
                        .addGap(31, 31, 31)
                        .addComponent(PaymentLabel))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1)
                            .addComponent(jLabel2)
                            .addComponent(jLabel3))
                        .addGap(25, 25, 25)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(ratefield, javax.swing.GroupLayout.DEFAULT_SIZE, 118, Short.MAX_VALUE)
                            .addComponent(loanfield)
                            .addComponent(years_duefield, javax.swing.GroupLayout.PREFERRED_SIZE, 49, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap(180, Short.MAX_VALUE))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(loanfield, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(ratefield, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(years_duefield, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(26, 26, 26)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(PaymentLabel))
                .addContainerGap(25, Short.MAX_VALUE))
        pack();
    }// </editor-fold>
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
      //gather necessary variables from user
        double loan = Double.parseDouble(loanField.getText());
        double rate = Double.parseDouble(rateField.getText());
        double years_due = Double.parseDouble(years_dueField.getText());
      //Variables derived from user input
        double rate_total = rate/100; //Converts interest rate to decimal form
        double rate_monthly = rate_total/12; //converts to monthly interest rate
        double payment_year = years_due * 12; //Number of payments during course of mortgage.
        double payment = (loan * rate_monthly) / (1 - Math.pow(1 + rate_monthly, - payment_year)); //Calculates monthly payment
        PaymentLabel.setText("Your monthly payment is $" +payment);
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new week2_herbieGUI().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JLabel PaymentLabel;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JTextField loanfield;
    private javax.swing.JTextField ratefield;
    private javax.swing.JTextField years_duefield;
    // End of variables declaration
}

Answer 1

ThousandSon wrote:
Here is what the computer says:
Cannot find symbol
symbol: variable loanField
location: class week2_herbieGUI
Cannot find Symbol
Symbol: method getText()
location: class loanField
And it says the same thing for rateField and years_dueFieldThank you for finally posting the error message--it didn't hurt a bit did it. Had you posted it in the first place you would have had your answer 6 posts ago and probably a lot more planely.
Please take special note of how this autocode has been generated and especially close attention to naming conventions:
    // Variables declaration - do not modify
    private javax.swing.JLabel PaymentLabel;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JTextField loanfield;
    private javax.swing.JTextField ratefield;
    private javax.swing.JTextField years_duefield;
    // End of variables declarationThere in lay your problems, please look this block of code over very carefully and compare it to the errors you are getting and the code you have cut based on this autocode.
Look very very closely. The same error exists in every one of your problems. If that doesn't do it for you, then you can look in the initComponents method and how each of these variables are referenced there. Do you see the difference? (Hint: it is the error.)
BTW: does it show that I really despise when someone chooses to use autogenerated code and then asks how to correct errors from using it--and especially when they don't want to give the exact errors so we don't have to fish through all of the autocode to find out what is happening?