Parsing from a GUI text field

**jdubicki** · May 16th, 2012, 02:55 PM

Hello,

Here is my issue. I am trying to parse the string entered into the JTextField of my GUI so that it can be used in a calculation. The GUI is in one class and the calculation is in another. I hope someone can help me. My code follows:

public class GUI extends javax.swing.JFrame {
 
    MortgageCalculator calculate = new MortgageCalculator();
 
    //Creates new form MortgageCalculatorGUI
    public GUI() {
        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">//GEN-BEGIN:initComponents
    private void initComponents() {
 
        jPanel1 = new javax.swing.JPanel();
        JLabelPrincipal = new javax.swing.JLabel();
        JLabelInterestRate = new javax.swing.JLabel();
        JLabelTerm = new javax.swing.JLabel();
        jTextFieldPrincipal = new javax.swing.JTextField();
        jTextFieldInterestRate = new javax.swing.JTextField();
        jTextFieldTerm = new javax.swing.JTextField();
        jPanel2 = new javax.swing.JPanel();
        jButtonSubmit = new javax.swing.JButton();
        jButtonClear = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextAreaMonthlyPayment = new javax.swing.JTextArea();
        jLabelMonthlyPaymentInfo = new javax.swing.JLabel();
        jScrollPane2 = new javax.swing.JScrollPane();
        jTextAreaAmortizationInfo = new javax.swing.JTextArea();
        jLabelAmortizationInfo = new javax.swing.JLabel();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());
 
        JLabelPrincipal.setText("Principal");
 
        JLabelInterestRate.setText("Interest Rate");
 
        JLabelTerm.setText("Term");
 
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(JLabelTerm, javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(JLabelInterestRate, javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(JLabelPrincipal, javax.swing.GroupLayout.Alignment.TRAILING))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                        .addComponent(jTextFieldTerm, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 55, Short.MAX_VALUE)
                        .addComponent(jTextFieldInterestRate, javax.swing.GroupLayout.Alignment.LEADING))
                    .addComponent(jTextFieldPrincipal, javax.swing.GroupLayout.PREFERRED_SIZE, 169, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(JLabelPrincipal)
                    .addComponent(jTextFieldPrincipal, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(JLabelInterestRate)
                    .addComponent(jTextFieldInterestRate, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(JLabelTerm)
                    .addComponent(jTextFieldTerm, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
 
        jPanel2.setBorder(javax.swing.BorderFactory.createEtchedBorder());
 
        jButtonSubmit.setText("Submit");
        jButtonSubmit.setDoubleBuffered(true);
        jButtonSubmit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButtonSubmitActionPerformed(evt);
            }
        });
 
        jButtonClear.setText("Clear");
        jButtonClear.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButtonClearActionPerformed(evt);
            }
        });
 
        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jButtonSubmit, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jButtonClear)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
 
        jPanel2Layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jButtonClear, jButtonSubmit});
 
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButtonSubmit)
                    .addComponent(jButtonClear))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
 
        jTextAreaMonthlyPayment.setColumns(20);
        jTextAreaMonthlyPayment.setRows(5);
        jScrollPane1.setViewportView(jTextAreaMonthlyPayment);
 
        jLabelMonthlyPaymentInfo.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabelMonthlyPaymentInfo.setText("Monthly Payment Information");
 
        jTextAreaAmortizationInfo.setColumns(20);
        jTextAreaAmortizationInfo.setEditable(false);
        jTextAreaAmortizationInfo.setRows(5);
        jScrollPane2.setViewportView(jTextAreaAmortizationInfo);
 
        jLabelAmortizationInfo.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabelAmortizationInfo.setText("Loan Amortization Information");
 
        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.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(jScrollPane2)
                    .addComponent(jLabelMonthlyPaymentInfo, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 0, Short.MAX_VALUE)
                    .addComponent(jScrollPane1)
                    .addComponent(jLabelAmortizationInfo, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jLabelMonthlyPaymentInfo)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jLabelAmortizationInfo)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 163, Short.MAX_VALUE)
                .addContainerGap())
        );
 
        pack();
    }// </editor-fold>//GEN-END:initComponents
 
    // Action listener for Submit button
    private void jButtonSubmitActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButtonSubmitActionPerformed
 
	calculate.displayLoanInformation(jTextAreaMonthlyPayment);
    calculate.amortization(jTextAreaAmortizationInfo);
    }//GEN-LAST:event_jButtonSubmitActionPerformed
 
    // Action listener for Clear button
    private void jButtonClearActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButtonClearActionPerformed
    jTextFieldPrincipal.setText("");
    jTextFieldTerm.setText("");
    jTextFieldInterestRate.setText("");
    jTextAreaMonthlyPayment.setText("");
    jTextAreaAmortizationInfo.setText("");
    }//GEN-LAST:event_jButtonClearActionPerformed
 
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
 
        //Create and display the form
        java.awt.EventQueue.invokeLater(new Runnable() {
 
            @Override
            public void run() {
                new GUI().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel JLabelInterestRate;
    private javax.swing.JLabel JLabelPrincipal;
    private javax.swing.JLabel JLabelTerm;
    private javax.swing.JButton jButtonClear;
    private javax.swing.JButton jButtonSubmit;
    private javax.swing.JLabel jLabelAmortizationInfo;
    private javax.swing.JLabel jLabelMonthlyPaymentInfo;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JTextArea jTextAreaAmortizationInfo;
    private javax.swing.JTextArea jTextAreaMonthlyPayment;
    private javax.swing.JTextField jTextFieldInterestRate;
    private javax.swing.JTextField jTextFieldPrincipal;
    private javax.swing.JTextField jTextFieldTerm;
    // End of variables declaration//GEN-END:variables
}

import java.text.DecimalFormat;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
 
public class MortgageCalculator {
 
    //Declare decimal format that will display selected variable as dollar amounts
    DecimalFormat Money = new DecimalFormat ("$###,##0.00");
 
    //Loan Amount, Interest Rate, and Term are hard coded
    double principal = 1000;
    double interestRate = 2;
    double term = 1;
 
    //Declare Monthly Payment
    double monthlyPayment = calculateMonthlyPayment(principal, interestRate, term);
 
    //Declare Total Interest Paid
    double totalInterestPaid = calculateTotalInterestPaid(principal, interestRate, term);
 
    //Monthly Payment calculation
    public double calculateMonthlyPayment(double principal, double interestRate, double term) {
        if ((principal < 1) || (principal > 1000)) {
            JOptionPane.showMessageDialog(null, "Please enter a number between 1 and 1000");
        }
        return (principal * (interestRate / 100) / 12)/
                (1- Math.pow (1 + (interestRate / 100) / 12, - term * 12));
    }
 
    //Total Interest Paid calculation
    public double calculateTotalInterestPaid(double principal, double interestRate, double term) {
        return (principal * (interestRate / 100) /12) * (term * 12);
    }
 
//    //Print loan information to the console
    public void displayLoanInformation(JTextArea LoanInfoOutput) {
        LoanInfoOutput.append("Loan Amount = " + 
                (Money.format(principal)) + "\n");
        LoanInfoOutput.append("Interest Rate = " + interestRate + "%" + "\n");
        LoanInfoOutput.append("Term = " + term + " Years" + "\n");
        LoanInfoOutput.append("Monthly Mortgage Payment = " + 
                (Money.format(monthlyPayment)) + "\n");
        LoanInfoOutput.append("Total Interest Paid = " + 
                (Money.format(totalInterestPaid)));
    }
 
    //Print amortization information to the console
    public void amortization(JTextArea AmortizationOutput) {
 
        //Iterate amortization through the life of the loan
        for (int payment = 1; payment <= term * 12; payment++) {
 
            //Current monthly interest
            double currentMonthlyInterest = principal * (interestRate / 100) / 12;
            double newPrincipal = monthlyPayment - currentMonthlyInterest;
            double newPrincipalBalance = principal - newPrincipal;
            principal = newPrincipalBalance;
 
            //Print out the results of the loan amortization to the console
            AmortizationOutput.append("Payment " + payment + "\n");
            AmortizationOutput.append("Monthly Interest Paid = " + 
                    (Money.format(currentMonthlyInterest)) + "\n");
            AmortizationOutput.append("New Loan Balance = " + 
                    (Money.format(newPrincipalBalance)) + "\n");
            AmortizationOutput.append("\n");
        }
    }
}

import javax.swing.JTextArea;
 
public class GUIOutput {
    public void ClearjTextAreaMonthlyPayment(JTextArea LoanInfoOutput) {
        LoanInfoOutput.setText("");
    }
 
    public void ClearjTextAreaAmortizationInfo(JTextArea AmortizationOutput) {
        AmortizationOutput.setText("");
    }
}

**Norm** · May 16th, 2012, 04:41 PM

Can you explain your problem?
Getting a String from a text field
Parsing a String

**jdubicki** · May 17th, 2012, 07:42 AM

This is a mortgage calculator made up of three classes; GUI, GUIOutput, and MortgageCalculator, The GUIOutput class is still under development and not being used. The GUI class has three JTextFields for principal, interest rate, and term. I need to get the string values that would be entered in the fields to be converted to doubles so that they can be used in the calculations that are in the MortgageCalculator class.

**KevinWorkman** · May 17th, 2012, 07:49 AM

And which part of that are you having trouble with? Getting the String from the text field? Converting it to a double? Using it in calculations? Getting it into the other class?

**Norm** · May 17th, 2012, 07:54 AM

I need to get the string values that would be entered in the fields

Where are the textfields defined? Can you access them directly and call any of their methods or do you need methods in the class that contains the textfields that you can call that will get the contents of the textfields and return them?
The GUI class needs to have methods the MortgageCalculator class can call to get the values it needs.

**jdubicki** · May 17th, 2012, 03:43 PM

As of right now the principal, interest rate, and term are hard coded in the Mortgagecalculator class. Ultimately I want to pull the value entered into the given text field and use it in the calculation. For Example A user will enter the value 1000 into the text field labeled principal of the GUI. When the press the "Submit" button. that value will be passed into the MortgageCalculator class, converted to a double and assigned to the principal variable so that it can be used in the calculations. I'm really not quite sure how I can better explain this.

**Norm** · May 17th, 2012, 03:46 PM

One class has the data, another class wants it.
The class that wants it needs to call a method in the class that has it.
Or the class that has the data can call a method in the class that wants it and pass it the data as a parameter in the method.

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