One error in code..not understanding what it tells me. Code works it is on line 55.

[LeeAnne Murphy]

/*
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package wk4calcjp2;

/**
 *
 * @author LeeAnne Murphy
 * Java Programming 2/ PRG 421
 * Due Date August 29, 2011
 * Week 4 - SR-mf-003 Change Request #6
 
 * Write the program in Java (with a graphical user interface) so that it will allow
 * the user to select which way they want to calculate a mortgage: by input of the
 * amount of the mortgage, the term of the mortgage, and the interest rate
 * of the mortgage payment or by input of the amount of a mortgage and then select
 * from a menu of mortgage loans:
 
 * - 7 year at 5.35%
 * - 15 year at 5.5 %
 * - 30 year at 5.75%
 
 * In either case, display the mortgage payment amount and then, list the loan balance
 * and interest paid for each payment over the term of the loan. Allow the user to loop
 * back and enter a new amount and make a new selection, or quit.
 * Insert comments in the program to document the program.
 */

        import java.awt.BorderLayout;               // Code to Import and Provide Layout of Window
	import java.awt.GridLayout;                 // Code to Import the Layout in Grid Format
	import java.awt.event.ActionEvent;          // Code to Import Action
	import java.awt.event.ActionListener;       // Code to Import Listener for Action
	import javax.swing.JButton;                 // Code to Import Use of Buttons
	import javax.swing.JFrame;                  // Code to Import Use of Frame
	import javax.swing.JLabel;                  // Code to Import Use of Label
	import javax.swing.JPanel;                  // Code to Import Use of Panel
	import javax.swing.JTextField;              // Code to Import Use of Text Field
	import javax.swing.JTextArea;               // Code to Import Use of Text Area
	import javax.swing.JScrollPane;             // Code to Import Scroll Pane
	import javax.swing.JComboBox;               // Code to Import JCombo Box
	import java.text.DecimalFormat;             // Code to Import Decimal Format
	import javax.swing.BorderFactory;           // Code to Import Border
	import javax.swing.ButtonGroup;             // Code to Import Button Group
	import javax.swing.JCheckBox;
	 
	// Create Mortgage Payment Class
public class Wk4calcjp2 extends JFrame {
	 
	    DecimalFormat Dollar = new DecimalFormat("$###,###.00");
	 
	    // Beginning of Main
	    public static void main(String[] args) {
	 
        [b]Wk4calcjp2 newloan = new Wk4calcjp2()); [/b]  

// Create Instance of Class
	 
	    } 
		// End main
	 
	    // Declare Variables and Values
	    private double principalBalance;         // Amount of Loan
	    private double loanTerm;                 // Term of Loan
	    private double loanRate;                 // Interest Rate of Loan
	    private double monthlyPayment;           // Amount of Monthly Payment
	    private double monthlyInterestRate;      // Amount of Monthly Interest Rate
	    private double interestMonthly;          // Amount of Monthly Interest
	    private double monthlyPrinciple;         // Amount of Monthly Principle
	    private double loanBalance;              // Balance of Loan
	 
	    double newBalance;                       // New Monthly Balance of Loan
	     
	    // GUI elements to Display Current Information
	    private JLabel labelPrincipal = new JLabel("   Mortgage Principal : ");
	    private JTextField txtPrincipal = new JTextField(10);
	    private JLabel labelYears = new JLabel("   Mortgage Time In Years : ");
	    private JTextField txtYears = new JTextField(10);
	    private JLabel labelRate = new JLabel("   Amount Interest Rate : ");
	    private JTextField txtRate = new JTextField(10);
	    private JCheckBox buttonEnterValue = new JCheckBox("Enter Value");
	    private JCheckBox buttonselectValue = new JCheckBox("Select Value");
	    private ButtonGroup group = new ButtonGroup();
	    private JTextArea result = new JTextArea(10, 20);
	    private JScrollPane scrollResult = new JScrollPane(result);
	    private JButton buttonCalc = new JButton("Calculate");
	    private JButton buttonClear = new JButton("Clear");
	    private JButton buttonExit = new JButton("Exit");
	    private JPanel panel = new JPanel();
	    private String loanPlan[] = {"Select Loan", "7 years at 5.35%", "15 years at 5.5%", "30 years at 5.75%"};
	    private JLabel labelPlan = new JLabel("   Mortgage Plan : ");
	    private JComboBox comboBox = new JComboBox(loanPlan);
	 
   /**
     * @param args the command line arguments
     */
   // Create Container for Information
	    public Wk4calcjp2() {
	 
	        buttonCalc.addActionListener(new ActionListener() // Adds an action listener to the calc button. The action listener will be called if button is selected.
	        {
	 
	            public void actionPerformed(ActionEvent e) {
	                onButtonCalculate(); // Calculates information when clicked
	            }
	        });
	 
	        buttonClear.addActionListener(new ActionListener() // Adds an action listener to the clear button. The action listener will be called if button is selected.
	        {
	 
	            public void actionPerformed(ActionEvent e) {
	                onButtonClear(); // Clears information when clicked
	            }
	        });
	 
	        //Declares button to clear (reset) the data
	 
	        buttonExit.addActionListener(new ActionListener() // Adds an action listener to the exit button. The action listener will be called if button is selected.
	        {

	            public void actionPerformed(ActionEvent e) {
	                onButtonExit(); //Exits the program when clicked
	            }	        });
	 
	        panel.setLayout(new GridLayout(6, 4, 6, 6));
	 
	        panel.add(labelPrincipal);
	        panel.add(txtPrincipal);
	 
	        buttonEnterValue.setText("Enter Values      OR "); //Checkbox selection fpr user entry
	        buttonselectValue.setText("Select Values "); // Checkbox selection for user to select values
	 
	        group.add(buttonEnterValue); //Adds a button to a radio button group.
	        buttonEnterValue.addActionListener(new ActionListener() { // Adds an action listener to the radio button. The action listener will be called if button is selected.
	 
	            public void actionPerformed(ActionEvent e) {
	                buttonEnterValuesActionPerformed(e);
	            }
	        });
	        buttonEnterValue.setSelected(true); // Sets selected status of a radio button to true
	        group.add(buttonselectValue); // Adds a button to a radio button group.
	        buttonselectValue.addActionListener(new ActionListener() { // Adds an action listener to the radio button. The action listener will be called if button is selected.
	 
	            public void actionPerformed(ActionEvent e) {
	                buttonselectValuesActionPerformed(e);
	            }
	        });
	 
	        panel.add(buttonEnterValue);
	        panel.add(buttonselectValue);
	 
	        panel.add(labelYears);
	        panel.add(txtYears);
	 
	        panel.add(labelRate);
	        panel.add(txtRate);
	 
	        panel.add(buttonCalc);
	        panel.add(buttonClear);
	        panel.add(buttonExit);
	 
	 
	        setLayout(new BorderLayout());
	 
	        panel.setBorder(BorderFactory.createTitledBorder(
	                BorderFactory.createEtchedBorder(), "Loan Plan")); // Creates etched border
	 
	        add(panel, BorderLayout.CENTER);
	 
	        add(scrollResult, BorderLayout.SOUTH);
	 
	        pack();
	        setDefaultCloseOperation(EXIT_ON_CLOSE);
	        setResizable(false);
	        setTitle("Mortgage Calculator");
	        setVisible(true);
	    }
	 
	    public void buttonEnterValuesActionPerformed(ActionEvent e) {
	        if (buttonEnterValue.isSelected()) { // Returns true if button is selected.
	            panel.removeAll();
	            panel.add(labelPrincipal);
	            panel.add(txtPrincipal);
	 
	            panel.add(buttonEnterValue);
	            panel.add(buttonselectValue);
	 
	            panel.add(labelYears);
	            panel.add(txtYears);
	 
	            panel.add(labelRate);
	            panel.add(txtRate);
	 
	            panel.add(buttonCalc);
	            panel.add(buttonClear);
	            panel.add(buttonExit);
	 
	            setVisible(true);
	        }
	    }
	 
	    public void buttonselectValuesActionPerformed(ActionEvent e) {
	        if (buttonselectValue.isSelected()) { // Returns true if button is selected.
	            panel.removeAll();
	            panel.add(labelPrincipal);
	            panel.add(txtPrincipal);
	 
	            panel.add(buttonEnterValue);
	            panel.add(buttonselectValue);
	 
	            panel.add(labelPlan);
	            panel.add(comboBox);
	 
	            panel.add(buttonCalc);
	            panel.add(buttonClear);
	            panel.add(buttonExit);
	 
	            setVisible(true);
	        }
	    }
	    // Calculate Information
	    public void onButtonCalculate() {
	        double loanAmt = Double.parseDouble(txtPrincipal.getText());
	        assignLoanAmount(loanAmt);      // Assign Amount of Loan
	 
	        if (buttonEnterValue.isSelected()) {
	            double rate = Double.parseDouble(txtRate.getText());
	            assignLoanRate(rate);
	 
	            double years = Double.parseDouble(txtYears.getText());
	            assignLoanTerm(years * 12);
	 
	        } else {
	            String str = (String) comboBox.getSelectedItem();
	            if (str.equals("7 years at 5.35%")) {
	                assignLoanRate(5.35);
	                assignLoanTerm(7 * 12);
	            } else if (str.equals("15 years at 5.5%")) {
	                assignLoanRate(5.5);
	                assignLoanTerm(15 * 12);
	            } else if (str.equals("30 years at 5.75%")) {
	                assignLoanRate(5.75);
	                assignLoanTerm(30 * 12);
	            }
	        }
	 
	        calcMonthlyPayment();     // Calculate Monthly Payment of Loan
	        calcMonthlyInterest();    // Calculate Monthly Interest on Loan
	        calcMonthlyPrinciple();   // Calculate Monthly Principle of Payment
	        calcLoanBalance();        // Calculate Loan Balance
	        calcNewBalance();         // Calculate New Balance Each Month
	        displayAmounts();         // Display All Amounts
	        monthlyLoanAmount();
	        monthlyInterestBalance(getAssignLoanAmount(), getAssignLoanTerm(), getAssignLoanRate());
	 
	    }
	 
	    // Information for Button
	    public void onButtonClear() {
	       txtPrincipal.setText("");
	        txtYears.setText("");
	        txtRate.setText("");
	        result.setText("");
	    }
	 
	    // Information for Exit Button
	    public void onButtonExit() {
	    System.exit(0);
	    }
	 
	    // Display Methods to Print Values for Morgage Calculator
	    public void assignLoanAmount(double loanAmount) {
	        principalBalance = loanAmount;
	    }
	 
	    public void assignLoanRate(double interestAmount) {
	        loanRate = interestAmount;
	    }
	 
	    public void assignLoanTerm(double termAmount) {
	        loanTerm = termAmount;
	    }
	 
	    public double getAssignLoanAmount() {
	        return principalBalance;
	    }
	 
	    public double getAssignLoanRate() {
	        return loanRate;
	    }
	 
	    public double getAssignLoanTerm() {
	        return loanTerm;
	    }
	 
	    public void calcMonthlyPayment() {
	        interestMonthly = (loanRate / 100) / 12;
	        monthlyPayment = principalBalance * ((interestMonthly * (Math.pow((1 + interestMonthly), loanTerm)))
	                / (Math.pow((1 + interestMonthly), loanTerm) - 1));
	    }
	 
	    public void calcMonthlyInterest() {
	        monthlyInterestRate = (loanRate / 12) / 100;
	        interestMonthly = principalBalance * monthlyInterestRate;
	    }
	 
	    public void calcMonthlyPrinciple() {
	        monthlyPrinciple = monthlyPayment - interestMonthly;
	    }
	 
	    public void calcLoanBalance() {
	        loanBalance = principalBalance - monthlyPrinciple;
	    }
	 
	    public void calcNewBalance() {
	        newBalance = loanBalance - monthlyPrinciple;
	    }
	 
	    public void monthlyLoanAmount() {
	        result.append("Month\tLoanBalance\tInterest Paid\n");
	        double newloanTerm = loanTerm;
	        while (newloanTerm > 0) {
	            double loanMonths = loanTerm - newloanTerm;
	 
	            double newMonthlyBalance = principalBalance * ((Math.pow((1 + monthlyInterestRate), loanTerm))
	                    - (Math.pow((1 + monthlyInterestRate), loanMonths))) / (Math.pow((1 + monthlyInterestRate), loanTerm) - 1);
	 
	            double monthlyamountInterest = newMonthlyBalance * monthlyInterestRate;
	 
	            result.append("" + Math.round(newloanTerm) + "\t" + Dollar.format(newMonthlyBalance) + "\t"
	                    + Dollar.format(monthlyamountInterest) + "\n");
	 
	            newloanTerm -= 1;
	        }
	    }
	 
	    public void monthlyInterestBalance(double loan, double term, double interestRate) {
	 
	        DecimalFormat df = new DecimalFormat("$###,###.00"); // Format Decimal Point
	 
	        double monthlyRate = (interestRate / (12 * 100));   // Get Monthly Interest Rate
	        // Calculate Discount Factor
	        double discountFactor = (Math.pow((1 + monthlyRate), term) - 1) / (monthlyRate * Math.pow((1 + monthlyRate), term));
	        double payment1 = loan / discountFactor;  // Calculate Monthly Payment
	 
	        // Display Program Results
	        result.append("\nLoan Amount = " + df.format(loan));
	        result.append("\nInterest Rate = " + interestRate + "%");
	        result.append("\nLength of Loan = " + Math.round(term / 12) + " years");
	        result.append("\nMonthly Payment = " + df.format(payment1) + "\n");
	    }
	 
	    public void displayAmounts() {
	        System.out.println("Loan Amount = " + Dollar.format(principalBalance));       // Show Original Loan Amount
	        System.out.println("Interest Rate = " + loanRate + "%");                      // Show Interest Rate
	        System.out.println("Length of Loan = " + Math.round(loanTerm) + " months");   // Show Length of Loan
	        System.out.println("Monthly Payment = " + Dollar.format(monthlyPayment));     // Show Monthly Payment
	    }
	} // End Wk4calcjp2 program

Wk4calcjp2 newloan = new Wk4calcjp2()); (error says ';' expected) what does that mean?

[Edit: fixed code tags]

[Joanne Neal]

It means it's expecting a ; after the closing bracket of the method call, but the first character it finds is actually a second closing bracket.

[LeeAnne Murphy]

Ah got it...I removed the 2nd bracket.. and it cleared the error. Thank you.

[Campbell Ritchie]

It takes a long time to get used to the compiler error messages. Google for mindprod java compiler error and you should find some helpful information.