[Zilna]

What I am having to accomplish is some form of manual entry for this calculator, this way he user also has the option to enter in their own requirements of interest and length of the mortgage. In order to accomplish this I have added an option for "Other" from the drop down box allowing the user to manually enter in their own information but it seems that the program does no seem to like the blank entries for his selection and is throwing an error relating to incompatible types on lines 229 and 230 stating that a double is required, but when I try to simply put "double" in front of the lines then it throws an error on line 228. Any way of correcting this problem that I am missing?

/*
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 * and open the template in the editor.
 */

package mortcalc5;

import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.SwingUtilities;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.table.DefaultTableModel;

/**
 *
 * @author
 * 
 * 
 */


public class Main extends JFrame {

    static String mortgage[] = { "Select Mortgage", "30 years at 5.75%", "15 years at 5.5%", "7 years at 5.35%", "Other" };
    static String[] toReplace;
    DecimalFormat money = new DecimalFormat("$###,###.00");

    // Define the JPanel where we will draw and place all of our components.
    JPanel contentPanel = null;

    // GUI elements to display labels, fields, table, scroll pane for current
    // information
    JLabel main_title = null;
    JLabel principal_label = null;
    JTextField principal_text = null;
    JLabel years_label = null;
    JTextField years_text = null;
    JLabel rate_label = null;
    JTextField rate_text = null;
    JLabel choose_label = null;
    JComboBox choose_combo = null;
    JRadioButton rbutton01 = null;
    JRadioButton rbutton02 = null;
    ButtonGroup buttongroup = null;

    // GUI text area for results with scroll pane
    JTextArea result = null;
    JScrollPane scrolling_result = null;

    // GUI for Table with scroll pane
    MyJTable total_amounts = null;
    JScrollPane scrolling_table = null;
    MyDTableModel model;

    // Creates the button for calculation of the mortgage payments
    JButton btnCalculate = null;

    // Creates a button for reset button
    JButton btnReset = null;

    // Declaration of variables
        int numberOfLinesGenerated=1;
        int number_years; //term mortgage
        double principal; // amount borrowed
        double interest_rate;  // interest for mortgage
        double monthly_payment;  // monthly payment for mortgage
        double monthly_interest_rate ; // monthly interest
        int number_of_months; // number of months for mortgage payments
        double interest_paid; //interest amount added for each month
        double principal_paid;

    // This is the class constructor - initialize the components
    public Main() {
        super();
        initialize();
    }

    // Window size, JPanel, setTitle
    public void initialize() {
        this.setSize(720, 730);
        this.setContentPane(getJPanel());
        this.setTitle("McBride Financial");
    }

    public JPanel getJPanel() {
        if (contentPanel == null) {
            contentPanel = new JPanel();
            contentPanel.setLayout(null);
            contentPanel.setBackground(Color.blue);

            // GUI elements to display labels and fields for current information
            // to include Alignment, Boundary, Title, Font, Font Size, Color
            // Main Title of the Calculator
            main_title = new JLabel();
            main_title.setHorizontalAlignment(SwingConstants.CENTER);
            main_title.setBounds(130, 20, 400, 30);
            main_title.setText("Loan Amortization Calculator");
            main_title.setFont(new Font("Arial", Font.BOLD, 25));
            main_title.setForeground(Color.white);
            contentPanel.add(main_title);

            // Principal Label
            principal_label = new JLabel();
            principal_label.setHorizontalAlignment(SwingConstants.RIGHT);
            principal_label.setBounds(90, 65, 220, 25);
            principal_label.setText("Mortgage Principle Amount : ");
            principal_label.setFont(new Font("Arial", Font.BOLD, 13));
            principal_label.setForeground(Color.white);
            contentPanel.add(principal_label);

            // Principal Text Field Features
            principal_text = new JTextField();
            principal_text.setBounds(350, 65, 160, 25);
            contentPanel.add(principal_text);

            // Mortgage Plan Label
            choose_label = new JLabel();
            choose_label.setHorizontalAlignment(SwingConstants.RIGHT);
            choose_label.setBounds(90, 125, 220, 25);
            choose_label.setText("Select Mortgage Plan : ");
            choose_label.setFont(new Font("Arial", Font.BOLD, 13));
            choose_label.setForeground(Color.white);
            contentPanel.add(choose_label);

            // String for Mortgage Variation
            String mortgage[] = { "Select Mortgage", "30 years at 5.75%","15 years at 5.5%", "7 years at 5.35%", "Other" };
            choose_combo = new JComboBox(mortgage);
            choose_combo.setBounds(350, 125, 180, 30);
            choose_combo.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent event) {
                    setMortgage();
                }
            });

            contentPanel.add(choose_combo);

            // Text Area for result
            result = new JTextArea(5, 20);
            result.setBounds(170, 250, 350, 75);
            scrolling_result = new JScrollPane(result);
            contentPanel.add(result);

            //Table for amortization calculations
         total_amounts = new MyJTable();
         scrolling_table = new JScrollPane (total_amounts);
         scrolling_table.setBounds(25, 450, 650, 200);
         contentPanel.add(scrolling_table);

         // Number of Years Label
            years_label = new JLabel();
            years_label.setHorizontalAlignment(SwingConstants.RIGHT);
            years_label.setBounds(90, 200, 220, 25);
            years_label.setText("Mortgage Term : ");
            years_label.setFont(new Font("Arial", Font.BOLD, 13));
            years_label.setForeground(Color.white);
            contentPanel.add(years_label);

            // Number of Years Text Field
            years_text = new JTextField();
            years_text.setBounds(350, 205, 160, 25);
            contentPanel.add(years_text);

            // Annual Interest Rate Label
            rate_label = new JLabel();
            rate_label.setHorizontalAlignment(SwingConstants.RIGHT);
            rate_label.setBounds(90, 165, 220, 25);
            rate_label.setText("Annual Interest Rate(Decimal) : ");
            rate_label.setFont(new Font("Arial", Font.BOLD, 13));
            rate_label.setForeground(Color.white);
            contentPanel.add(rate_label);

            // Annual Interest Rate Text Field
            rate_text = new JTextField();
            rate_text.setBounds(350, 165, 160, 25);
            contentPanel.add(rate_text);

            // Button for reset button
            btnReset = new JButton();
            btnReset.setBounds(355, 350, 110, 30);
            btnReset.setText("Reset");
            contentPanel.add(btnReset);

           // Button for calculation of the mortgage payments
            btnCalculate = new JButton();
            btnCalculate.setBounds(245, 350, 110, 30);
            btnCalculate.setText("Calculate");
            contentPanel.add(btnCalculate);

            // Action listener to the reset button
            btnReset.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {
                    onButtonreset();
                }
            });

            btnCalculate.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {
                    principal=getDouble(principal_text.getText());
                    calculate();
                {

            //Gets the values from the combo box
         String str = (String)choose_combo.getSelectedItem();
           if (str.equals("30 years at 5.75%")) {
            interest_rate = 0.0575;
            number_years = 30;
                  }

            else
           if(str.equals("15 years at 5.5%")) {
           interest_rate = 0.055;
           number_years = 15;
                    }

           else
           if(str.equals("7 years at 5.35%")) {
           interest_rate = 0.0535;
           number_years = 15;
                }

           else
               if (str.equals("Other")){
                  interest_rate = "";
                  number_years = "";
               }
                 }

             //Calculates the number of months for mortgage
                    number_of_months = number_years * 12;

          //Caluclates the monthly interest rate
                    monthly_interest_rate = interest_rate/12.0;

          //Calculates the monthly payment for mortgage
                    monthly_payment = (principal* monthly_interest_rate)/(1 - Math.pow(1 + monthly_interest_rate, -number_of_months));

                   // Sets the result text
                    result.setText("Loan Amount = " + money.format(principal)
                    +"\nInterest Rate = " + (interest_rate * 100) +"%"+"\nLength of Loan = "
                    + Math.round(number_years * 12.0) + " months"+"\nMonthly Payment = "
                    + money.format(monthly_payment)); //calling the monthly_payment

                    // Have the necessary information for the model lets recalculate it.
                    if(total_amounts != null){
                        total_amounts.setModel(getModel());
                    }
                }
            });

            //Adds the calculate button
            contentPanel.add(btnCalculate);

            //Adds the scroll pane
            contentPanel.add(getScrollPane());
        }

        return contentPanel;
    }

//setMortgage Calculation//

    public void setMortgage() {
        String str = (String) choose_combo.getSelectedItem();
        if (str.equals("30 years at 5.75%")) {
            rate_text.setText("0.0575");
            years_text.setText("30");
            }

        else
      if(str.equals("15 years at 5.5%")) {
         rate_text.setText("0.055");
         years_text.setText("15");
                    }

      else
      if(str.equals("7 years at 5.35%")) {
         rate_text.setText("0.0535");
         years_text.setText("7");
        }

      else
          if(str.equals("Other")){
              rate_text.setText("");
              years_text.setText("");
          }
    }

// Information for Reset Button//
    public void onButtonreset() {
        principal_text.setText("");
        result.setText("");
        rate_text.setText("");
        years_text.setText("");
    }

// Calculate() call//


    public void calculate() {

        double principal = getDouble(principal_text.getText());
        int number_of_years = Integer.parseInt(years_text.getText());
        double interest_rate = getDouble(rate_text.getText());
        if(interest_rate > 1.0)interest_rate = interest_rate/100.0;

        // Calculates the number of months for mortgage so as to determine the number of payments to be made
                    int number_of_months = number_of_years * 12;

        // Calulates the monthly interest rate
                    double monthly_interest_rate = interest_rate / 12.0;

        // Equation that calculates the monthly payment for mortgage
                    double monthly_payment = (principal * monthly_interest_rate)/ (1 - Math.pow(1 + monthly_interest_rate, -number_of_months));

        // Sets the result text
        result.setText("Loan Amount = " + money.format(principal)
                + "\nInterest Rate = " + (interest_rate * 100) + "%"
                + "\nLength of Loan = " + Math.round(number_of_years * 12.0)
                + " months" + "\nMonthly Payment = "
                + money.format(monthly_payment)); // calling the monthly payment
    }

// This the Scroll pane for the table - sets the boundaries//
    public JScrollPane getScrollPane() {
        if (scrolling_table == null) {
            scrolling_table = new JScrollPane();
            scrolling_table.setBounds(65, 225, 425, 120);
            scrolling_table.setViewportView(getTable());
        }

        return scrolling_table;
    }

    public JTable getTable() {
        if (total_amounts == null) {
                total_amounts = new MyJTable(getModel());
       }

        return total_amounts;
    }
//This will calculate the model for the table//
    public MyDTableModel getModel() {
        String[] columnNames = {"Payment #", "Starting Balance", "Monthly Payment","Interest Paid","Principal Paid", "Ending Balance"};
        model = null;
        model = new MyDTableModel();

        for (int i = 0; i < 6; i++) {
            model.addColumn(columnNames[i]);
        }

        // Data to calculate the table
        if (principal > 0 && interest_rate != 0 && number_years != 0) {
            double new_principal = principal;
            NumberFormat nf = NumberFormat.getCurrencyInstance();

            for (int i = 0; i < number_of_months; i++) {
                Object data[] = new Object[6];
                data[0] = Integer.toString(i + 1);
                data[1] = nf.format(new_principal);
                data[2] = nf.format(monthly_payment);
                data[3] = nf.format(interest_paid = principal * monthly_interest_rate);
                data[4] = nf.format(principal_paid = monthly_payment - interest_paid);
                data[5] = nf.format(principal = principal - principal_paid);
                new_principal = principal;

                model.addRow(data);
            }
        }

        return model;
    }

     public double getDouble(String val) {
        double value = 00;
        try {

            // This tests to see if there is a dollar sign
            if (val.indexOf('$') > -1) {
                value = NumberFormat.getCurrencyInstance().parse(val)
                        .doubleValue();

            } else {
                value = NumberFormat.getNumberInstance().parse(val)
                        .doubleValue();
            }
        } catch (java.text.ParseException e) {

            // Generates an error here
            JOptionPane.showMessageDialog(this, "There is an error " + val
                    + ". Please check your entry", "Data Entry Error",
                    JOptionPane.ERROR_MESSAGE);
        }
        return value;
    }

    public double getPercent(String val) {
        boolean isPercent = false;
        double value = 0;
        try {
            if (val.indexOf('%') > -1) {
                value = NumberFormat.getPercentInstance().parse(val).doubleValue();
                isPercent = true;

            } else {
                value = NumberFormat.getNumberInstance().parse(val).doubleValue();
            }
        } catch (java.text.ParseException e) {
            JOptionPane.showMessageDialog(this, "There is an error " + val + ". Please check your entry", "Data Entry Error",
                    JOptionPane.ERROR_MESSAGE);
        }

        // Have a percentage already in decimal format
        if (!isPercent)
            value = value / 100.0;
        return value;
    }

// main method
    public static void main(String[] args) {

        // Using Nimbus "Look and Feel" to make the layout more appealing
        try {
            for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (UnsupportedLookAndFeelException e) {

            // handle exception
       } catch (ClassNotFoundException e) {

            // handle exception
     } catch (InstantiationException e) {

            // handle exception
        } catch (IllegalAccessException e) {

            // handle exception
        }

        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                Main thisClass = new Main();
                thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                thisClass.setVisible(true);
            }
        });
    }

    class MyDTableModel extends DefaultTableModel {

        public Class<? extends Object> getColumnClass(int c) {
            return getValueAt(0, c).getClass();
        }
    }

    //This class adds the table to the JFrame
    class MyJTable extends JTable {

        public MyJTable(){
            super();
        }

        public MyJTable(DefaultTableModel m){
            super(m);
        }
    }
}//End Program

[karabasf]

if (str.equals("Other")){
  interest_rate = "";
  number_years = "";
}

And:

int number_years; //term mortgage
double interest_rate;  // interest for mortgage

What you're trying to do, is assigning a string to an integer and a double variable. Obviously, this is not valid. As you probably want default value to be 0 (or some other value), change the given piece of code into

if (str.equals("Other")){
  interest_rate = 0; //Or some other value
  number_years = 0.0; //Or some other value
}

[Zilna]

If I change the variables to equal 0, then when I try to change them to something else of my choosing I get this to display for a mortgage of $5,000:

Loan Amount = $5,000.00
Interest Rate = 0.0%
Length of Loan = 0 months
Monthly Payment = �

By defaulting the variables to zero then it does not allow me to manually enter in anything else even if I do alter the entry boxes to other numbers of my choice. I would assume that there is another way but nothing that I can really think of right off the top of my head.

[karabasf]

Ah, now I see what you try to do. When you pick "other" as an option, you want the user to be able to fill in its own Interest Rate and the length of the loan (in months)

In that case, you need to retrieve the entry in the corresponding textboxes and parse them. This would result in:

if (str.equals("Other")){
  interest_rate = Double.parseDouble(rate_text.getText());
  number_years = Integer.parseInt(years_text.getText());
}

This code will parse the user entered values in the according text fields and uses the values to set the corresponding variables.

This should do the trick for you

Edit: Sorry I misread the opening post

This post has been edited by karabasf: 14 April 2012 - 12:30 PM

[Zilna]

omgosh, thanks!!! I have spent 2 weeks trying to get this to work. Once I see your code it makes perfect sense to me, but for some reason I could not figure it out for the life of me why it would not work the way that I wanted it to. Now I can move on to complete this week's assignment ... wish me luck!

[karabasf]

Glad I could help

Good luck with the next assignment