GUI Mortgage Calculator Part 2

Well, you just say
textField.getText() - this returns String
which you wil need to parse

double interest= Double.parseDouble(textField.getText());

Instead of this:
principal=getDouble(principal_text.getText());

should be

principal=Double.parseDouble(principal_text.getText());

double rate = Double.parseDouble(rate_text.getText());

Well, if you have such method, it may be OK

ASKER

objects: I tried yours "double rate" and it was not able to work.

for yan: yours produces the same results and does not work either.

both: I still can only use the drop down combo_box

perhaps I need to add another parse?

you can use getDouble() actually, your problem is you override whats in the text field with what selected in your combo.

ASKER

I understand, but I just can't get it to work. I need to override the combo like you said.

This somehow works:

/*
Joshua Gutierrez
University of Phoenix
PRG 421
Week 2 Individual Assignment
Java GUI/Service Request 4
Professor Matt Berg
May 2, 2011*/

// Importing Multiple Classes (Some Just In Case They Are Needed)

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.JComboBox;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;

import java.text.DecimalFormat;   //For display the monthly payments as money

public class GutierrezMortgageGui extends JFrame {

	static  String mortgage[] = {"Select Mortgage","30 years at 5.75%"};
   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

    		JScrollPane scrolling_table = null;

    // Creates the button for calculation of the mortgage payments

    		JButton btnCalculate = null;

	 // Creates a button for reset button

			JButton btnReset = null;

	 //Variables

			int numberOfLinesGenerated=1;
        	int number_years; //Term of the mortgage
        	double principal; // Total amount borrowed
        	double interest_rate;  //  Interest rate for mortgage
        	double monthly_payment;  // Monthly payment amount for mortgage
        	double monthly_interest_rate ; // Monthly interest rate
        	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 GutierrezMortgageGui() {
        	super();
        	initialize();
    }

	 //Window size, JPanel, setTitle

    	public void initialize() {
			this.setSize(700,500);
        	this.setContentPane(getJPanel());
        	this.setTitle("Gutierrez Mortgage GUI");
    }

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

            // 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("My First GUI Loan Calculator");
            main_title.setFont(new Font("Times New Roman", Font.BOLD, 30));
            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("Times New Roman", Font.BOLD, 15));
            principal_label.setForeground(Color.white);
            contentPanel.add(principal_label);

            //Principal Text Field Features

			   principal_text = new JTextField();
            principal_text.setBounds(350, 65, 160, 25);
            principal_text.setText(Double.toString(principal));
            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("Times New Roman", Font.BOLD, 15));
            choose_label.setForeground(Color.white);
            contentPanel.add(choose_label);

				//String for Mortgage Variation

            String mortgage[] = {"Select Mortgage","30 years at 5.75%"};
            choose_combo = new JComboBox(mortgage);
            choose_combo.setBounds(350, 125, 180, 30);
				contentPanel.add(choose_combo);

				// 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("Times New Roman", Font.BOLD, 15));
			   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);
			   years_text.setText(Double.toString(number_years));
			   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("Annunal Interest Rate : ");
			   rate_label.setFont(new Font("Times New Roman", Font.BOLD, 15));
			   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);
			   rate_text.setText(Double.toString(interest_rate * 100) + "%");
			   contentPanel.add(rate_text);


            //Text Area for result

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


            // 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();
                 }
            });

     			//Button Press Calculate

            btnCalculate.addActionListener(new ActionListener() {
                 public void actionPerformed(ActionEvent e) {
                  principal=getDouble(principal_text.getText());

                    {
                //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;
                }
                 }

                          interest_rate = getDouble(rate_text.getText());
                       number_years =   Integer.parseInt(years_text.getText());
                     System.out.println(interest_rate);
						  //Calculates the number of months for mortgage so as to determine the number of payments to be made
                    number_of_months = number_years * 12;

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

                    //Equation that 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



                    }


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


        }

        return contentPanel;
    }






    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) {
        System.out.println(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;
    }

      // Information for  Reset Button
         public void onButtonReset(){
           principal_text.setText("");
           result.setText("");


    }


public static void main(String[] args) {

                SwingUtilities.invokeLater(new Runnable() {

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



   }

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ASKER CERTIFIED SOLUTION

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> I understand, but I just can't get it to work. I need to override the combo like you said.

overriding the combo is messy (and then the combo stops working).
a better approach is to have the combo populate the text fileds (use a listener on the combo to do this)

Let me know if you need help implementing that, its not too hard

ASKER

objects: i would not mind the help at all in implementing a combo populate, as you suggested.

for yan: thanks, it does work when i place the variables in the text box but would like to get the combo_box to work as well...i think objects is going to help me out unless you have an idea.

thanks guys...you are a big help to my scattered brain

SOLUTION

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