Beginner: Can't convert a hello.class file into a jar file. Please Help!!!

Hi, I created a hello.java file, converted into a hello.class file by using the java 2SDk compiler. The problem is that the hello.class file is in a directory I created: C:\JavaBuilder\hello.class
I have a problem converting the hello class file into a jar file. I don't know which approach to take. I've looked at tutorials...but I keep getting more confused each time I view the tutorials on creating jar files. Please can someone help..by taking me through a step by step process. Please be explicit and do not leave or assume that I know any details because I'm a new born beginner. Thank you very much, I seriously appreciate it.

Hi!
first of all, you should use an upper-case character for the first letter of your classes...
To answer your question :
1) you must create a directory named "meta-inf" in your directory "C:\JavaBuilder"
2) then,you must create a file named "manifest.mf" in this directory
it's like a property file and it must contain this :
Main-Class: hello
(don't forget to type <enter> after "hello")
3) in the directory "C:\JavaBuilder", you can enter the following command :
"jar cvfM hello.jar meta-inf\manifest.mf hello.class"
(check jar.exe is in your path)
4) you can run your jar by the command :
"java -jar hello.jar"

Similar Messages

Beginner: Can't convert a hello.class file into a jar file: HELP PLEASE!!!

Hi, I created a hello.java file, converted into a hello.class file by using the java 2SDk compiler. The problem is that the hello.class file is in a directory I created: C:\JavaBuilder\hello.class
I have a problem converting the hello class file into a jar file. I don't know which approach to take. I've looked at tutorials...but I keep getting more confused each time I view the tutorials on creating jar files. Please can someone help..by taking me through a step by step process. Please be explicit and do not leave or assume that I know any details because I'm a new born beginner. Thank you very much, I seriously appreciate it.

Hi i did as you suggested, only with these exceptions:
jar -cvf hello.jar C:\JavaBuilder\hello.class
I did this and got the message: "adding : C:\JavaBuilder\hello.class (in=1150) (out=708) (deflated=38%)"
The problem is that when I tried to execute the jar file...by typing: " java -jar hello.jar" I received the error message: "Failed to load Main-Class Manifest attribute from hello.jar" Is there any way to correct this problem? please help, thank you.

Conversion of a .class file into a .jar file

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How Will I convert a .class file into a .jar file.
Pls answer ASAP.

You don't.
You add a .class file into a .jar file. You don't convert anything.
Read the help page for jar for details.

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Problem in include library files into my jar file

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Double post. Please post replies on the other thread.
http://forum.java.sun.com/thread.jspa?threadID=656781&tstart=0

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I would like to know if it's possible to include a rms (RecordStore) into a jar file off a Midlet suite. I don't want to create the RecordStore everytime i need to install my application. I tryed to copy rms.db to the instalation dir and it worked but i have tools that allow me to do that. My possible clients don't, and i wish to include the rms in the instalation to jar in order to be transparent to them. Adding file to *.jar doesn't work, because the file remains inside the *.jar and isn't installed in the application dir.
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MERRY CHRISTMAS

Hi
I'm not aware of any technique for directly loading an RMS via the JAR.
Instead, have you considered using a resource file and initializing the RMS from that? Or initializing from a network connection? You could also use the optional properties in the JAD for key=value pairs.
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Happy New Year

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Hi,
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Something like that, but remember you have to rebuild the entire jar file from scratch. You can't just update one file in it.

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Hi,
how do i include a open source third party jar file into an executable jar?
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Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/net/ftp/FTPClient
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[edited msg] do i need to add the classpath at execution or something of the apache commons net library?
Message was edited by:
gekkokid

When you use an executable jar the normal class path
is ignored, but you can put a classpath inside the
jar. The usual trick is to place the library jar
files in a directory inside the application directory
and direct the manifest file to it. The manifest file
live in the jar inside the META-INF directory and
it's called manifest.mf
The two heavilly used entries are Main-class: and
Class-path: lines. Class-path just has a
comma-separated list of library paths.
The jar utility has a special option to load it up.Thanks :) I created a "/lib" directory, placed in the packages in there and redirected the Class-Path: lib/commons-net-1.4.1.jar
and it works,
thank you everyone :)

Need help pulling data from an outside file into my array. Please help =)

Hi,
I need help adapting my array to read the interest rates from an outside file. Here is my code and the outside file I wrote. Please help. Oh, the array in question is on line 259, inside of my calculation() method.
Thanks...
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.io.*;
import javax.swing.JOptionPane;
public class Workshop5 extends JFrame implements ActionListener
     //declare gui components
     //declare labels
     JPanel contentPane = new JPanel();
     JPanel graphPane = new JPanel();
    JLabel instructionLabel = new JLabel();
    JLabel amountLabel = new JLabel();
     JLabel orLabel = new JLabel();
     JLabel comboBoxLabel = new JLabel();
     JLabel termLabel = new JLabel();
     JLabel rateLabel = new JLabel();
     JLabel calcLabel = new JLabel();
     JLabel paymentLabel = new JLabel();
     JLabel tableLabel = new JLabel();
     //declare font object
     Font labelFont = new Font("Tahoma", Font.PLAIN, 16);
     //declare text fields
     JTextField amountField = new JTextField(20);
     JTextField termField = new JTextField(20);
     JTextField rateField = new JTextField(20);
     JTextField paymentField= new JTextField(20);
     //declare combo box for loan selection
     JComboBox comboBox = new JComboBox();
    //declare button group and radio buttons
    ButtonGroup buttonGroup = new ButtonGroup();
    JRadioButton enterRadioButton = new JRadioButton("Enter amount, term, & rate", true);
    JRadioButton selectRadioButton = new JRadioButton("Select a preset term/rate loan", false);
     //declare button objects
     JButton clearButton = new JButton();
    JButton calcButton = new JButton();
    JButton quitButton = new JButton();
     //declare text area for amortization
     JTextArea amortTextArea = new JTextArea();
     JTextArea testTextArea = new JTextArea();
     //declare scroll bar for amortization table
     JScrollPane scrollPane = new JScrollPane(amortTextArea,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
     public Workshop5()
          instructionLabel.setText("Choose one of the following payment calculation options:");
          instructionLabel.setFont(new Font("Tahoma",Font.PLAIN,16));
          //adds both buttons to button group
          buttonGroup.add(enterRadioButton);
          buttonGroup.add(selectRadioButton);
          enterRadioButton.setFont(labelFont);
          enterRadioButton.setBackground(Color.WHITE);
          enterRadioButton.setContentAreaFilled(false);
         enterRadioButton.addActionListener(this); //adds action listener to enter radio button
          orLabel.setText("OR");
          orLabel.setFont(new Font("Tahoma",Font.BOLD,18));
          selectRadioButton.setFont(labelFont);
          selectRadioButton.setBackground(Color.WHITE);
          selectRadioButton.setContentAreaFilled(false);
          selectRadioButton.addActionListener(this); //adds action listener to select radio button
          amountLabel.setText("Enter mortgage amount");
          amountLabel.setFont(new Font("Tahoma", Font.PLAIN,16));
          amountField.requestFocusInWindow();
          termLabel.setText("Enter term length in years:");
          termLabel.setFont(new Font("Tahoma", Font.PLAIN,14));
          rateLabel.setText("Enter interest rate:");
         rateLabel.setFont(new Font("Tahoma", Font.PLAIN,14));
            comboBoxLabel.setText("Select a loan:");
         comboBoxLabel.setFont(new Font("Tahoma", Font.PLAIN,14));
         comboBox.setBackground(new Color(255,255,255));
         comboBox.setFont(new Font("Tahoma", Font.PLAIN, 14));
         comboBox.setEnabled(false);
         ComboBox();
          calcLabel.setText("Press Calculate button to determine monthly payment.");
         calcLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
         calcButton.setText("Calculate");
         calcButton.setFont(new Font("Tahoma", Font.BOLD, 14));
         calcButton.addActionListener(this);
            //define monthly payment label
         paymentLabel.setText("Monthly payment:");
         paymentLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
         //define monthly payment text field
         paymentField.setFont(new Font("Tahoma", Font.BOLD,16));
         paymentField.setBackground(new Color(255,255,255));
         paymentField.setEditable(false);
          //define clear button
          clearButton.setText("Clear");
          clearButton.setFont(new Font("Tahoma", Font.BOLD,14));
          clearButton.addActionListener(this);
          //define quit button
          quitButton.setText("Quit");
          quitButton.setFont(new Font("Tahoma", Font.BOLD,14));
          quitButton.addActionListener(this);
          tableLabel.setText("Amoritization Table");
          tableLabel.setFont(new Font("Tahoma", Font.BOLD, 16));
          graphPane.setBackground(Color.WHITE);
          //add components to content
          getContentPane().add(contentPane);
          contentPane.setLayout(null);
          addComponent(contentPane, instructionLabel, 80,10,450,26);
          addComponent(contentPane, enterRadioButton, 30,40,220,30);
          addComponent(contentPane, orLabel, 280,40,100,30);
          addComponent(contentPane, selectRadioButton, 335,40,350,30);
          addComponent(contentPane, amountLabel, 100,80,220,26);
          addComponent(contentPane, amountField, 300,80,150,26);
          addComponent(contentPane, termLabel, 15,125,200,30);
          addComponent(contentPane, termField, 195,125,125,30);
          addComponent(contentPane, rateLabel, 62,160,200,30);
          addComponent(contentPane, rateField, 195,165,125,30);
          addComponent(contentPane, comboBoxLabel, 400,125,200,26);
          addComponent(contentPane, comboBox, 400,155,150,30);
          addComponent(contentPane, calcLabel, 100,200,400,30);
          addComponent(contentPane, calcButton, 250,240,100,30);
          addComponent(contentPane, paymentLabel, 150,285,200,30);
          addComponent(contentPane, paymentField, 300,285,100,30);
          addComponent(contentPane, clearButton, 100,330,100,30);
          addComponent(contentPane, quitButton, 400,330,100,30);
          addComponent(contentPane, tableLabel, 200,370,300,26);
          addComponent(contentPane, scrollPane, 10,400,450,360);
          addComponent(contentPane, graphPane, 475,400,305,360);
          //add window listener to close window when user presses X
          addWindowListener(new WindowAdapter()
               public void windowClosing(WindowEvent e)
                    System.exit(0);
         pack();
     //method to add components
     private void addComponent(Container container, Component c, int x, int y, int width, int height)
          c.setBounds(x, y, width, height);
          container.add(c);
     //action performed method
     public void actionPerformed(ActionEvent event)
          Object source = event.getSource();
          if (source == calcButton)
               Calculate();
          if (source == clearButton)
               Clear();
          if (source == quitButton)
               Exit();
          //defines active area based on user selection of mortgage calculation method
           //if user chooses to enter the mortgage manually, combo box fields are inactive
           if (source == enterRadioButton)
                comboBox.setEnabled(false);
                termField.setEnabled(true);
             termField.setEditable(true);
             rateField.setEnabled(true);
             rateField.setEditable(true);
             amountField.setText("");
               amountField.requestFocusInWindow();
               termField.setText("");
              rateField.setText("");
              paymentField.setText("");
              amortTextArea.setText("");
          //if user chooses to select from a preset mortgage, rate and term fields are inactive
          if (source == selectRadioButton)
               comboBox.setEnabled(true);
               termField.setEnabled(false);
               termField.setEditable(false);
               rateField.setEnabled(false);
               rateField.setEditable(false);
               amountField.setText("");
               amountField.requestFocusInWindow();
               termField.setText("");
               rateField.setText("");
               paymentField.setText("");
               amortTextArea.setText("");
     }//end of action performed method
     //combo box method
      public void ComboBox()
           String[] LoanArray = {" 7 years at 5.35 %", " 15 years at 5.50 %", " 30 years at 5.75 %"};
           for (int i = 0; i < LoanArray.length; i++)
                comboBox.addItem(LoanArray);
     }//end combo box method
     //calculation method
     void Calculate()
          //resets fields
          paymentField.setText("");
     amortTextArea.setText("");
          //calculation variables
     NumberFormat currency = NumberFormat.getCurrencyInstance();
          int [] termArray = {7, 15, 30};                               //array of years
               double [] yearlyInterestArray = {5.35, 5.5, 5.75};           //array of interest
               int totalMonths = 0;                                    //total months
               double Loan = 0.0;                               //amount of loan
               double MonthlyInterest = 0.0;                               //monthly interest rate
               double Payment = 0.0;                               //calculate payment
               double monthlyPayment = 0.0;                                   //calculate monthly payment
               double Interest = 0.0;                                              //variable for Interest Array input
               int Term = 0;                                              //variable for Term Array input
               double NewMonthlyInterest = 0.0;                               //new interest amount
               double NewLoan = 0.0;                               //new loan amount
               double Reduction = 0.0;                               //principle reduction
               //validate input
               try
                    Loan = Double.parseDouble(amountField.getText());
               catch (NumberFormatException e)
                    JOptionPane.showMessageDialog(null,"Invalid Entry. Please enter valid loan amount.", "Error", JOptionPane.WARNING_MESSAGE);
               //resets input fields after error message
          amountField.setText("");
          amountField.requestFocusInWindow();
               //if select button is chosen
          if (selectRadioButton.isSelected())
               int index = comboBox.getSelectedIndex();
               Term = termArray[index];
               Interest = yearlyInterestArray[index];
          //if user chooses to enter mortgage information
          else
               if (enterRadioButton.isSelected())
                    //validates input
          try
          Term = Integer.parseInt(termField.getText());
          catch (NumberFormatException e)
               JOptionPane.showMessageDialog(null,"Invalid entry. Please enter valid term length in years.", "Error",JOptionPane.WARNING_MESSAGE);
               //clears fields after error message
               termField.setText("");
               termField.requestFocusInWindow();
          try
               Interest = Double.parseDouble(rateField.getText());
          catch (NumberFormatException e)
               JOptionPane.showMessageDialog(null,"Invalid entry. Please enter valid rate (without percent symbol).","Error",JOptionPane.WARNING_MESSAGE);
          //clears fields after error message
          rateField.setText("");
                         rateField.requestFocusInWindow();
               //perform calculations
               if (Loan > 0)
                    Loan = Double.parseDouble(amountField.getText());
                    MonthlyInterest = (Interest / 12)/100;
                    totalMonths = Term * 12;
                    monthlyPayment = Loan * MonthlyInterest *(Math.pow((1 + MonthlyInterest), totalMonths)/(Math.pow((1 + MonthlyInterest), totalMonths)-1));
          paymentField.setText("" + currency.format(monthlyPayment));
                    //send information to amortization text area
               amortTextArea.append("Number\t");
               amortTextArea.append(" Amount\t");
               amortTextArea.append("Interest\t");
               amortTextArea.append("Principle\t");
               amortTextArea.append("Balance\n");
          NewLoan = Loan;
                    for (int i = 1; i <= totalMonths; i++)
                         NewMonthlyInterest = MonthlyInterest * NewLoan;
                         Reduction = monthlyPayment - NewMonthlyInterest;
                         NewLoan = NewLoan - Reduction;
                         amortTextArea.append(" " + i +"\t");
                         amortTextArea.append(" " + currency.format(monthlyPayment) + "\t");
                         amortTextArea.append(" " + currency.format(NewMonthlyInterest)+ "\t");
                         amortTextArea.append(" " + currency.format(Reduction) + "\t");
                         amortTextArea.append(" " + currency.format(NewLoan) + "\n");
                    //resets fields if loan amount is less than zero
                    if((Loan <= 0 || Term <= 0 || Interest <= 0))
                         paymentField.setText("");
                         amortTextArea.setText("");
     }//end calcualtion method
     //clear method
     void Clear()
          amountField.setText("");
          amountField.requestFocusInWindow();
          termField.setText("");
          rateField.setText("");
          paymentField.setText("");
          amortTextArea.setText("");
     }//end of clear method
     //main method
     public static void main(String args[])
          Workshop5 f = new Workshop5();
          f.setTitle("Carol's Mortgage Calculator");
          f.setBounds(200,100,800,800);
          f.setResizable(false);
          f.setVisible(true);
     }//end of main method
     //exit method
     void Exit()
          System.exit(0);
     }//end of exit method
}//program end
My data file is called: "InterestData.dat" and only contains the following text:
5.35, 5.5, 5.75

Ok, now I am getting this error message:
cannot resolve symbol method lenght()
Please help me out here, this is due tomorrow and I've been killing myself on it...
attaching program with revised code included, see beginning of calculation method line 250:
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.* ;
import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.io.*;
import javax.swing.JOptionPane;
public class Workshop5 extends JFrame implements ActionListener
     //declare gui components
    //declare labels
    JPanel contentPane = new JPanel();
     JPanel graphPane = new JPanel();
     JLabel instructionLabel = new JLabel();
        JLabel amountLabel = new JLabel();
    JLabel orLabel = new JLabel();
    JLabel comboBoxLabel = new JLabel();
    JLabel termLabel = new JLabel();
    JLabel rateLabel = new JLabel();
    JLabel calcLabel = new JLabel();
    JLabel paymentLabel = new JLabel();
    JLabel tableLabel = new JLabel();
    //declare font object
    Font labelFont = new Font("Tahoma", Font.PLAIN, 16);
    //declare text fields
    JTextField amountField = new JTextField(20);
    JTextField termField = new JTextField(20);
    JTextField rateField = new JTextField(20);
    JTextField paymentField= new JTextField(20);
    //declare combo box for loan selection
    JComboBox comboBox = new JComboBox();
        //declare button group and radio buttons
        ButtonGroup buttonGroup = new ButtonGroup();
        JRadioButton enterRadioButton = new JRadioButton("Enter amount, term, & rate", true);
        JRadioButton selectRadioButton = new JRadioButton("Select a preset term/rate loan", false);
    //declare button objects
    JButton clearButton = new JButton();
        JButton calcButton = new JButton();
        JButton quitButton = new JButton();
    //declare text area for amortization
    JTextArea amortTextArea = new JTextArea();
    JTextArea testTextArea = new JTextArea();
    //declare scroll bar for amortization table
    JScrollPane scrollPane = new JScrollPane(amortTextArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
     public Workshop5()
         instructionLabel.setText("Choose one of the following payment calculation options:");
        instructionLabel.setFont(new Font("Tahoma",Font.PLAIN,16));
        //adds both buttons to button group
        buttonGroup.add(enterRadioButton);
        buttonGroup.add (selectRadioButton);
        enterRadioButton.setFont(labelFont);
        enterRadioButton.setBackground(Color.WHITE);
        enterRadioButton.setContentAreaFilled(false);
        enterRadioButton.addActionListener(this); //adds action listener to enter radio button
        orLabel.setText("OR");
        orLabel.setFont(new Font("Tahoma",Font.BOLD,18));
        selectRadioButton.setFont(labelFont);
        selectRadioButton.setBackground(Color.WHITE);
        selectRadioButton.setContentAreaFilled(false);
        selectRadioButton.addActionListener (this); //adds action listener to select radio button
          amountLabel.setText("Enter mortgage amount");
        amountLabel.setFont(new Font("Tahoma", Font.PLAIN,16));
        amountField.requestFocusInWindow();
        termLabel.setText("Enter term length in years:");
        termLabel.setFont(new Font("Tahoma", Font.PLAIN,14));
        rateLabel.setText("Enter interest rate:");
        rateLabel.setFont(new Font("Tahoma", Font.PLAIN,14));
        comboBoxLabel.setText("Select a loan:");
        comboBoxLabel.setFont(new Font("Tahoma", Font.PLAIN,14));
        comboBox.setBackground(new Color(255,255,255));
        comboBox.setFont(new Font("Tahoma", Font.PLAIN, 14));
        comboBox.setEnabled(false);
        ComboBox();
        calcLabel.setText("Press Calculate button to determine monthly payment.");
        calcLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
        calcButton.setText("Calculate");
        calcButton.setFont(new Font("Tahoma", Font.BOLD, 14));
        calcButton.setBackground(new Color(202,255,112));
        calcButton.addActionListener(this);
        //define monthly payment label
        paymentLabel.setText("Monthly payment:");
        paymentLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
        //define monthly payment text field
        paymentField.setFont (new Font("Tahoma", Font.BOLD,16));
        paymentField.setBackground(new Color(255,255,255));
        paymentField.setEditable(false);
          //define clear button
        clearButton.setText("Clear");
        clearButton.setFont(new Font("Tahoma", Font.BOLD,14));
        clearButton.setBackground(new Color(202,255,112));
        clearButton.addActionListener(this);
        //define quit button
        quitButton.setText("Quit");
        quitButton.setFont(new Font("Tahoma", Font.BOLD,14));
        quitButton.setBackground(new Color(202,255,112));
        quitButton.addActionListener(this);
          //define label for amortization table
        tableLabel.setText ("Amoritization Table");
          tableLabel.setFont(new Font("Tahoma", Font.BOLD, 16));
        graphPane.setBackground(Color.WHITE);
        //add components to content
        getContentPane().add(contentPane);
        contentPane.setLayout(null);
          addComponent(contentPane, instructionLabel, 80,10,450,26);
        addComponent(contentPane, enterRadioButton, 30,40,220,30);
        addComponent(contentPane, orLabel, 280,40,100,30);
        addComponent(contentPane, selectRadioButton, 335,40,350,30);
        addComponent(contentPane, amountLabel, 100,80,220,26);
        addComponent(contentPane, amountField, 300,80,150,26);
        addComponent(contentPane, termLabel, 15,125,200,30);
        addComponent(contentPane, termField, 195,125,125,30);
        addComponent(contentPane, rateLabel, 62,160,200,30);
        addComponent(contentPane, rateField, 195,165,125,30);
        addComponent(contentPane, comboBoxLabel, 400,125,200,26);
        addComponent(contentPane, comboBox, 400,155,150,30);
        addComponent(contentPane, calcLabel, 100,200,400,30);
        addComponent(contentPane, calcButton, 250,240,100,30);
        addComponent(contentPane, paymentLabel, 150,285,200,30);
        addComponent(contentPane, paymentField, 300,285,100,30);
        addComponent(contentPane, clearButton, 100,330,100,30);
        addComponent(contentPane, quitButton, 400,330,100,30);
        addComponent(contentPane, tableLabel, 200,370,300,26);
        addComponent(contentPane, scrollPane, 10,400,450,360);
        addComponent(contentPane, graphPane, 475,400,305,360);
        //add window listener to close window when user presses X
        addWindowListener(new WindowAdapter()
             public void windowClosing(WindowEvent e)
                  System.exit(0);
        pack();
       //method to add components
       private void addComponent(Container container, Component c, int x, int y, int width, int height)
               c.setBounds(x, y, width, height);
               container.add(c);
       //action performed method
       public void actionPerformed(ActionEvent event)
               Object source = event.getSource();
               if (source == calcButton)
                       Calculate();
               if (source == clearButton)
                       Clear();
               if (source == quitButton)
                       Exit();
               //defines active area based on user selection of mortgage calculation method
               //if user chooses to enter the mortgage manually, combo box fields are inactive
               if (source == enterRadioButton)
                       comboBox.setEnabled(false);
                       termField.setEnabled(true);
               termField.setEditable(true);
               rateField.setEnabled(true);
               rateField.setEditable(true);
               amountField.setText ("");
                       amountField.requestFocusInWindow();
                       termField.setText("");
                   rateField.setText("");
                   paymentField.setText ("");
                   amortTextArea.setText("");
               //if user chooses to select from a preset mortgage, rate and term fields are inactive
               if (source == selectRadioButton)
                       comboBox.setEnabled(true);
                       termField.setEnabled(false);
                       termField.setEditable(false);
                       rateField.setEnabled (false);
                       rateField.setEditable(false);
                       amountField.setText("");
                       amountField.requestFocusInWindow();
                       termField.setText ("");
                       rateField.setText("");
                       paymentField.setText("");
                       amortTextArea.setText("");
       }//end of action performed method
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        public void ComboBox()
               String[] LoanArray = {" 7 years at 5.35 %", " 15 years at 5.50 %", " 30 years at 5.75 %"};
               for (int i = 0; i < LoanArray.length; i++)
                       comboBox.addItem(LoanArray);
}//end combo box method
//calculation method
     void Calculate()
          //resets fields
          paymentField.setText("");
          amortTextArea.setText("");
          //calculation variables
          NumberFormat currency = NumberFormat.getCurrencyInstance();
          //declare input stream object
          InputStream istream;
          //create a file object to refer to the outside file
          File interestData = new File("InterestFile.dat");
          //assign instream to the new file object
          istream = new FileInputStream(interestData);
          try
               StringBuffer sb = new StringBuffer();
               BufferedReader in = new BufferedReader(new FileReader(interestData));
               String line = "";
               while((line = in.readLine()) != null)
                    sb.append(line);
               in.close();
               String fileData = sb.toString();
               String[] splitData = fileData.split(", ");
               double [] yearlyInterestArray = new double[splitData.length()];
               for(int j = 0; j < splitData.length(); j++)
                    yearlyInterestArray[j] = new Double(splitData[j]).doubleValue();
          catch (IOException e)
               JOptionPane.showMessageDialog(null, "File does not exist." + e.getMessage());
          int [] termArray = {7, 15, 30}; //array of years
          double [] yearlyInterestArray = { 5.35, 5.5, 5.75}; //array of interest
          int totalMonths = 0; //total months
          double Loan = 0.0; //amount of loan
          double MonthlyInterest = 0.0; //monthly interest rate
          double Payment = 0.0; //calculate payment
double monthlyPayment = 0.0; //calculate monthly payment
double Interest = 0.0; //variable for Interest Array input
int Term = 0; //variable for Term Array input
double NewMonthlyInterest = 0.0; //new interest amount
double NewLoan = 0.0; //new loan amount
double Reduction = 0.0; //principle reduction
//validate input
try
     Loan = Double.parseDouble(amountField.getText());
catch (NumberFormatException e)
     JOptionPane.showMessageDialog(null,"Invalid Entry. Please enter valid loan amount.", "Error", JOptionPane.WARNING_MESSAGE);
//resets input fields after error message
amountField.setText("");
amountField.requestFocusInWindow ();
          //if select button is chosen
          if (selectRadioButton.isSelected())
               int index = comboBox.getSelectedIndex ();
               Term = termArray[index];
               Interest = yearlyInterestArray[index];
          //if user chooses to enter mortgage information
          else
               if (enterRadioButton.isSelected())
          //validates input
          try
               Term = Integer.parseInt(termField.getText());
catch (NumberFormatException e)
     JOptionPane.showMessageDialog(null,"Invalid entry. Please enter valid term length in years.", "Error",JOptionPane.WARNING_MESSAGE);
     //clears fields after error message
     termField.setText("");
     termField.requestFocusInWindow();
try
     Interest = Double.parseDouble(rateField.getText());
catch (NumberFormatException e)
     JOptionPane.showMessageDialog(null,"Invalid entry. Please enter valid rate (without percent symbol).","Error",JOptionPane.WARNING_MESSAGE);
     //clears fields after error message
     rateField.setText("");
     rateField.requestFocusInWindow();
          //perform calculations
          if (Loan > 0)
               Loan = Double.parseDouble(amountField.getText ());
               MonthlyInterest = (Interest / 12)/100;
               totalMonths = Term * 12;
               monthlyPayment = Loan * MonthlyInterest *(Math.pow ((1 + MonthlyInterest), totalMonths)/(Math.pow((1 + MonthlyInterest), totalMonths)-1));
paymentField.setText("" + currency.format(monthlyPayment));
//send information to amortization text area
amortTextArea.append("Number\t");
amortTextArea.append(" Amount\t");
amortTextArea.append("Interest\t");
amortTextArea.append("Principle\t");
amortTextArea.append("Balance\n");
               NewLoan = Loan;
               for (int i = 1; i <= totalMonths; i++)
     NewMonthlyInterest = MonthlyInterest * NewLoan;
     Reduction = monthlyPayment - NewMonthlyInterest;
     NewLoan = NewLoan - Reduction;
     amortTextArea.append(" " + i +"\t");
     amortTextArea.append (" " + currency.format(monthlyPayment) + "\t");
     amortTextArea.append(" " + currency.format(NewMonthlyInterest)+ "\t");
     amortTextArea.append(" " + currency.format(Reduction) + "\t");
     amortTextArea.append(" " + currency.format(NewLoan) + "\n");
//resets fields if loan amount is less than zero
if((Loan <= 0 || Term <= 0 || Interest <= 0))
     paymentField.setText("");
     amortTextArea.setText("");
     }//end calcualtion method
//clear method
void Clear()
amountField.setText("");
amountField.requestFocusInWindow();
termField.setText("");
rateField.setText("");
paymentField.setText("");
amortTextArea.setText("");
}//end of clear method
//main method
public static void main(String args[])
Workshop5 f = new Workshop5();
f.setTitle("Carol's Mortgage Calculator");
f.setBounds(200,100,800,800);
f.setResizable(false);
f.setVisible(true);
}//end of main method
//exit method
void Exit()
System.exit(0);
}//end of exit method
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