Creating a JAR executable

Question

I made a simple calculator in java and I want to zip it up in an excutable jar file. I have 3 classes including my main in my .java file and am having trouble creating the jar archive. The source code for this program is:
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import javax.swing.*;
// Frame for button panel
class CalculatorFrame extends JFrame
     public CalculatorFrame()
          Toolkit kit = Toolkit.getDefaultToolkit();
          // sets title & icon image for window
          setTitle("Java Calculator v1.0 by D. Burkland");
          Image img = kit.getImage("calc.gif");
          setIconImage(img);     
          // add panel to frame
          CalculatorPanel calculator = new CalculatorPanel();
          add(calculator);
          pack();
          // centers frame
          Dimension screenSize = kit.getScreenSize();
          int screenHeight = screenSize.height;
          int screenWidth = screenSize.width;
          // center & set dimensions of frame
          setSize(width, height);
          setLocation(screenWidth / 3, screenHeight / 3);
          // set file chooser
          chooser = new JFileChooser();
          chooser.setCurrentDirectory(new File("."));
          // set up menu bar
          JMenuBar menuBar = new JMenuBar();
          setJMenuBar(menuBar);
          JMenu filemenu = new JMenu("File");
          JMenu helpmenu = new JMenu("Help");
          menuBar.add(filemenu);
          menuBar.add(helpmenu);
          // action of the exit text
          JMenuItem exitItem = new JMenuItem("Exit");
          filemenu.add(exitItem);
          exitItem.addActionListener(new
                    ActionListener()
                         public void actionPerformed(ActionEvent event)
                              System.exit(0);
          JMenuItem helpItem = new JMenuItem("About");
          helpmenu.add(helpItem);
          helpItem.addActionListener(new
                    ActionListener()
                         public void actionPerformed(ActionEvent event)
                              JOptionPane.showMessageDialog(null, "Java Calculator By: D. Burkland Summer 2006");               
     public static final int width = 350;
     public static final int height = 200;
     private JFileChooser chooser;
// Calculator panel
class CalculatorPanel extends JPanel
     public CalculatorPanel()
          setLayout(new BorderLayout());
          result = 0;
          lastCommand = "=";
          start = true;
          // add the display
          display = new JButton("Hello");
          display.setEnabled(false);
          add(display, BorderLayout.NORTH);
          ActionListener insert = new InsertAction();
          ActionListener command = new CommandAction();
          // adds the buttons in a 4 x 4 grid
          calculator = new JPanel();
          calculator.setLayout(new GridLayout(4, 4));
          addButton("7", insert);
          addButton("8", insert);
          addButton("9", insert);
          addButton("/", command);
          addButton("4", insert);
          addButton("5", insert);
          addButton("6", insert);
          addButton("*", command);
          addButton("1", insert);
          addButton("2", insert);
          addButton("3", insert);
          addButton("-", command);
          addButton("0", insert);
          addButton(".", insert);
          addButton("=", command);
          addButton("+", command);
          add(calculator, BorderLayout.CENTER);
     Adds a button to the center panel
     @param lable the button label
     @param listener the button listener
     private void addButton(String label, ActionListener listener)
          JButton button = new JButton(label);
          button.addActionListener(listener);
          calculator.add(button);
     // Inserts the button action string to the end of the display
     private class InsertAction implements ActionListener
          public void actionPerformed(ActionEvent event)
               String input = event.getActionCommand();
               if (start)
                    display.setText("");
                    start = false;
               display.setText(display.getText() + input);
     // Executes the command that the button action string demotes
     private class CommandAction implements ActionListener
          public void actionPerformed(ActionEvent event)
               String command = event.getActionCommand();
               if (start)
                    if (command.equals("-"))
                         display.setText(command);
                         start = false;
                    else
                         lastCommand = command;
               else
                    calculate(Double.parseDouble(display.getText()));
                    lastCommand = command;
                    start = true;
     // Carries out the pending calculation
     public void calculate(double x)
          if (lastCommand.equals("+")) result += x;
          else if (lastCommand.equals("-")) result -= x;
          else if (lastCommand.equals("*")) result *= x;
          else if (lastCommand.equals("/")) result /= x;
          else if (lastCommand.equals("=")) result = x;
          display.setText("" + result);
     private JButton display;
     private JPanel calculator;
     private double result;
     private String lastCommand;
     private boolean start;
public class Calculator
     public static void main(String[] args)
          CalculatorFrame calculator = new CalculatorFrame();
          calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          calculator.setVisible(true);
}I am using Eclipse to create the jar files so if anybody has any advice I would be very grateful if you shared it.
Thanks,
Danny

Answer 1

Well I keep getting errors so I am doing something wrong. The errors I get are:
java.io.FileNotFoundException: jarexample.jar (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:
106)
java.io.FileInputStream.<init>(FileInputStream.java:66)
at sun.tools.jar.Main.run(Main.java:122)
at sun.tools.jar.Main.main(Main.java:903)So I have 3 classes, but after compiling the program I have many .class files: Calculator.class, CalculatorFrame$1.class, CalculatorFrame$2.class, CalculatorFrame.class, CalculatorPanel$CommandAction.class, CalculatorPanel$InsertAction.class, and CalculatorPanel.class. Which files do I want to export into my jar file and do I have to open these class files in Eclipse? Also could you explain the manifest thing first, I have googled for this stuff but get confused because of the class file issue that I previously stated.
Thanks again for helping a noobie out :)
Message was edited by:
danny9894
Message was edited by:
danny9894