Help with Postfix Calculator in netbeans

[b3222]

hello, i have to do an assignment with a postfix calculator but dont know where to start or how to get it working. can any1 help? heres what we got.

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package calculator;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

/**
 *
 * @author itmpm
 */

// No Number exception for when you try to retrieve a number that isn't there

class NoNumberException extends Exception {
    public NoNumberException() {
        super("There is currently no number");
    }
}


/*
 * NumberButton -- extends a JButton so it has a digital value.
 */
class NumberButton extends JButton {
    double value;

// Constructor -- initialize value
    public NumberButton(int n) {
        super(Integer.toString(n));
        value = n;
    }

// getValue -- return the value
        public double getValue() {
            return value;
        }
}

/*
 * Helper class to build a number
 */
class NumberBuilder {
   // This is where you add methods and other members to build a number,
   // digit by digit.
}


abstract class Sizer {
    public static void setSize(JButton victim) {
//        victim.setPreferredSize(new Dimension(29,29));
        victim.setPreferredSize(new Dimension(60,45));
        victim.setMinimumSize(new Dimension(15,15));
        victim.setMaximumSize(new Dimension(70,70));
        victim.setFont(new Font("LucidaGrande", Font.PLAIN, 18));
    }
}


public class Calculator extends JFrame implements ActionListener {

    NumberBuilder myNum = new NumberBuilder();
    JLabel Display;
    NumberButton NumberButtons[];
    JButton ClearButton, ClearAllButton;
    JButton AddButton, SubtractButton, MultiplyButton,
            DivideButton, EnterButton;
    JButton ChangeSignButton, FactorialButton, PowerButton, DecimalButton;
    JLabel StackLabel, EquationLabel, MessageLabel;

    // Use the status bar for either the stack or the equation;
    // comment out the one you don't want.
    final String EquationPrefix = new String("Equation: ");
    final String StackPrefix = new String("Stack: ");
    final String MessagePrefix = new String(" ");
    
    
    // Constructor
    public Calculator () {
        
        // Initialize Frame
        Container container = getContentPane();
        container.setLayout(new BorderLayout());
        
        Display = new JLabel();
        Display.setText(" ");
        Font curFont = Display.getFont();
        Display.setFont(new Font(curFont.getFontName(), curFont.getStyle(), 16));
//        System.out.println("Font is "+curFont.getFontName());
        Display.setBorder(BorderFactory.createLineBorder(Color.black));
        Display.setAlignmentY(RIGHT_ALIGNMENT);
        container.add(Display, BorderLayout.NORTH);

        NumberButtons = new NumberButton[10];
        
        
        // Populate NumberButtons array
        for (char i=0; (i<=9); i++) {
            NumberButtons[i] = new NumberButton(i);
            NumberButtons[i].addActionListener(this);
            Sizer.setSize(NumberButtons[i]);
        }
        
        // Initialize clear buttons
        ClearButton = new JButton("C");
        ClearButton.addActionListener(this);
        Sizer.setSize(ClearButton);
        ClearAllButton = new JButton("CA");
        ClearAllButton.addActionListener(this);
        Sizer.setSize(ClearAllButton);

        // Operator buttons
        AddButton = new JButton("+");
        AddButton.addActionListener(this);
        Sizer.setSize(AddButton);
        SubtractButton = new JButton("-");
        SubtractButton.addActionListener(this);
        Sizer.setSize(SubtractButton);
        MultiplyButton = new JButton("*");
        MultiplyButton.addActionListener(this);
        Sizer.setSize(MultiplyButton);
        DivideButton = new JButton("/");
        DivideButton.addActionListener(this);
        Sizer.setSize(DivideButton);
        EnterButton = new JButton("E");
        EnterButton.addActionListener(this);
        Sizer.setSize(EnterButton);
        ChangeSignButton = new JButton("+/-");
        ChangeSignButton.addActionListener(this);
        Sizer.setSize(ChangeSignButton);
        FactorialButton = new JButton("!");
        FactorialButton.addActionListener(this);
        Sizer.setSize(FactorialButton);
        PowerButton = new JButton("^");
        PowerButton.addActionListener(this);
        Sizer.setSize(PowerButton);
        DecimalButton = new JButton(".");
        DecimalButton.addActionListener(this);
        Sizer.setSize(DecimalButton);
        

        // create Buttons panel
        JPanel Buttons = new JPanel();
        Buttons.setLayout(new GridLayout(3,7));

        Buttons.add(NumberButtons[7]);
        Buttons.add(NumberButtons[8]);
        Buttons.add(NumberButtons[9]);
        Buttons.add(MultiplyButton);
        Buttons.add(DivideButton);
        Buttons.add(ClearButton);
        Buttons.add(ClearAllButton);
        Buttons.add(NumberButtons[4]);
        Buttons.add(NumberButtons[5]);
        Buttons.add(NumberButtons[6]);
        Buttons.add(AddButton);
        Buttons.add(SubtractButton);
        Buttons.add(FactorialButton);
        Buttons.add(PowerButton);
        Buttons.add(NumberButtons[1]);
        Buttons.add(NumberButtons[2]);
        Buttons.add(NumberButtons[3]);
        Buttons.add(NumberButtons[0]);
        Buttons.add(DecimalButton);
        Buttons.add(ChangeSignButton);
        Buttons.add(EnterButton);
        

        container.add(Buttons, BorderLayout.CENTER);

        //Now, add the status bar
                //Create a status bar for y'all
        JPanel StatusBar = new JPanel(new GridLayout(3,1));
        //Set the borders of the items in the status bar
        Border loweredBevel = BorderFactory.createLoweredBevelBorder();

        //Add the status bar
        //Again, feel free to comment out any labels you don't need
        StackLabel = new JLabel(StackPrefix, SwingConstants.LEFT);
        StackLabel.setBorder(loweredBevel);
        EquationLabel = new JLabel(EquationPrefix, SwingConstants.LEFT);
        EquationLabel.setBorder(loweredBevel);
        MessageLabel = new JLabel(MessagePrefix, SwingConstants.LEFT);
        MessageLabel.setBorder(loweredBevel);
        StatusBar.add(StackLabel);
        StatusBar.add(EquationLabel);
        StatusBar.add(MessageLabel);
        container.add(StatusBar, BorderLayout.SOUTH);



        // Display that sukka
        pack();
        setTitle("Postfix Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//        setSize(250, 350);

        // Get the dimension of the screen
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

        int x = (screenSize.width - getWidth())/2;
        int y = (screenSize.height - getHeight())/2;

        setLocation(x, y);
    }

   public void actionPerformed(ActionEvent ae) {
        try {
            if (ae.getSource() == NumberButtons[0]) {
                JOptionPane.showMessageDialog(this,
                    "0");
           }
            else if (ae.getSource() == NumberButtons[1]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 1 to the number.\n"
                    + "(please, remove this dialog box!)");
           }
            else if (ae.getSource() == NumberButtons[2]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 2 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == NumberButtons[3]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 3 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == NumberButtons[4]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 4 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == NumberButtons[5]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 5 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == NumberButtons[6]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 6 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == NumberButtons[7]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 7 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == NumberButtons[8]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 8 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == NumberButtons[9]) {
                JOptionPane.showMessageDialog(this,
                    "Add a 9 to the number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == DecimalButton) {
                JOptionPane.showMessageDialog(this,
                    "This enters a decimal point.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == ClearButton) {
                JOptionPane.showMessageDialog(this,
                    "This clears the current number being entered.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == ClearAllButton) {
                JOptionPane.showMessageDialog(this,
                    "This clears the current number being entered,\n"
                    + "and should also clear your stack.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == EnterButton) {
                    JOptionPane.showMessageDialog(this,
                        "This clears the current number being entered,\n"
                        + "and pushes it onto the stack.\n"
                        + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == AddButton) {
                JOptionPane.showMessageDialog(this,
                    "Add the top two numbers on the stack.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == SubtractButton) {
                JOptionPane.showMessageDialog(this,
                    "Subtract the top two numbers on the stack.\n"
                    + "(please, remove this dialog box!)");

            }
            else if (ae.getSource() == MultiplyButton) {
                JOptionPane.showMessageDialog(this,
                    "Multiply the top two numbers on the stack.\n"
                    + "(please, remove this dialog box!)");

            }
            else if (ae.getSource() == DivideButton) {
                JOptionPane.showMessageDialog(this,
                    "Divide the top two numbers on the stack.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == ChangeSignButton) {
                JOptionPane.showMessageDialog(this,
                    "Change the sign of the current number.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == FactorialButton) {
                JOptionPane.showMessageDialog(this,
                    "calculate the factorial of the number on top of the stack.\n"
                    + "(please, remove this dialog box!)");
            }
            else if (ae.getSource() == PowerButton) {
                JOptionPane.showMessageDialog(this,
                    "Calculate powers, using the number on top of the stack\n"
                    + "as the exponent, and the next one down as the .\n"
                    + "(please, remove this dialog box!)");
            }
        }
        catch (Exception e) {
                JOptionPane.showMessageDialog(this,
                    e.getMessage());

        }
    }
}

need to know how to make buttons work properly and do calculations. anyhelp would be appriciated.

[DarrylBurke]

need to know how to make buttons work properly and do calculations. anyhelp would be appriciated.

Trail: Creating a GUI With JFC/Swing (The Java™ Tutorials)
How to Use Buttons, Check Boxes, and Radio Buttons (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)
Lesson: Writing Event Listeners (The Java™ Tutorials > Creating a GUI With JFC/Swing)

db

[DarrylBurke]

Don't double post the same topic. The other thread you started has been closed.

Also note that this is a forum, not a homework service. Ask a smart question and you'll get all the help you need; ask someone to earn your grade for you and you'll get nothing but derision.

db

[b3222]

well its not my fault ur last advice was shit

[ozzyman]

well its not my fault ur last advice was shit

Well its not his fault your question was shit.

dont know where to start or how to get it working. can any1 help?

At least he made an effort to find you links on the topics which he thought you need to learn to help you.

Make an effort, ask a real question, and you may get some real advice.

[DarrylBurke]

well its not my fault ur last advice was shit

You'll need more luck that anyone can reasonably hope for to get help on this or any other forum with that attitude.

db

[DarrylBurke]

heres what we got.

The code appears to have been copied verbatim, author and all, from
http://zhidao.baidu.com/question/143631506
http://wenwen.soso.com/z/QzoneQuestion.e?sp=186160505

db