Question

You are to design and implement a GUI application that will calculate the price of a pizza,
based upon the size, style of crust, and selection of toppings.

The price is calculated
according to the following rules:

• A plain small pizza is $6, medium is $8, large is $10, and a partysize
is $12.

• Thick crust is $1.00 more than thin crust, regardless of size.

• Additional toppings are $0.75, $1.25, $1.75, and $2.25 each for small, medium,
large, and partysize
pizzas, respectively.

I recommend using radio buttons for the choice of size and crust, and check boxes for the
selection of toppings. There should be at least six different toppings available.

Program:

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

public class PizzaCalculator extends JFrame implements ActionListener {
    JPanel westPanel = new JPanel();
    JPanel eastPanel = new JPanel();
    JPanel centerPanel = new JPanel();
    JPanel northPanel = new JPanel();
    JPanel southPanel = new JPanel();

    // pizza size options
    JRadioButton Small = new JRadioButton("Small");
    JRadioButton Medium = new JRadioButton("Medium");
    JRadioButton Large = new JRadioButton("Large");
    JRadioButton Party = new JRadioButton("Party");

    // pizza crust choices
    JRadioButton Thin = new JRadioButton("Thin");
    JRadioButton Thick = new JRadioButton("Thick");

    // pizza topping selections
    JCheckBox Cheese = new JCheckBox("Cheese");
    JCheckBox Pepperoni = new JCheckBox("Pepperoni");
    JCheckBox Sausage = new JCheckBox("Sausage");
    JCheckBox Ham = new JCheckBox("Ham");
    JCheckBox Pinapple = new JCheckBox("Pinapple");
    JCheckBox BlackOlives = new JCheckBox("Black Olives");

    // calculate, clear, and total buttons
    JButton Calculate = new JButton("Calculate");
    JButton Clear = new JButton("Clear");
    JLabel Total = new JLabel("Total: ");
    JTextField TotalResult = new JTextField(8);

    // variables used to calculate total
    int TopQty = 0;
    double Size = 0;
    double TopCost = 0;
    double CrustCost = 0;
    double TotalCost = 0;

    public PizzaCalculator() {
        // layout north portion of frame
        northPanel.setLayout(new GridLayout(2, 3));
        northPanel.setBorder(new TitledBorder("Pizza Size and Crust Type:"));

        // register listeners with buttons
        Small.addActionListener(this);
        Medium.addActionListener(this);
        Large.addActionListener(this);
        Party.addActionListener(this);
        Calculate.addActionListener(this);

        ButtonGroup pizzaSize = new ButtonGroup();
        pizzaSize.add(Small);
        pizzaSize.add(Medium);
        pizzaSize.add(Large);
        pizzaSize.add(Party);

        ButtonGroup pizzaCrust = new ButtonGroup();
        pizzaCrust.add(Thin);
        pizzaCrust.add(Thick);

        // add buttons to north panel
        northPanel.add(new JTextField("Pizza Total Calculator"));
        northPanel.add(Small);
        northPanel.add(Medium);
        northPanel.add(Large);
        northPanel.add(Party);
        northPanel.add(Thin);
        northPanel.add(Thick);

        centerPanel.setLayout(new GridLayout(5, 5));
        centerPanel.setBorder(new TitledBorder("Toppings:"));

        centerPanel.add(Cheese);
        centerPanel.add(Pepperoni);
        centerPanel.add(Sausage);
        centerPanel.add(Ham);
        centerPanel.add(Pinapple);
        centerPanel.add(BlackOlives);

        southPanel.add(Calculate);
        southPanel.add(Clear);
        southPanel.add(Total);
        southPanel.add(TotalResult);

        // add all portions of panel
        setLayout(new BorderLayout(5, 5));
        add(northPanel, BorderLayout.NORTH);
        add(centerPanel, BorderLayout.CENTER);
        add(southPanel, BorderLayout.SOUTH);
    }

    // handle action event for each pizza option
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == Small)
            setSizeS();
        else if (e.getSource() == Medium)
            setSizeM();
        else if (e.getSource() == Large)
            setSizeL();
        else if (e.getSource() == Party)
            setSizeP();

        if (e.getSource() == Thin)
            setCrustThin();
        else if (e.getSource() == Thick)
            setCrustThick();

        if (e.getSource() == Cheese)
            TopQty++;
        else if (e.getSource() == Pepperoni)
            TopQty++;
        else if (e.getSource() == Sausage)
            TopQty++;
        else if (e.getSource() == Ham)
            TopQty++;
        else if (e.getSource() == Pinapple)
            TopQty++;
        else if (e.getSource() == BlackOlives)
            TopQty++;

        TopCost(TopQty);

        if (e.getSource() == Calculate)
            calculate(Size, TopCost, CrustCost);
    }

    public double setSizeS() {
        return Size = 6.00;
    }

    public double setSizeM() {
        return Size = 8.00;
    }

    public double setSizeL() {
        return Size = 10.00;
    }

    public double setSizeP() {
        return Size = 12.00;
    }

    public double setCrustThin() {
        return CrustCost = 0.00;
    }

    public double setCrustThick() {
        return CrustCost = 1.00;
    }

    public double TopCost(int TopQty) {

        if (e.getSource() == Small)
            if (TopQty == 1)
                TopCost = 0.75;
            else if (TopQty == 2)
                TopCost = 2 * (0.75);
            else if (TopQty == 3)
                TopCost = 3 * (0.75);
            else if (TopQty == 4)
                TopCost = 4 * (0.75);
            else if (TopQty == 5)
                TopCost = 5 * (0.75);
            else if (TopQty == 6)
                TopCost = 6 * (0.75);
            else if (e.getSource() == Medium)
                if (TopQty == 1)
                    TopCost = 1.25;
                else if (TopQty == 2)
                    TopCost = 2 * (1.25);
                else if (TopQty == 3)
                    TopCost = 3 * (1.25);
                else if (TopQty == 4)
                    TopCost = 4 * (1.25);
                else if (TopQty == 5)
                    TopCost = 5 * (1.25);
                else if (TopQty == 6)
                    TopCost = 6 * (1.25);
                else if (e.getSource() == Large)
                    if (TopQty == 1)
                        TopCost = 1.75;
                    else if (TopQty == 2)
                        TopCost = 2 * (1.75);
                    else if (TopQty == 3)
                        TopCost = 3 * (1.75);
                    else if (TopQty == 4)
                        TopCost = 4 * (1.75);
                    else if (TopQty == 5)
                        TopCost = 5 * (1.75);
                    else if (TopQty == 6)
                        TopCost = 6 * (1.75);
                    else if (e.getSource() == Party)
                        if (TopQty == 1)
                            TopCost = 2.25;
                        else if (TopQty == 2)
                            TopCost = 2 * (2.25);
                        else if (TopQty == 3)
                            TopCost = 3 * (2.25);
                        else if (TopQty == 4)
                            TopCost = 4 * (2.25);
                        else if (TopQty == 5)
                            TopCost = 5 * (2.25);
                        else if (TopQty == 6)
                            TopCost = 6 * (2.25);

        return TopCost;

    }

    public void calculate(double Size, double TopCost, double CrustCost) {
        TotalCost = Size + TopCost + CrustCost;
        TotalResult.setText(String.valueOf(TotalCost));
    }

    public static void main(String[] args) {
        PizzaCalculator PizzaCalc = new PizzaCalculator();
        // set window title
        PizzaCalc.setTitle("Pizza Cost Calculator");
        // set window location
        PizzaCalc.setLocationRelativeTo(null);
        // specify window location
        PizzaCalc.setDefaultCloseOperation(JFrame.EXIT_ON_ClOSE);
        // set window size
        PizzaCalc.setSize(800, 250);
        // display window
        PizzaCalc.setVisible(true);
    }
}

Error:

----jGRASP exec: javac -g PizzaCalculator.java

PizzaCalculator.java:166: error: cannot find symbol
if(e.getSource() == Small)
^
symbol: variable e
location: class PizzaCalculator
PizzaCalculator.java:179: error: cannot find symbol
else if(e.getSource() == Medium)
^
symbol: variable e
location: class PizzaCalculator
PizzaCalculator.java:192: error: cannot find symbol
else if(e.getSource() == Large)
^
symbol: variable e
location: class PizzaCalculator
PizzaCalculator.java:205: error: cannot find symbol
else if(e.getSource() == Party)
^
symbol: variable e
location: class PizzaCalculator
PizzaCalculator.java:237: error: cannot find symbol
PizzaCalc.setDefaultCloseOperation(JFrame.EXIT_ON_ClOSE );
^
symbol: variable EXIT_ON_ClOSE
location: class JFrame
errors

----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.

e.getSource() is something you expect in an actionPerformed method which's ActionEvent parameter is called e.

In the method you try to call 'e.getSource()' you don't have an e variable. either you put that code in your actionperformed, or you add an ActionEvent called e as parameter.

But, since this wouldn't make much sense here, how about:

if ( Small.isSelected())
... instead?

and your question? Just dumping something here that's clearly your homework assigment and expecting us to complete it for you is not going to help.
It's also clearly not allowed.