ActionListener Errors

Question

i'm having a lot of problems with this file but the thing i need help most is starts
at Help in the code to the end of the file
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.DecimalFormat;
public class JenesisShoppingGameWindow extends JFrame
     private ProductCheckBoxPanel productPanel;
     private GreetingPanel greet;
     private ExtraItemsPanel extrasPanel;
     private Container contentPane;
     private JPanel buttonPanel;
     private JButton calcButton;
     private JButton exitButton;
     private final double TAX_RATE = 0.06;
     public JenesisShoppingGameWindow()
          super("Jenesis Shopping Game");
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          contentPane = getContentPane();
          contentPane.setLayout(new BorderLayout());
          productPanel = new ProductCheckBoxPanel();
          extrasPanel = new ExtraItemsPanel();
          greet = new GreetingPanel();
          buildButtonPanel();
          contentPane.add(productPanel, BorderLayout.CENTER);
          contentPane.add(extrasPanel, BorderLayout.EAST);
          contentPane.add(greet, BorderLayout.NORTH);
          contentPane.add(buttonPanel, BorderLayout.SOUTH);
          pack();
          setVisible(true);
     public void buildButtonPanel()
          buttonPanel = new JPanel();
          calcButton = new JButton("Calculate");
          exitButton = new JButton("Exit");
          calcButton.addActionListener(
               new CalcButtonListener());
          exitButton.addActionListener(
               new ExitButtonListener());
          buttonPanel.add(calcButton);
          buttonPanel.add(exitButton);
help
     private class CalcButtonListener implements ActionListener
          public void actionPerformed (ActionEvent e)
               double subtotal;
               double total;
               double tax;
               DecimalFormat money;
               money = new DecimalFormat("#,##0.00");
               subtotal = productPanel.getProductCost() +
                    extraItemsPanel.getNonRoutineCost();
               tax = extraItemsPanel.lottoMean * TAX_RATE;
               total = subtotal + tax;
               JOptionPane.showMessageDialog(null,
                    "Subtotal: $" + money.format(subtotal)+
                    "\nTax: $" + money.format(tax)+
                    "\nTotal: $" + money.format(total));
     private class ExitButtonListener implements ActionListener
          public void actionPerformed(ActionEvent e)
               System.exit(0);
}and i get these errors
JenesisShoppingGameWindow.java:49: interface expected here
     private class CalcButtonListener implements ActionListener
^
JenesisShoppingGameWindow.java:70: interface expected here
     private class ExitButtonListener implements ActionListener
^
JenesisShoppingGameWindow.java:42: addActionListener(java.awt.event.ActionListener) in javax.swing.AbstractButton cannot be applied to (JenesisShoppingGameWindow.CalcButtonListener)
          calcButton.addActionListener(
^
JenesisShoppingGameWindow.java:44: addActionListener(java.awt.event.ActionListener) in javax.swing.AbstractButton cannot be applied to (JenesisShoppingGameWindow.ExitButtonListener)
          exitButton.addActionListener(
^
JenesisShoppingGameWindow.java:61: cannot find symbol
symbol : variable extraItemsPanel
location: class JenesisShoppingGameWindow.CalcButtonListener
                    extraItemsPanel.getNonRoutineCost();
^
JenesisShoppingGameWindow.java:60: operator + cannot be applied to double,extraItemsPanel.getNonRoutineCost
               subtotal = productPanel.getProductCost() +
^
JenesisShoppingGameWindow.java:60: incompatible types
found : <nulltype>
required: double
               subtotal = productPanel.getProductCost() +
^
all i really need help with though is the actionlistener stuff

Answer 1

i fixed these problems but ran into a new one not related to this topic
how do i get something from a different method
example
     public double getNonRoutineCost()
          double totalCost = 0.0;
          String str1;
          String str2;
          double extraCost;
          double lottoCost;
          double lottom;
          str1 = extraStuff.getText();
          extraCost = Double.parseDouble(str1);
          str2 = lotto.getText();
          lottoCost = Double.parseDouble(str2);
          lottom = lottoCost * LOTTO_RATE;
          totalCost = (extraCost * EXTRA_RATE) + (lottoCost * LOTTO_RATE);
          return totalCost;
     public double getLottoMean()
          double lottoMean;
          lottoMean = ;
          return lottoMean;
     } how do i get lottoMean in getLottoMean() to equal lottom in getNonRoutineCost()?