Question

Question 6: Identify errors and correct them of the following Java program:

1.           import java.swing.*;

2.           import java.awt.;

3.           public class ToppingPanel extends Panel

4.           {

5.           public final double CREAM_CHEESE = 0.50;

6.           public final double BUTTER = 0.25;

7.           public final double PEACH_JELLY = 0.75;

8.           public final double BLUEBERRY_JAM = 0.75;

9.           private JCheckBox creamCheese;

10.     private JCheckBox butter;     

11.     private JCheckBox peachJelly;

12.     private JCheckBox blueberryJam;

13.       public ToppingPanel()

14.       {

15.       setLayout new GridLayout(4, 1));

16.       creamCheese = new JCheckBox("Cream cheese");

17.       butter = new JCheckBox("Butter");

18.       peachJelly = new JCheckBox("Peach jelly");

19.       blueberryJam = new JCheckBox("Blueberry jam");

20.       setBorder(BorderFactory.createTitledBorder("Toppings"));

21.       add(creamCheese);

22.       add(butter);

23.       add(peachJelly);

24.       add(blueberryJam);

25.       }

26.       public double getToppingCost()

27.       {

28.       double toppingCost = 0;

29.       if (creamCheese.isSelected())

30.       toppingCost += CREAM_CHEESE;

31.       if (butter.isSelected())

32.       toppingCost += BUTTER;

33.       if (peachJelly.isSelected())

34.       toppingCost += PEACH_JELLY;

35.       if (blueberryJam.isSelected())

36.       toppingCost += BLUEBERRY_JAM;

37.       return toppingCost;

38.      

39.     }

One error is already identified for you as shown below:

Line Number: 2

Error description: Missing *

Statement after correction: import java.awt.*;

Identify 5 other errors and give their Line Number, Error description and Statement after correction.

Answer 1

There are 4 more errors in the code, not 5. Total including the one you listed is 5. These are listed below in the order of line numbers.

Line Number: 1

Error description: incorrect import (java instead of javax)

Statement after correction: import javax.swing.*;

Line Number: 2

Error description: Missing *

Statement after correction: import java.awt.*;

Line Number: 3

Error description: incorrect super class name (Panel instead of JPanel)

Statement after correction: public class ToppingPanel extends JPanel

Note: Though there is a super class named Panel exist, it is from awt package, so we cannot use some swing utilities like setting border (line 20). There is no setBorder() method defined in Panel, but it’s there in JPanel.

Line Number: 15

Error description: Missing ( after setLayout

Statement after correction: setLayout(new GridLayout(4, 1));

Line Number: 38

Error description: Missing }

Statement after correction: }

After fixing all these 5 errors, the code will compile successfully with no syntax errors. Though there’s more code to be added in order to implement full functionality of the program, it cannot be called errors. Let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. If not, PLEASE let me know before you rate, I’ll help you fix whatever issues. Thanks