java program

Outcomes

▪ Write programs that use object oriented programming concepts.

▪ Write programs that use objects.

Scoring

▪ If you do not submit a .zip file containing your source code, your score will be

zero.

▪ If you submit source code that does not compile, your score will be zero.

▪ If you submit source code without the correct class name(s) or the correct

method names (see below), your score will be decreased by 50 points.

▪ In addition, deductions will be made for not meeting the following

requirements:

o At the beginning of each java file, add a comment with the following information:

▪ Student’s name

▪ Course/section,

▪ Date

▪ Filename

▪ Description of the program/class o Indentation guidelines:

▪ The code inside of a class must be indented with respect to the class

definition.

▪ The code inside of a method must be indented with respect to the method

definition.

▪ The code inside of if / else / else if / while / for / do-while structures must be

indented with respect to its corresponding structure.

▪ Curly braces can be positioned at the end of the corresponding structure

definition, or in the following lines aligned with the corresponding structure. o

Comments:

▪ At least, one-line comment should be added per method or constructor.

▪ Comments must describe the functionality or objective of the method.

▪ Please add more comments about your code, if you think that will help the

grader.

Rubric

Full credit Partial credit

Implement and test class

Circle

(30 points)

You implements the class Circle and

your

code obtains the correct

output with the provided test class.

You implements the

class Circle and your

code obtains the correct

output with the

provided test class, but

with some errors.

Implement the class Bug

(15 points)

You implements the class Bug. You implements the

class Bug, but with some

errors.

Implement the class BugTest

(15 points)

You implements the class BugTest. You implements the

class BugTest, but with

some errors.

Implement the class

ComboLock

(15 points)

You implements the class

ComboLock.

You implements the

class ComboLock, but

with some errors.

Implement the class

ComboLockTest

(15 points)
You implements the class

ComboLockTest.

You implements the

class ComboLockTest,

but with some errors.

Make sure the user does not

enter bad values

(10 points)

You make sure the user only

enters a valid menu options and

values.

You check for bad user

entry, but with some

errors.

Description

For this assignment, you will build three applications: CircleSolution, BugSolution, and

ComboLockSolution.

CircleSolution

1. Create a folder named CircleSolution to store the classes for this application.

2. Create the class Circle.

Circle

radius: double

circumference: double area:

double

calculateCircumference():void

calculateArea():void

3. All the data fields are private.

4. calculateCircumference and calculateArea are private methods.

5. Create a no-argument constructor for the class.
public Circle() {
}

6. Add another constructor which receives a double value to initialize the radius of the object (if

the double value is a negative value, the value of zero will be assigned to this.radius) and calls

the methods calculateCircumference and calculateArea.

7. Create a setter and a getter for the data field radius.

8. The setter for radius will check if the received double value is greater than or equal to zero. If it

is, the radius will be updated, and circumference and area will be recalculated by calling the

corresponding methods. Otherwise, the value of radius will not be updated.

9. circumference and area will be read-only members. Therefore, only create a getter for

circumference and another for area.

10. Complete the method calculateCircumference.

11. Complete the method calculateArea.

12. Download the file CircleTest.java and add it to the folder CircleSolution.

13. Compile and execute it.

14. The class Circle have to interact with CircleTest to provide the expected output.

BugSolution

1. Create a folder named BugSolution to store the classes for this application.

2. Implement the class Bug described in the programming exercise P8.12 in your book.

3. All the data fields of the class Bug are private.

4. The methods described in the programming exercise are public.

5. In addition, create a getter to obtain the current direction of the bug.

6. Other private methods can be created, if needed.

7. Create an application named BugTest, which will have the following behavior.

a. It starts by showing the application name and asking the user for the initial position of

the bug. The text in red represents the user input.
== Bug Solution ==
Enter the initial position of the bug: 7

b. The application creates an object Bug with the user input as the initial position, and sets

the direction to the right.

c. Then, it

presents the

status of the

bug: current

position and

direction:

Position: 7 Direction: right d.

Also, it presents a menu with three options.

– Menu –

Name Radius Circumference Area

Circle 1 5.00

31.42 78.54

Circle 2 11.00 69.12 380.13

Circle 3 19.00 119.38 1134.11

1. Change

direction.

2. Move.
3. Exit.
Enter your choice: 1

e. If the user chooses option 1, the direction is changed.

f. If the user chooses option 2, the bug changes its position by one unit in the current

direction.

g. After option 1 or option 2 are chosen, the status of the bug and the menu is presented

again.

h. If the user chooses option 3, the program ends.

Sample run

== Bug Solution ==
Enter the initial position for the bug: 7
Position: 7 Direction: right

– Menu –
1. Change direction.
2. Move.
3. Exit.
Enter your choice: 2

Position: 8 Direction: right

– Menu –
1. Change direction.
2. Move.
3. Exit.
Enter your choice: 2

Position: 9 Direction: right

– Menu –
1. Change direction.
2. Move.
3. Exit.
Enter your choice: 4

*** Invalid option!

Position: 9 Direction: right

– Menu –
1. Change direction.
2. Move.
3. Exit.
Enter your choice: 1

Position: 9 Direction: left

– Menu –
1. Change direction.
2. Move.
3. Exit.
Enter your choice: 2

Position: 8 Direction: left

– Menu –
1. Change direction.
2. Move.
3. Exit.
Enter your choice: 3

ComboLockSolution

1. Create a folder named ComboLockSolution to store the classes for this application.

2. Implement the class ComboLock described in programming exercise P8.9 in your book.

3. All the data fields of the class ComboLock are private.

4. The methods described in the programming exercise are public.

5. Other private methods can be created, if needed.

6. Create an application named ComboLockTest, which will have the following behavior.

a. In the main method, create an object ComboLock with a hard-coded combination.

b. The program shows the application name and menu. The text in red represents the user

input.

== ComboLock Solution ==
– Menu –
1. Open Lock.
2. Exit.
Enter your choice: 1

c. If the user chooses option 1,

i. Ask the user for the first number, then call turnRight with the provided

number.

ii. Ask the user for the second number, then call turnLeft with the provided

number. iii. Ask the user for the third number, then call turnRight with the

provided number.

iv. Call the method open, and show whether the user could open the lock.

v. Finally, return to the menu.

d. If user chooses option 2, the program ends.

Sample run
== ComboLock Solution ==
– Menu –
1. Open Lock.
2. Exit.
Enter your choice: 1

Enter the first number: 10

Turning to the right.

Enter the second number:

50

*** Invalid value!

Enter the second number: 22
Turning to the left.
Enter the third number: 7

Turning to the right.
The combination is incorrect. The lock is closed.
– Menu –
1. Open Lock.
2. Exit.
Enter your choice: 1

Enter the first number: 11

Turning to the right.
Enter the second number: 9
Turning to the left.
Enter the third number: 7

Turning to the right.
The combination is correct. The lock is open.

– Menu –
1. Open Lock.
2. Exit.
Enter your choice: 3

*** Invalid option!

– Menu –
1. Open Lock.
2. Exit.
Enter your choice: 2

Other requirements

▪ For the ComboLock solution, the program needs to validate the option selection in the menu

and the values of each number of the combination.

▪ For the BugSolution, the program needs to validate the option selection in the menu.

▪ Compress the application folders into a zip file named Homework02.zip and submit it to the

corresponding assignment in Canvas.