Description
Maximum points: 20 pts
Topics • Object Oriented Programming (Chapter 8) – Encapsulation – Implementing classes – Implementing methods – Object construction – Constructors • Methods (Chapter 5) – Definition and Invocation.
Use the following Guidelines: • Give identifiers semantic meaning and make them easy to read (examples numStudents, grossPay, etc). • Keep identifiers to a reasonably short length. • User upper case for constants. Use title case (first letter is upper case) for classes. Use lower case with uppercase word separators for all other identifiers (variables, methods, objects). • Use tabs or spaces to indent code within blocks (code surrounded by braces). This includes classes, methods, and code associated with ifs, switches and loops. Be consistent with the number of spaces or tabs that you use to indent. • Use white space to make your program more readable.
Important Note: All submitted assignments must begin with the descriptive comment block. To avoid losing trivial points, make sure this comment header is included in every assignment you submit, and that it is updated accordingly from assignment to assignment. (If not, -1 Pt) //*********************************************************** // Name: your name // Title: title of the source file // Description: Write the description in your words. // Time spent: how long it took you to complete the assignment // Date: the date you programmed //**********************************************************
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
Your programming assignments require individual work and effort to be of any benefit. Every student must work independently on his or her assignments. This means that every student must ensure that neither a soft copy nor a hard copy of their work gets into the hands of another student. Sharing your assignments with others in any way is NOT permitted. Violations of the University Academic Integrity policy will not be ignored. The university academic integrity policy is found at https://www.asu.edu/studentlife/judicial/integrity.html Don’t use any paid tutoring service online. We have strong connections to the world-wide proctors on the site, and if you use it, very serious penalty (expel, cheating academic history, etc) will be given.
Part 1: Writing Exercise: (5 pts) Don’t change ANY codes or add any lines to the Assignment5.java (If changed, -5 Pts). Write the answers in a comment block in your Quiz.java (Part 2). Download and look at the Assignment5.java, and answer the following questions. This Assignment5.java is a test code for the Quiz class, which you are asked to develop in the Part2. a. Explain what this program is within 500 words. Using the keyword quiz and list up the task of each command (A, B, …) b. What is the quiz called, and what is the Quiz called? c. List up all Quiz ‘s methods/constructors invoked in the Assignment5.java. (Show the line number and name of method for each) d. Explain in your words why the nextLine() methods are used instead of next( )? e. Explain what is happened when the user type “?” command. /* a) This program is to … b) The quiz is … , and Quiz is … c) XXX(XXX)at line-5, XXX(xxx, xxx)at line-100, … d) The nextLine() is required because … e) It returns
Part 2: Programming (15 Pts) This assignment is to write a class definition (not a program, there is no main method) named Quiz (saved in a file Quiz.java). The class has the following instance variables: private String question private String choiceA private String choiceB private String choiceC private String choiceD private char correctAnswer
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
The class must include the following constructor and methods: (If your class does not contain any of the following methods, points will be deducted).
Method Description of the Method public Quiz(String, String, String, String, String, char) Initialize all instance variables with the inputs. (2 Pts). public String displayQuiz() Return the question and 4 choices in the specific format (look at the samples). Don’t use any System.out method but return the all items as one single string data. (2 Pts) public void setQuestion (String) Set/update the question (1 Pts) public void setChoices (String, String, String, String) Set/Update the four choices. (1 Pts) public void setCorrectAnswer(char) Set the correct answer (1 Pt) private String getChoice (char) This is not a regular getter method. It returns one of the questions corresponding to the input character. e.g. getChoice(‘C’) returns the choiceC. (3 Pts) public void randomize(String ) Change the order of questions by the input string, and update the correct answer matching to the new order. For example, “BACD” input swap the choiceA and choiceB. The following is the pseudo code. (3 Pts) 1) Get and keep the index of correct answer letter in the input. 2) Use the getChoice(char) for each letter of input, and set the new four choices. 3) Update the correct answer letter from “ABCD” using the index obtained in 1). public boolean isCorrect (char) Check if the input character is same as the correct answer. (2 Pts)
This assignment has only one task, but the development process is decomposed into several steps. Follow the instruction one by one. Don’t go to the next step if your program does not return the proper output in each step. Step 1: Check the Assignment5.java Compile and run the Assignment5.java. You MUST have error messages because another class is required to compile the code. Don’t change anything in the Assignment5.java during this
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
homework. If you change any code, you lose 5 Pts. Go to the next step and start to implement the Quiz.java. Step 2: Develop a class with dummy methods Make a new file and save it a Quiz.java in the same location as Assginment5.java. Create all required instance variables and methods with dummy (no error code) statements in the class. Keep empty in the void-type method, and make only one return statement in the return-type method. The Quiz class with dummy statements looks like below.
Once all dummy methods are finished, compile the Quiz.java and Assignment5.java in your development environment. Run (execute) the Assignment5 after both files are complied. If it works, submit the both java files to the online site. You will see the following output, which run without any error, but nothing is done because all methods are dummy so far. Dummy Program Output (No compile error but do nothing) ****** Tester Program ****** Command Options ——————– A: Test the quiz B: Edit the question C: Edit the choices R: Randomize the choices Q: Quit the program ?: Display this menu ———————————— Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) B [Edit the question]
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
[Type a question]: Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) C [Edit the first choice] [Type the first choice A]: [Type the second choice B]: [Type the third choice C]: [Type the forth choice D]: [Type the correct answer]: Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A [Test the quiz!] [Type A, B, C or D] No!
Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A [Test the quiz!] [Type A, B, C or D] No!
Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A [Test the quiz!] [Type A, B, C or D] No!
Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) R [Randomize the choices] [Type a random pattern like a BACD ]: Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A [Test the quiz!] [Type A, B, C or D] No!
Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A [Test the quiz!] [Type A, B, C or D]
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
No!
Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) Command Options ——————– A: Test the quiz B: Edit the question C: Edit the choices R: Randomize the choices Q: Quit the program ?: Display this menu ————————————
Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) ****** End of Program ******
Step 3: Complete Methods Now it is time to start the real programming. Complete all constructor and methods required in the table above. If it works in your environment, submit the both java files to the online site, and check if your output is the same as the output example. Example Execution: The following are example inputs and outputs. The user inputs are shown in red (which is not seen online submission). Make your own questions rather than the examples. Program Input B What is 3 + 5? C 8 9 10 11 A A B A C A A R BADC A A A
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
B ? Q
Program Output ****** Tester Program ****** Command Options ——————– A: Test the quiz B: Edit the question C: Edit the choices R: Randomize the choices Q: Quit the program ?: Display this menu ———————————— Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) B B [Edit the question] [Type a question]: What is 3 + 5? Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) C C [Edit the first choice] [Type the first choice A]: 8 [Type the second choice B]: 9 [Type the third choice C]: 10 [Type the forth choice D]: 11 [Type the correct answer]: A Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit)A A [Test the quiz!] Q: What is 3 + 5? A): 8 B): 9 C): 10 D): 11 [Type A, B, C or D] B No! Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A A [Test the quiz!] Q: What is 3 + 5? A): 8 B): 9 C): 10 D): 11 [Type A, B, C or D] C
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
No! Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A A [Test the quiz!] Q: What is 3 + 5? A): 8 B): 9 C): 10 D): 11 [Type A, B, C or D] A Good Job! Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) R R [Randomize the choices] [Type a random pattern like a BACD ]: BADC Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A A [Test the quiz!] Q: What is 3 + 5? A): 9 B): 8 C): 11 D): 10 [Type A, B, C or D] A No! Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) A A [Test the quiz!] Q: What is 3 + 5? A): 9 B): 8 C): 11 D): 10 [Type A, B, C or D] B Good Job! Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) ? Command Options ——————– A: Test the quiz B: Edit the question C: Edit the choices R: Randomize the choices Q: Quit the program ?: Display this menu ———————————— <= “BADC” with no space betwen letters!
© 2018 Yoshihiro Kobayashi <ykobaya@asu.edu
Please input a command: (A:Quiz, B:Edit question, C:Edit choices, R:Randomize, Q:quit) Q ****** End of Program ******
NOTE: • Make only one scanner object using System.in. If your program does not run correctly because of this issue, you lose some points (-3Pts). • Use only the Java statements that have been covered in class to date. DO NOT use any other items out of the Chapter 1 – 5, 8 (Array, ArrayList, exit() etc.). If in doubt, ask the instructor. If you use them, then you lose the points of task. Complete each step one by one. • Don’t copy any code developed by others. • Don’t give your code to your classmates. • Don’t use any algorithm, which you cannot understand. • Your assignment file is checked by the MOSS (by Stanford Univ.), which is a program to detect cheatings. • Also we have the world-wide hot lines to detect cheating/violation using online support services such as freelancer.com and makemoney.com. /********************************************************************************** Submit your homework by following the instructions below: **********************************************************************************/ • Go to the course web site (my.asu.edu), and then click on the on-line Submission tab. Log in the site, which was registered at the first Lab session. Make sure you use the correct email address for registration. This will allow you to submit assignments. Please use your ASU e-mail address. • Submit the template Assignment5.java and your Quiz.java files on-line. Make sure to choose HW5 from drop-down box. • The Quiz.java should have the following, in order: • In comments, the assignment Header described in “Important Note”. • In comments, the answers to questions presented in Part#1. • The working Java code requested in Part #2.
• The file must compile and run as you submit it. You can confirm this by viewing your submission results. Important Note: You may resubmit as many times as you like until the deadline, but we will only mark your last submission. NO LATE ASSIGNMENTS WILL BE ACCEPTED.
