Lab Instructions
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Java Programming COMP-228
Lab#2 __________________Page 1 of 3
Lab Assignment #2
Due Date: Week 5 ( Friday, 5th October) Marks/Weightage: 20/5%
Purpose: The purpose of this Lab assignment is to:
Practice the use of instance methods in Java classes
Practice the use of static methods in Java classes
References: Read the course’s text “Java How to program, 11th edition Early Objects”, chapters 6 to 7 and
the lecture notes/ppts. This material provides the necessary information that you need to
complete the exercises.
Instructions: Be sure to read the following general instructions carefully:
This lab should be completed individually by all the students. You will have to demonstrate your
solution in a scheduled lab session and submitting the project through drop box link on e-Centennial.
You must start and name your Eclipse workspace according to the following rule:
FirstName_LastName _SectionNumber_COMP228_Labnumber
For Example: John_Smith_Sec001_COMP228_Lab02
Each exercise should be placed in a separate project named exercise1, exercise2, etc.
You should have a package name as follows:
FirstName_LastName_Exercise01 and so on…
Submit your assignment in a zip file that is named according to the following rule:
FirstName_LastName _SectionNumber_COMP228_Labnumber.zip
Example: Joh_Smith_Sec005_COMP228_Lab02.zip
Apply the naming conventions for variables, methods, classes, and packages:
- variable names start with a lowercase character for the first word and uppercase for every other word
- classes start with an uppercase character of every word
- packages use only lowercase characters
- methods start with a lowercase character for the first word and uppercase for every other word
Note: You are required to be present during the in-class demonstration. Late submission will not be
considered
Programming Exercise #1: [7 marks]
Write a Java application that simulates a test. The test contains at least five questions about first three
lectures of this course. Each question should be a multiple-choice question with 4 options.
Design a QuestionBank class. Use programmer-defined methods to implement your solution. For example:
- create a method to simulate the questions – simulateQuestion
- create a method to check the answer – checkAnswer
- create a method to display a random message for the user – generateMessage
- create a method to interact with the user - inputAnswer
Java Programming COMP-228
Lab#2 __________________Page 2 of 3
Use a loop to show all the questions.
For each question:
- If the user finds the right answer, display a random congratulatory message (“Excellent!”, ”Good!”,
”Keep up the good work!”, or “Nice work!”).
- If the user responds incorrectly, display an appropriate message and the correct answer (“No. Please
try again”, “Wrong. Try once more”, “Don't give up!”, “No. Keep trying..”).
- Use random-number generation to choose a number from 1 to 4 that will be used to select an
appropriate response to each answer.
- Use a switch statement to issue the responses, as in the following code:
switch ( randomObject.nextInt( 4 ) )
{
case 0:
return( "Very good!" );
……
}
At the end of the test display the number of correct and incorrect answers, and the percentage of the correct
answers.
Your main class will simply create a QuestionBank object ( in the driver class – QuestionBankTest.java) and
start the test by calling inputAnswer method.
Programming Exercise #2: [7 marks]
Design a Lotto class with one array instance variable to hold three random integer values (from 1 to 9). Include
a constructor that randomly populates the array for a lotto object. Also, include a method in the class to
return the array.
Use this class in the driver class ( LottoTest.java) to simulate a simple lotto game in which the user chooses a
number between 3 and 27. The user runs the lotto up to 5 times ( by creating an object of Lotto class each time
and with that three random integer values will be stored in objects’s array instance variable) and each time
the sum of lotto numbers (sum of three random integers values) is calculated. If the number chosen by the user
matches the sum, the user wins and the game ends. If the number does not match the sum within five rolls, the
computer wins.
Programming Exercise #3: [6 marks]
Write a Java class that implements a static method – SortNumbers(int… numbers) with variable number of
arguments. The method should be called with different numbers of parameters and does arrange the numbers
in descending order. Call the method within main method and display the results.
Java Programming COMP-228
Lab#2 __________________Page 3 of 3
Evaluation:
Functionality
Correct implementation of classes
(instance variable declarations,
constructors, getter and setter
methods, etc.)
40%
Correct implementation of driver
classes (declaring and creating objects,
calling their methods, interacting with
user, displaying results)
40%
Comments, correct naming of
variables, methods, classes, etc.
10%
Friendly input/output
10%
Total
100%
