Inheritance_n_Polymorphism

In this exercise we are going to practice a few code related to inheritance and polymorphism. We are going to design a Quizz where a set of different types of questions like short question, MCQ, true/false will be displayed to the user and will collect response from the user. Also the program will check whether the response is rigth or wrong.

What you have in the starter code

We have a generic class called Question that has two member variables text, answer and a method called checkAnswer as described bellow:
text: stores the description of the question
answer: stores the correct answer for the question
checkAnswer(String ans): That takes the answer as an argument/parameter and checks whether it is correct or not. It returns true if the answer matched with the correct answer stored in the variable answer, otherwise returns false.

You also have a Main class that demonstrate the use of the Qustion.

What you have to do

Task 1

Import the project in eclipse from the repository.
Run the program and see how it works.
Try to understand the code and what it is doing.

Task 2

Create a new class called MCQQuestion that extends the class Question.
Your MCQQuestion class should have the following members:
An ArrayList choices to store the list of choices for a question.
A constructor that creates the ArrayList
A method addChoice(String choice, boolean correct) that adds choices for a question and stores as the answer for the question if the correct is true.
A method display() that overrides the display method of the super class to display the MCQ question properly with choices.
Rewrite the Main class to display a MCQ question and take a response from keyboard for the answer as the choice (1,2 ..)
Display if the answer is correct or not.
The screen may look like:

In which country was the inventor of Java born?
1: Canada
2: United States
3: Denmark
4: United State
Your answer: 1
true

Task 3

Create a new class called Quiz that will store a list of questions.
Add a method called addQuestion(Question Q) that can add any type of question in the list.
Add a method called allQuestions() that returns the list of questions added to a Quiz.
Rewrite the Main class that creates a Quiz object and adds at least three different questions with answers in order: first one is a regular question, second one is an MCQ, third one is a regular question and so on (Try to make your questions as difficult as possible).
Now display the questions from the Quiz one at a time and take a respose from the user.
Display whether the result is correct or not.
You may declare any helper method, or getter and setter or constructor if necessary.

Task 4

Now change the Question class as an Abstract class and change display as an abstract method.
Try to run the program and see what errors you get.
Try to fix those errors.
Now we don't have an inherited method display.
Create a new extended class from Question as ShortQuestion.
Use this ShortQuestion as we used the generic Question and rewrite your program.
Try to compile the ShortQuestion without overriding the display() method.
Write necessary code to fix the errors.

koushik-kumar / Tutorial_Inheritance