Object-Oriented Programming

Overview:

In this assignment, you will be analyzing the basic concepts for object-oriented programming, how to create classes that contain attributes, and different types of methods.

Instructions:

Answer the following questions:

1. Discuss the rationale behind restricting access to object attributes and requiring class users to only access attributes using methods. Explain how private access restricts outside class users from directly accessing attributes (and methods). In contrast, public access specifies that an outside class may use a method (or attribute) of the class.

2. Describe the benefits of encapsulation and information hiding also called data hiding. As applied to objects, this means that outside objects should not be able to alter an object’s attributes but should instead interact with the object via methods.

3. Define the terms instance variable, field, and state. Explain how class methods are shared by all objects of a class.

4. Discuss how a class client, or class user, can use a class that has been written by another programmer. 5. Create a class diagram of one or more classes that would support a simple online library catalog.

6. Write pseudocode class definitions of one or two of the classes created in the previous exercise.

7. When a class contains objects of another class, the relationship is called a whole-part relationship or composition. The relationship created is also called a has-a relationship. Discuss some of the possible issues with composition, such CIS216 – Programming Principles Object-Oriented Programming as the long statement: output sales.getHighestPaidEmployee().getHireDate().getYear().

 

8. Describe the rules that govern the attributes of a parent class that can be accessed by a child class and the reverse

9. Discuss the advantages of using inheritance and why superclass code is considered more reliable. 10.Research how a derived class can access the constructor of its parent class.

11.Research the topic of multiple inheritances. Describe this concept and explain how it is commonly used in object-oriented programming languages.

12.Create a try–catch block to accept a birth date, entered separately as a month, day, and year. Included should be checks for the month (1–12), day (28, 29 [if you dare], 30, and 31 days), and year (<= this year).

Requirements:

• Show your work in a Word document.

o Include all your work for each question.

o You can include screenshots of work done on paper.

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