Review Questions

1. What is an object (from the perspective of reality)?
2. What is an object (from the perspective of object-oriented software development)?
3. What are the differences between classes and objects?
4. Explain the differences between encapsulation and information hiding. How are these two concepts related?
5. List the private and public characteristics (properties and methods/operations) for every type of object in the “books in a bookstore” scenario. Why do you need these characteristics?
6. Distinguish between the programming approach used in procedural programming and object-oriented programming.
7. Discuss the validity of the following statement: The object-oriented programming approach is ideal for simulating real-world problems.
8. Consider the scenario of buying books from a bookstore. Outline the objects in such a transaction together with the messages exchanged.
9. Given the class definition Rectangle below, describe the structure of any three instances of the Rectangle.

   class Rectangle {
     Attributes:
       length
       width
     Methods:
       getLength() { return length }
       getWidth() { return width }
       draw() { ... }
   }

10. Distinguish between a client and a server in object-oriented programming, as opposed to network programming.