11.2. Four Pillars of OOP

Try these first

1. 1.

   Define encapsulation in your own words.

   Hint

   Think of it like a protective case for your data.

2. 2.

   What is inheritance?

   Hint

   Consider how children inherit traits from parents.

3. 3.

   What does encapsulation refer to?

   • a) The ability to inherit from multiple classes
   • b) Hiding data and providing a controlled interface
   • c) The process of creating abstract classes

   Hint

   Think about how you keep your personal data safe.

4. 4.

   Is inheritance a key feature of OOP?

   • True
   • False

   Hint

   Consider how family traits pass down through generations.

5. 5.

   Create a Java program that includes a base class Vehicle with properties like make and model. Extend this class with subclasses for Car and Bike, demonstrating encapsulation, inheritance, and polymorphism.

   Hint

   Think about how vehicles are similar yet have distinct features.

6. 6.

   Illustrate the use of all four pillars by designing a small application for an employee management system, where you define an abstract class Employee, and derive classes like FullTimeEmployee and PartTimeEmployee.

   Hint

   Consider how different employment types affect salary calculations.