OOPS

Encapsulation

“Hiding of data.”

Process of hiding:

• Properties (variables).
• Behavior (functions).

Done using access modifiers.

• public.
• protected.
• private.
• friend.

friend violates the concept of object oriented programming.

Inheritence

Process by which one object gains the properties of another objects.

• Generalization
  • is/are relation.
• Composition
  • has/made-of relation.
• Aggregation
  • has/are relation.

Types:

• Single.
• Multi-level.
• Multiple (ONLY in C++).

Composition is when “life of object depends on subclass”.

Multi-Level Inheritence

In general, the code should be highly cohesive & loosely coupled.