Object Oriented Design Concepts

I have an interview tomorrow, and the haunting words

• Encapsulation
• Inheritance
• Polymorphism
• Abstraction
• Cohesion
• Coupling

Succinct descriptions and examples

Encapsulation

Separation of what varies and what stays the same. Hiding complexity

Inheritance

Ability to get attributes and behaviour from another class. A super class.

Polymorphism

Programming to a single interface not an implementation.

Abstraction

Presentation of simple concept to outside word

Cohesion

Measure of how closely a class supports a single well focus purpose and/or responsibility.

Coupling

Coupling is the degree to which a class knows about another class.