Introduction to OPP

Question 1

Four pillars of OPP

Answer 1

Abrstraction, Polymorphism, Encapsulation, Inheritance

Question 2

Real-world object or phenomenon,
limited to a specific context, which represents all details rele-
vant to this context with high accuracy and omits all the rest

Answer 2

Abstraction

Question 3

Data stored inside the object’s fields is often referenced
as…

Answer 3

State

Question 4

All the object’s methods define its

Answer 4

Behaviour

Question 5

Ability of an object to hide partsof its state and behaviours from other objects, exposing only limited interface to the rest of the program

Answer 5

Encapsulation

Question 6

Why you can’t define field in the inteface

Answer 6

Inteface definies a contract of inteactions between objects

Question 7

Weaker variant of association that usually implies that there’s no permanent link between objects.
Dependency typically (but not always) implies that an object
accepts another object as a method parameter, instantiates, or
uses another object

Answer 7

Dependency