ITPEC FE Morning October 2020 Question 46

Class vs Instance in OOP — an instance is created based on the definition of a class.

A class is a blueprint that defines attributes and methods. An instance (object) is a concrete entity created from that class using a constructor.

• •Class → template / blueprint
• •Instance → concrete object created from the class
• •One class can produce many instances
• •One instance belongs to one class

Why not others:
- (a) Reversed — the class defines specifications, not the instance
- (c) An instance is created from one class, not multiple
- (d) Multiple instances can exist for one class

Key rule: Class : Instance = Blueprint : Building. One blueprint, many buildings.

AI-generated — may contain errors