Classes and Objects

Classes and Objects

Specification

Be familiar with the concepts of:

• class
• object
• instantiation

Students should know that:

• a class defines methods and property/attribute fields that capture the common behaviours and characteristics of objects.
• objects based on a class are created using a constructor, implicit or explicit, and a reference to the object assigned to a reference variable of the class type.
• in the Unified Modelling Language (UML) composition is represented by a black diamond line and aggregation by a white diamond line.

Objects

Rather than storing data with constants and variables like procedural programs, object-oriented programs use objects as containers of both data and instructions.

New objects are created from classes. The process of creating an object is called instantiation. It is…