Object Model

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Elements of the Object Model

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The four major elements of the object model (the conceptual framework of an object-oriented thing) ::

1. Abstraction
2. Encapsulation
3. Modularity
4. Hierarchy

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The three minor elements ::

1. Typing
2. Concurrency
3. Persistence.

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The major elements are essential whereas the minor ones are useful but not essential. Now we try to elaborately define major elements and minor elements.

Major Elements

The major elements are listed below.

Abstraction

An abstraction denotes the essential characteristics of an object that distinguish it from all other kinds of objects. Thus it provides crisply defined conceptual boundaries, relative to the perspective of the viewer.

Encapsulation

Encapsulation is the process of compartmentalizing the elements of an abstraction that constitutes its structure and behavior.

Modularity

Modularity is the property of a system that has been decomposed into a set of cohesive and loosely coupled modules.

Hierarchy

Hierarchy is a ranking of ordering of abstractions. The two most important hierarchies in a complex system are its class structure (‘is a’ or Generalization/specialization) and object structure (‘part of’ or whole part).

Minor Elements

The minor elements are listed below.

Typing

Concepts of typing derive primarily from theories of abstract data types. A type is a precise characterization of structural or behavioral which a collection of entities all share.

Concurrency

It is the property that distinguishes an active object from one that is not active.

Persistence

Is the property of an object through which its existence transcends time (i.e. the object continues to exist after its creator ceases to exist) and/or space (i.e. the object’s location moves from the address space in which it was created).