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“OOAD Interview Questions and Answers will guide that Object-oriented analysis and design (OOAD) is a software engineering approach that models a system as a group of interacting objects. Each object represents some entity of interest in the system being modeled, and is characterized by its class, its state (data elements), and its behavior. So learn OOAD with the help of this OOAD Interview Questions with Answers guide”



63 OOAD Questions And Answers

1⟩ What are models and meta models?

Model:

It is a complete description of something (i.e. system).

Meta model:

It describes the model elements, syntax and semantics of the notation that allows their manipulation.

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2⟩ What do u meant by SBI of an object?

SBI stands for State, Behavior and Identity. Since every object has the above three.

State:

It is just a value to the attribute of an object at a particular time.

Behaviour:

It describes the actions and their reactions of that object.

Identity:

An object has an identity that characterizes its own existence. The identity makes it possible to distinguish any object in an unambiguous way, and independently from its state.

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3⟩ Differentiate persistent & non-persistent objects?

Persistent refers to an object's ability to transcend time or space. A persistent object stores/saves its state in a permanent storage system with out losing the information represented by the object.

A non-persistent object is said to be transient or ephemeral. By default objects are considered as non-persistent.

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4⟩ What are the steps involved in designing?

Before getting into the design the designer should go through the SRS prepared by the System Analyst.

The main tasks of design are Architectural Design and Detailed Design.

In Architectural Design we find what are the main modules in the problem domain.

In Detailed Design we find what should be done within each module.

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6⟩ What do you mean by analysis and design?

Analysis:

Basically, it is the process of determining what needs to be done before how it should be done. In order to accomplish this, the developer refers the existing systems and documents. So, simply it is an art of discovery.

Design:

It is the process of adopting/choosing the one among the many, which best accomplishes the users needs. So, simply, it is compromising mechanism.

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