OOPS interview Questions and Answers Part -1

What is OOPS?

OOPS is abbreviated as Object Oriented Programming system in which programs are considered as a collection of objects. Each object is nothing but an instance of a class.

Write basic concepts of OOPS?

Following are the concepts of OOPS and are as follows:

  1. Abstraction
  2. Encapsulation
  3. Inheritance
  4. Polymorphism.

What is a class?

A class is simply a representation of a type of object. It is the plan/blueprint/template that describe the details of an object.

What is an object?

Object is termed as an instance of a class, and it has its own state, behavior and identity.

What is Encapsulation?

Encapsulation is an attribute of an object, and it contains all data which is hidden. That hidden data can be restricted to the members of that class.

Levels are Public, Protected, Private, Internal and Protected Internal.

What is Polymorphism?

Polymorphism is nothing but assigning behavior or value in a subclass to something that was already declared in the main class. Simply, polymorphism takes more than one form.

What is Inheritance?

Inheritance is a concept where one class shares the structure and behavior defined in another class. If inheritance applied on one class is called Single Inheritance, and if it depends on multiple classes, then it is called multiple Inheritance.

Define a constructor?

Constructor is a method used to initialize the state of an object, and it gets invoked at the time of object creation. Rules for constructor are –

  • Constructor Name should be same as class name.
  • Constructor must have no return type.

Define Destructor?

Destructor is a method which is automatically called when the object is made of scope or destroyed. Destructor name is also same as class name but with the tilde symbol before the name

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