Oop

Question 1

What is OOPS?

Answer 1

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.

Question 2

Write basic concepts of OOPS

Answer 2

Abstraction.
Encapsulation.
Inheritance.
Polymorphism.

Question 3

What is a class?

Answer 3

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

Question 4

What is an object?

Answer 4

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

Question 5

What is Encapsulation?

Answer 5

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.

Question 6

What is Polymorphism?

Answer 6

polymorphism (from the Greek meaning “having multiple forms”) is the characteristic of being able to assign a different meaning or usage to something in different contexts - specifically, to allow an entity such as a variable, a function, or an object to have more than one form. There are several different kinds of polymorphism.

Question 7

What is Inheritance?

Answer 7

The ability have a parent class give a child access to functions and variables

Question 8

Define a constructor?

Answer 8

A method used to initialize a class, it has no return type and has the name of the class

Question 9

Define Destructor?

Answer 9

A method is called when an object goes out of scope

Question 10

What is a virtual class

Answer 10

A class than can be overridden

Question 11

What is function overloading?

Answer 11

The ability to define functions with the same name but a different number of arguments and argument types. The function may also have a different return type but a different return type alone is not enough to make an overloaded function.

Question 12

What is function overriding?

Answer 12

Function overriding is when a child class implements a function of a parent class replacing the functionality of the parent function

Question 13

What is an abstract class?

Answer 13

An abstract class is a class that can’t be instantiated but can be inherited from. It can have both declared and implemented functions

Question 14

What is a ternary operator?

Answer 14

The ternary operator is an operator that takes three arguments. The first argument is a comparison argument, the second is the result upon a true comparison, and the third is the result upon a false comparison

Bool ? AnswerIfTrue : AnswerIfFalse

Question 15

What is the finalize method

Answer 15

The finalize method is a destructor. It can’t be called explicitly but is used by the garbage collector.

Question 16

Types of parameters/arguements

Answer 16

Value
Ref
Out

Question 17

What is super keyword?

Answer 17

The super keyword is typically used in one of two situations. You can use it to explicitly call the base-class constructor with one or more arguments. You can also use it to access base-class members that have been overridden by the current class.