Types and Classes

Question 1

What are the two kinds of types in programming?

Answer 1

Built in
User defined (for object oriented programming)

Question 2

What is a class?

Answer 2

Defines a type and allows the creation of new types

Question 3

What is an object?

Answer 3

An instance of a class

Question 4

What is the construct to instantiate (create) an object?

Answer 4

Type ObjectIdentifier = new Type();
i.e Employee John = new Employee();

Question 5

What is a method?

Answer 5

A method takes in parameters and does something with those values

Question 6

What is a public vs private class or method?

Answer 6

Public is accessible by anywhere in the code

Private is only accessible by within the same class

Question 7

What are the 3 attributes of classes?

Answer 7

Fields
Properties
Methods

Question 8

What are properties of a class?

Answer 8

Inherently public; used to store values

Question 9

What are fields of a class?

Answer 9

Inherently private, only can be accessed by methods of the class; used to store values

Question 10

What is camelCase vs PascalCase?

Answer 10

camelCase uses lowercase first letter

PascalCase uses uppercase first letter

Question 11

What syntax uses camelCase?

Answer 11

Fields, Variables, Parameters (myValue)

Question 12

What syntax uses PascalCase?

Answer 12

Class, Constants, Properties (MyValue)

Question 13

What is polymorphism?

Answer 13

Derived class overrides the inherited behaviour of the base class

Question 14

How is polymorshpism implemented?

Answer 14

Create virtual method in parent(base) class and modify it in the derived class by specifying override

Question 15

What is encapsulation?

Answer 15

Allows classes to hide their implementation through using access modifiers to deny access to members of a class

Question 16

What is an overloaded constructor?

Answer 16

A procedure that is automatically invoked with the instantiation of an object, overloaded means it accepts parameters

Question 17

What is a default constructor?

Answer 17

A procedure that is automatically invoked with the instantiation of an object, default has no parameters and can’t change

Question 18

What is the single inheritance model?

Answer 18

A class can inherit from one base class
Standard supported in .NET Framework

Question 19

What access does public access modifier give?

Answer 19

Type or member can be accessed by any other code in assembly and othe rassemblies

Question 20

What access does private access modifier give?

Answer 20

Type or member can only be accessed by code in the same class or struct

Question 21

What access does protected access modifier give?

Answer 21

Type or member can only be accessed by code in the same class or in a derived class

Question 22

What access does internal access modifier give?

Answer 22

Type or member can be accessed by any code in the same assembly, not from another

Question 23

What access does protected internal access modifier give?

Answer 23

Type or member can be accessed by any code in the same assembly or derived class in another assembly

Question 24

What is the difference between a constructor and a method?

Answer 24

Constructor is run implicitly once with new object, Method is explicitly called

Constructor has same name as class