Final

Question 1

encapsulation

Answer 1

classes and objects can hide information from the outside world

Question 2

Polymorphism

Answer 2

The fact that child classes can override the methods and attributes of the super class

Question 3

inheritance

Answer 3

any class may inherit    
    members from another class.

Question 4

class modifiers

Answer 4

internal (or none)–Class accessible only from within the current project
public–Class accessible from anywhere.
abstract–accessible only from within the current project, and cannot be instantiated, only derived from.
public abstract–Class accessible from anywhere, and cannot be instantiated, only derived from.
sealed–cannot be derived from, only instantiated.

Question 5

new

Answer 5

Applies To Function members

The member hides an inherited member with the same signature.

Question 6

static

Answer 6

The member does not operate on a specific instance of the class

Question 7

virtual

Answer 7

Classes and function members only

–The member can be overridden by a derived class.

Question 8

abstract

Answer 8

Function members only–A virtual member that defines the signature of the member, but does not provide an implementation

Question 9

override

Answer 9

Function members only–The member overrides an inherited virtual or abstract member.

Question 10

sealed

Answer 10

Classes, methods, and properties–For classes, the class cannot be inherited from. For properties and methods, the member overrides an inherited virtual member, but cannot be overridden by any members in any derived classes. Must be used in conjunction with override.

Question 11

extern

Answer 11

Static methods only–The member is implemented externally, in a different language.

Question 12

properties

Answer 12

Sets of functions that can be accessed from the client as a

field. Improves data integrity.

Question 13

Methods

Answer 13

Functions associated with a class. Can be static (tied to the
class) or instance (tied to the object).

Question 14

Constructors

Answer 14

Special functions that run automatically when an object

is created. Good for initializing the values of fields

Question 15

collections

Answer 15

Collections are similar to arrays in that they hold groups of objects.
Collections differ from arrays in that they provide advanced functionality such as:
Ability to grow once they are created
Controlled access to objects
Provide functions to search and sort
Ability to provide strongly typed collections
Ability to expose specialized methods

Question 16

ArrayList

Answer 16

increase and decrease the number of elements dynamically

can hold a collection of similar objects.

Question 17

ArrayList syntax

Answer 17

using System.Collections;
ArrayList animalArrayList = new ArrayList();
Cow myCow = new Cow(“Bossie”);
animalArrayList.Add(myCow);
animalArrayList.Add(new Chicken(“Cluck”));

Question 18

delegate

Answer 18

an object that points to another

method (or list of methods) in the application.

Question 19

delegate syntax

Answer 19

public delegate int MathOp(int x, int y);
public class SimpleMath
{
  public static int Add(int x, int y)
   { return x + y; }
  public static int Sub(int x, int y)
   { return x – y; }
}

class Program
{
  Static void Main()
  {
    MathOp myOp = new MathOp(SmpleMath.Add);
    MathOp myOp2 = new MathOp(SimpleMath.Sub);
    Console.WriteLine(“10 + 10 is {0}”, myOp(10,10));
    Console.WriteLine(“10 – 5 is {0}”, myOp2(10,5));
  }
}

Question 20

Enumerations

Answer 20

a convenient way to
create a set of symbolic names that map to known
numeric values.

Question 21

Enumerations syntax

Answer 21

enum EmployeeType
	 {
	  Manager = 50,  
 	  Clerk = 10, 
 	  President = 100,    
 	  Customer = 6
 	 }

Question 22

StreamReader

Answer 22

string line;
	using (StreamReader reader = new StreamReader("file.txt"))
	{
	    line = reader.ReadLine();
	}
	Console.WriteLine(line);
    }