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98-161 > Class > Flashcards

Class Flashcards

1
Q

Abstraction in C#

A

Process of showing only essential information to user

Missing or incomplete implementation

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2
Q

Abstract class

A 
base class cannot be used to create objects only can be accessed from inherited objects
cannot be static class
cannot have multiple inheritance
cannot be inherited from structures
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3
Q

Abstract method

A

used only in abstract class without body and can be used by derived/inherited class

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4
Q

default access modifier

A

most restricted acess to that member

class —> internal

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5
Q

Indexer

A

Instance of a class or struct to be indexed as an array

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6
Q

Arguments to console application

A

string array object

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7
Q

DDL commands

A

Create, alter, truncate, drop

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8
Q

DML commands

A

Insert, update, delete,select

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9
Q

Default constructor parameters

A

zero. when no constructor defined

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10
Q

Connection pooling

A

Cache of the connection established so as to reuse when further requests to the database

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11
Q

struct / structure

A

value type – single variable hold related info/record

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12
Q

Cardianility

A

Relationship is one to one, one to many or many to many

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13
Q

Inheritance

A 
Allow to define a class in terms or another class from one base class only  Object class is the ultimate base class
struct does not support inheritance
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14
Q

Restriction to be a Base class

A

Only time class cannot be used as base class

  1. sealed
  2. only private constructors
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15
Q

Polymorphism

A

Class to have multiple implementations with the same name
Static/Compile time polymorphism –>Early Binding
–>overloading
Dynamic/Runtime polymorphism —>Late Binding
–>overridng

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16
Q

Access base class virtual member

A

base.A()

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17
Q

shadowing

A 
using 'new' keyword to hide the base class member
[method hiding]
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18
Q

nested class

A 
class inside another class to logically group 
--->encapsulation
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19
Q

encapsulation

A

data hiding –>mark all variables as private and use public get set method to access data
or hiding the complexity

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20
Q

Garbage collection

A

The process of releasing memory

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21
Q

root

A

storage location with the reference to an object in managed heap

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22
Q

clrMD

A

Diagnostics. Runtime inspect crash dump and attach to live process and perform all sorts of queries against the runtime

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23
Q

MongoDb`

A

Collection and concepts
Database is a physical container of collections
Database –>Collection of documents/tables
Document–>Row or key value pairs

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24
Q

Hexadecimal

A

0-9 ABCDEF

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25
Q

Dynamic variable

A

Change variable type at run time based on assigned value

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26
Q

ExpandoObject

A

Will let you add objects at runtime

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27
Q

dynamic contact=new ExpandoObject()

A

statically typed object of expandoobject type

28
Q

value types are stored in stack and reference type in heap

A

int inside a class is stored in heap

29
Q

Objectcache xxx=memoryCache.Default in c#

A

In MVC controller can have attribute

OutputCache(duration:inseconds)

30
Q

Objectcache xxx=memoryCache.Default in c#

A

In MVC controller can have attribute
Default location: webserver,webbrowser, proxyserver)
OutputCache(duration:inseconds)

31
Q

main method is static

A

callable without creating an instance of a class

32
Q

data type

A

defines the size of memory to store data

33
Q

javascript – primitive, composite and special datatypes

A

primitive - string, boolean and number
composite - object array and function
special - undefined and null

34
Q

control transfer statement

A

break; continue

35
Q 
control structure, repetitive statements
While loop
Do while loop
for loop
for each
A

control transfer statement break; continue,goto, throw

Continue statement can be used to go to the next iteration without exiting the loop

36
Q

do while loop executes once before condition reaches

A

while loop checks the condition before executing

37
Q

Recursion

A

Calls the method by itself

38
Q

Stackoverflowexception

A

very deep and unbounded recursion

39
Q

Objects are self contained data structures with events, properties and methods

A

properities are called smart fields –>data represent
Method —>behavior
events —>communication

40
Q

constructors

A

special methods executed when a class is initiated

41
Q

property has 2 accessors

A

get and set the value of property

42
Q

data fields are declared private

A

Accessed using public properties

43
Q

Delegates

A

Encapsulates a method with a special signature

44
Q

Delegates

A

Encapsulates a method with a special signature

public delegate void RectangleHandler(Rectangle rect)

45
Q

namespace

A

organize code and use unique class names

46
Q

int, byte, bool, char struct value type

A

string, class, interface, object, delegate, class are reference types

47
Q

Assembly

A

Unit of executable code .exe or dll

48
Q

Access modifies namespace - default public

class - internal

A

no access modifiers allowed for namespace

public and internal for class

49
Q

Abstract method provides a definition, no implementation

A

Any member of the class is abstract, class itsellf need to be marked as abstract

50
Q

cast an object any of it base types

A

Cast to its class types or any of the base class types

51
Q

is operator to check casting can be done

A

as operator returns null is casting failed

52
Q

Icomparable namespace interface

A

int compareto(Object obj)

53
Q

Interface

A

Class that implements interface must implement all methods of the interface

54
Q

Class can have multiple interfaces can have only one base clas

A

Class is a template for object creation
Properties are data
Methods behavior
Events communication

55
Q

Managed code - generated by c# compiler executed by CLR

A

Unmanaged code compiled to native machine code executed by operating system

56
Q

Unit Testing – unit of code testing
Integration testing —integration of components testing
(component works with external webservice etc)
System Testing – overall testing of system software
Acceptance testing —>Alpha testing and Beta testing
Regression testing ->make sure nothing is broken with new functionality implementation

A

Black Box Testing – Input output testing

White Box Testing — unit testing —

57
Q

Stack data structure – LIFO or FILO

Last in first out

A

push, pop, peek

heterogenous auto resize

58
Q 
WCF-- Interface IService and class composite type
svc similar to asmx(web service)
A

IService –>OperationContract
CompositeType — >datacontract with datamember
communication mode –>tcp, http, named pipelines msmq and peer to peer

59
Q

Boxing is the process of converting a value type too reference type

A

stack to heap

60
Q

ArrayList can hold all variable types

A

array list is heterogeneous

Array is homogeneous

61
Q

Queue is a collection first in first out FIFO

circular array with head index and tail

A

Queue is heterogeneous- different variable types

Enqueue, dequeue, peek and contains

62
Q

Docker – container application

Docker Service, Kubernates, Service Fabric to work with multiple services in containers

A

container application are easy for debugging, deployment and testing

63
Q

Linked list is a collection of nodes with each node has a link to the next node in the sequence

A

Deletion and insertion fast and no limit to the size

64
Q

Sorting –> BubbleSort and QuickSort

A

Bubblesort —>comparison and swap

65
Q

Database bottlenecks:

A

abnormal cpu usage

memory leak — not enough RAM and database started using swap memory

66
Q

WCF–>endpoint

Address, Binding and Contract

A

Address: uri
Binding: HttpBinding or wshttpBinding
Contracts: Service, Data and Operation

98-161 (1 decks)

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