CODEWITHSUNDEEP
iphoneiosobjective-cios6
iPhoneDev
iPhoneDev

Reputation: 89

Which of the following is NOT a root class in the context of Objective-C?

Which of the following is NOT a root class in the context of Objective-C?

a. NSObject

b. NSNetworkService

c. NSBase

d. NSProxy

(its a single select question)

I get this question in a online exam for iOS 6. I knowNSObject and NSProxy are root classes. But I am not aware of any class with name NSNetworkService or NSBase.

I am wondering what is the correct answer for this question.

Note: I have cleared that test and not posting this question for cheating.

Upvotes: 6

Views: 751

Answers (2)

Norbert
Norbert

Reputation: 4291

I'm not aware of the classes NSNetworkService and NSBase (of course someone could name his class with prefix NS). NSObject and NSProxy are base classes, though. So the correct answer is b and c.

Edit (thanks Abizern): In the context of iOS, only NSObject is available which would add answer d to the set of classes NOT being a root class. I guess the opposite question "Which of the following classes are root classes?" would have been easier to answer given the fact that you said you can choose only one option ;)

Upvotes: 3

SAMIR RATHOD
SAMIR RATHOD

Reputation: 3506

see in the following link

1) NSObject is the root class of most Objective-C class hierarchies; it has no superclass.

2) Cocoa supplies two root classes: NSObject and NSProxy. Cocoa defines the latter class, an abstract superclass, for objects that act as stand-ins for other objects; thus NSProxy is essential in the distributed objects architecture. Because of this specialized role, NSProxy appears infrequently in Cocoa programs. When Cocoa developers refer to a root or base class, they almost always mean NSObject.

http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/CocoaObjects.html#//apple_ref/doc/uid/TP40002974-CH4-SW35

Edit

see this link http://samplecodebank.blogspot.in/2013/06/NSNetService-getInputStream-example.html

but there is no any discription of NSBase on Google or SO

So the answer is c. NSBase

Upvotes: 0

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