Objective-c Quiz: Categories And Protocols

11 Questions | By Malek BELKAHLA | Updated: Feb 20, 2023 | Attempts: 1606

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Objective-C Quiz: Categories and Protocols

Questions and Answers

1.

A category can be used to add new instance variables to a class.
- A.
  
  TRUE
- B.
  
  FALSE
2.

The lineid <Painting> myObject;
- A.
  
  Says that myObject is part of the Painting category
- B.
  
  Says that myObject conforms to the Painting category
- C.
  
  Says that myObject conforms to the Painting protocol
- D.
  
  Is not valid Objective-C syntax
3.

The conformsToProtocol: method can be used to see if an object belongs to a class that implements a particular protocol
- A.
  
  TRUE
- B.
  
  FALSE
4.

A category can be used to override other methods in the class, but it's not considered good programming practice.
- A.
  
  TRUE
- B.
  
  FALSE
5.

The [email protected] GObj: NSObject <Painting>
- A.
  
  Starts the definition of a Painting category
- B.
  
  Starts the definition of a Painting protocol
- C.
  
  Painting protocol
- D.
  
  Starts the definition of a class called GObj that conforms to the
- E.
  
  None of the above
6.

You could add a category to theNSString class, for example, to extend its functionality.
- A.
  
  TRUE
- B.
  
  FALSE
7.

The following:@interface Fraction (MathOps) [email protected]
- A.
  
  Defines a category called MathOps
- B.
  
  Defines a protocol called MathOps
8.

If you start a class definition that conforms to a specified protocol, you need to relist all the methods you will implement for that protocol in the @interface section.
- A.
  
  TRUE
- B.
  
  FALSE
9.

A category can be used to add new instance variables to a class.
- A.
  
  TRUE
- B.
  
  FALSE
10.

All of the methods in a category must be implemented
- A.
  
  TRUE
- B.
  
  FALSE
11.

A category can be a good way to divide the implementation of a class into logical sections
- A.
  
  TRUE
- B.
  
  FALSE