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C# Programming :: Interfaces

Interfaces - General Questions

  1. Which of the following statements are correct about an interface used in C#.NET?

    1. An interface can contain properties, methods and events.
    2. The keyword must implement forces implementation of an interface.
    3. Interfaces can be overloaded.
    4. Interfaces can be implemented by a class or a struct.
    5. Enhanced implementations of an interface can be developed without breaking existing code.

    2. A.
    1, 2
    B.
    1, 4, 5
    C.
    3, 4
    D.
    3 only

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  2. Which of the following can implement an interface?

    1. Data
    2. Class
    3. Enum
    4. Structure
    5. Namespace

    3. A.
    1, 3
    B.
    2, 4
    C.
    3, 5
    D.
    4 only

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  3. Which of the following statements is correct about the C#.NET code snippet given below?

    
 interface IMyInterface 
 {  
     void fun1();  
     void fun2(); 
 } 
 class MyClass: IMyInterface 
 {   
      private int i;    
      void IMyInterface.fun1()     
      {       
         // Some code 
      }
   }

    4. A.

    Class MyClass is an abstract class.
    B.

    Class MyClass cannot contain instance data.
    C.

    Class MyClass fully implements the interface IMyInterface.
    D.

    Interface IMyInterface should be inherited from the Object class.
    E.

    The compiler will report an error since the interface IMyInterface is only partially implemented.

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  4. Which of the following statements is correct about the C#.NET code snippet given below?

      interface IPerson
  {  
     String FirstName  
     {      
        get;      
        set;   
    }       
    String LastName  
    {     
        get;    
        set;   
    }    
    void Print();    
    void Stock(); 
    int Fun();
 }

    5. A.

    Properties cannot be declared inside an interface.
    B.

    This is a perfectly workable interface.
    C.

    The properties in the interface must have a body.
    D.

    Subroutine in the interface must have a body.
    E.

    Functions cannot be declared inside an interface.

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  5. Which of the following is the correct way to implement the interface given below?

    interface IPerson 
{    
      String FirstName  
      {      
          get;     
          set;     
     }
  }

     

     

    6. A. 
    class Employee : IPerson 
{   
    private String str;  
    public String FirstName   
    {        
         get      
         {           
             return str;      
         }       
         set       
         {           
             str = value; 
         }   
      } 
   }
    B. 
     class Employee
 {   
     private String str;   
     public String IPerson.FirstName   
     {         
        get      
        {            
            return str;       
        }       
        set        
        {             
            str = value;   
        }    
    }  
 }
    C. 
     class Employee : implements IPerson
 {  
     private String str;   
     public String FirstName   
     {       
          get       
          {           
             return str;      
          }
          set    
          {          
             str = value;    
          }   
       } 
    }
     
    D.

    None of the above

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