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

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Question
Which of the following statements is correct about an interface used in C#.NET?
Options
A. One class can implement only one interface.
B. In a program if one class implements an interface then no other class in the same program can implement this interface.
C. From two base interfaces a new interface cannot be inherited.
D. Properties can be declared inside an interface.
E. Interfaces cannot be inherited.

Correct Answer

Properties can be declared inside an interface.

Interfaces problems

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1. Which of the following is the correct way to implement the interface given below?
```
interface IPerson
{ 
    String FirstName
    {
        get;
        set; 
    } 
}
```
Options

class Employee : IPerson
{
    private String str; 
    public String FirstName
    {
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}

class Employee
{
    private String str;
    public String IPerson.FirstName
    { 
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}

class Employee : implements IPerson
{
    private String str; 
    public String FirstName
    { 
        get
        { 
            return str;
        } 
        set
        {
            str = value; 
        } 
    } 
}

D. None of the above

Discuss

Correct Answer:

class Employee : IPerson
{
    private String str; 
    public String FirstName
    {
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}

2. Which of the following statements is correct about an interface used in C#.NET?
Options
A. If a class implements an interface partially, then it should be an abstract class.
B. A class cannot implement an interface partially.
C. An interface can contain static methods.
D. An interface can contain static data.
E. Multiple interface inheritance is not allowed.

Discuss

3. Which of the following is the correct implementation of the interface given below?
```
interface IMyInterface
{ 
    double MyFun(Single i);
}
```
Options

class MyClass
{
    double MyFun(Single i) as IMyInterface.MyFun
    {
        // Some code
    }
}

class MyClass 
{
    MyFun (Single i) As Double
    {
        // Some code
    } 
}

class MyClass: implements IMyInterface
{
    double fun(Single si) implements IMyInterface.MyFun()
    {
        //Some code
    } 
}

class MyClass: IMyInterface
{
    double IMyInterface.MyFun(Single i)
    {
        // Some code
    } 
}

Discuss

Correct Answer:

class MyClass: IMyInterface
{
    double IMyInterface.MyFun(Single i)
    {
        // Some code
    } 
}

4. 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
    } 
}

Options
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.

Discuss

5. 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(); 
}

Options
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.

Discuss

6. Which of the following statements are correct about an interface in C#.NET?
1. A class can implement multiple interfaces.
2. Structures cannot inherit a class but can implement an interface.
3. In C#.NET, : is used to signify that a class member implements a specific interface.
4. An interface can implement multiple classes.
5. The static attribute can be used with a method that implements an interface declaration.
Options
A. 1, 2, 3
B. 2, 4
C. 3, 5
D. None of the above.

Discuss

7. Which of the following statements are correct about the delegate declaration given below?
```
    delegate void del(int i);
```
1. On declaring the delegate a class called del will get created.
2. The signature of del need not be same as the signature of the method that we intend to call using it.
3. The del class will be derived from the MulticastDelegate class.
4. The method that can be called using del should not be a static method.
5. The del class will contain a one-argument constructor and an lnvoke() method.
Options
A. 1, 2 and 3 only
B. 1, 3 and 5 only
C. 2 and 4 only
D. 4 only
E. All of the above

Discuss

8. In which of the following areas are delegates commonly used?
1. Remoting
2. Serialization
3. File Input/Output
4. Multithreading
5. Event handling
Options
A. 1 and 2 only
B. 1 and 5 only
C. 1, 2 and 3 only
D. 4 and 5 only
E. All of the above

Discuss

9. Which of the following statements is incorrect about delegate?
Options
A. Delegates are reference types.
B. Delegates are object oriented.
C. Delegates are type-safe.
D. Delegates serve the same purpose as function pointers in C and pointers to member function operators in C++.
E. Only one method can be called using a delegate.

Discuss

10. Which of the following is the necessary condition for implementing delegates?
Options
A. Class declaration
B. Inheritance
C. Run-time Polymorphism
D. Exceptions
E. Compile-time Polymorphism

Discuss

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

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

Interfaces problems

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