Question 1

Explain the sequence of constructors that will be called when you create an object that is an instance of a derived class.

Accepted Answer

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Question 2

A class that is able to inherit from more than one class utilizes what C# feature?
A) polymorphism
B) interfacing
C) collaboration
D) multiple inheritance

Accepted Answer

Multiple inheritance allows a class to inherit from more than one class.

Question 3

What method can you use to return a unique hash for different objects, so long as you explicitly implement it in a derived class?
A) CalcHash()
B) GetHashGen()
C) ToHash()
D) GetHashCode()

Accepted Answer

The GetHashCode() method is used to return a unique hash code for objects, and it can be explicitly implemented in a derived class to ensure uniqueness.

Question 4

What object class method returns a string that holds the name of the class, just as GetType() does?
A) GetHashCode()
B) Equals()
C) GetName()
D) ToString()

Accepted Answer

The ToString() method returns a string representation of the object, which typically includes the name of the class.

Question 5

What keyword always refers to the superclass of the class in which you use it?
A) super
B) parent
C) upper
D) base

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Question 6

The ability to inherit from more than one class is called multiple inheritance.C# prohibits multiple inheritance, but it does provide an alternative mechanism.Why is multiple inheritance prohibited, and what is the alternative that is provided?

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The answer of The ability to inherit from more than...

Question 7

What type of class is one from which you cannot create concrete objects, but from which you can inherit?
A) abstract
B) concrete
C) base
D) derived

Accepted Answer

An abstract class is a class that cannot be instantiated on its own and is meant to be subclassed, allowing other classes to inherit from it.

Question 8

Briefly describe the four public instance methods of the Object class.

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The answer of Briefly describe the four public instance methods...

Question 9

When all base class constructors require arguments, you must include a constructor for each derived class you create.Why?

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Question 10

Briefly describe the similarities and differences between abstract classes and interfaces.

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Question 11

What statement regarding the use of the Object class and classes in general is accurate?
A) When you create any child class, no inheritance occurs automatically.
B) All classes inherit the Object class methods.
C) The object class contains a constructor, destructor, and two public instance methods.
D) Although every class descends from Object, not all objects are Objects.

Accepted Answer

All classes in Java implicitly inherit from the Object class, which provides methods like toString(), equals(), and hashCode().

Question 12

What type of method has no method statements, and requires the use of an override statement for any class derived from a class that contains it?
A) concrete
B) overloaded
C) abstract
D) overridden

Accepted Answer

An abstract method has no implementation in the base class and must be overridden in any derived class.

Question 13

System.Console is an example of a class that can't be extended.What is the reason for this?
A) The class has a private access modifier.
B) The class has an internal access modifier.
C) The class has a static access modifier.
D) The class has a protected access modifier.

Accepted Answer

System.Console is a static class, and static classes cannot be extended or inherited in C#.

Question 14

In the event that a method that should be overridden in a child class has its own implementation, what should you declare the base class method to be?
A) abstract
B) virtual
C) valid
D) static

Accepted Answer

The base class method should be declared as "virtual" to allow it to be overridden in a derived class.

Question 15

Show an example of a class definition that creates a subclass of an existing Employee class, and adds a private double field called commissionRate.What is the total set of fields that an instance of the new class contains?

Accepted Answer

The answer of Show an example of a class definition...

Question 16

On some occasions, you might want to access parent class data from a child class.Declaring the parent class field as public would violate the principle of information hiding, but declaring it private would make it inaccessible.How can the proper level of security be achieved?

Accepted Answer

The answer of On some occasions, you might want to...

Question 17

What can be used as a type of "fingerprint" for an object, due to the fact that it is unique?
A) property
B) hash code
C) derived code
D) new property

Accepted Answer

A hash code is a unique identifier for an object, often used to quickly compare objects or store them in data structures like hash tables.

Question 18

What are the requirements for overloading the Object class's Equals() method?

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Question 19

Reusing existing classes and interfaces makes the job of programming easier.What are some of the future advantages that come from writing extendable base classes?

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Question 20

When a derived class contains a method or property that overrides a parent class method or property, how can you use the parent class version from within the subclass? Show an example of a derived class that overrides a parent class method, but then uses the parent class method.

Accepted Answer

The answer of When a derived class contains a method...

Quiz 10: Introduction to Inheritance

Explain the sequence of constructors that will be called when you create an object that is an instance of a derived class.

A class that is able to inherit from more than one class utilizes what C# feature?

What method can you use to return a unique hash for different objects, so long as you explicitly implement it in a derived class?

What object class method returns a string that holds the name of the class, just as GetType() does?

What keyword always refers to the superclass of the class in which you use it?

The ability to inherit from more than one class is called multiple inheritance.C# prohibits multiple inheritance, but it does provide an alternative mechanism.Why is multiple inheritance prohibited, and what is the alternative that is provided?

What type of class is one from which you cannot create concrete objects, but from which you can inherit?

Briefly describe the four public instance methods of the Object class.

When all base class constructors require arguments, you must include a constructor for each derived class you create.Why?

Briefly describe the similarities and differences between abstract classes and interfaces.

What statement regarding the use of the Object class and classes in general is accurate?

What type of method has no method statements, and requires the use of an override statement for any class derived from a class that contains it?

System.Console is an example of a class that can't be extended.What is the reason for this?

In the event that a method that should be overridden in a child class has its own implementation, what should you declare the base class method to be?

Show an example of a class definition that creates a subclass of an existing Employee class, and adds a private double field called commissionRate.What is the total set of fields that an instance of the new class contains?

On some occasions, you might want to access parent class data from a child class.Declaring the parent class field as public would violate the principle of information hiding, but declaring it private would make it inaccessible.How can the proper level of security be achieved?

What can be used as a type of "fingerprint" for an object, due to the fact that it is unique?

What are the requirements for overloading the Object class's Equals() method?

Reusing existing classes and interfaces makes the job of programming easier.What are some of the future advantages that come from writing extendable base classes?

When a derived class contains a method or property that overrides a parent class method or property, how can you use the parent class version from within the subclass? Show an example of a derived class that overrides a parent class method, but then uses the parent class method.