Quiz: Quiz 9


Quiz 9Online version c# Q's by Guadalupe Lliguicota 1 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 2 A superclass contains all the fields and methods of its subclasses as well as its own more specific fields and methods. a True b False c d 3 If a base class and a derived class have methods with the same names but different parameter lists, the derived class method overrides the base class method. a True b False c d 4 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 5 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 6 When using a derived class that contains a method that overrides a parent class method, what keyword can you use to access the parent class method from within the derived class? a upper b base c super d parent 7 What kind of a class might be considered to be "fragile"? a A class that depends on field names from parent classes. b A built in class that is overloaded. c A class that depends on being passed parameters from another method. d A class that has no destructor method. 8 What keyword always refers to the superclass of the class in which you use it? a base b super c parent d upper 9 A class's ToString() method is often a useful debugging aid. a True b False c d 10 What statement regarding the use of the Object class and classes in general is accurate? a All classes inherit the Object class methods. b When you create any child class, no inheritance occurs automatically. 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. 11 You can assign a derived class object to an object of any of its superclass types. When you do, what type of conversion occurs from the derived class to base class? a implicit b explicit c real d strong 12 What object class method returns a string that holds the name of the class, just as GetType() does? a Equals() b GetHashCode() c GetName() d ToString() 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 static access modifier. b The class has a private access modifier. c The class has an internal access modifier. d The class has a protected access modifier. 14 System.Console is an example of a class that can't be extended. What is the reason for this? a The class has a static access modifier. b The class has a private access modifier. c The class has an internal access modifier. d The class has a protected access modifier. 15 Besides the new keyword, what keyword can you use when defining a derived class member that has the same name as a base class member? a override b cast c hide d overload 16 In C#, any class you create is derived from what single built-in class? a System.Console b System.Console c System.Class d Object.System 17 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 abstract b concrete c concrete d overridden 18 When you use information hiding by selecting which properties and methods of a class to make public, you are assured that your data will be altered only by the properties and methods you choose and only in ways that you can control. a True b False c d 19 What is another name for a derived class in the C# programming language? a child class b parent class c second class d base class 20 When a class inherits from a base class, it is known as what type of class? a derived class b base class c superclass d parent class 21 What happens to a base class member in a derived class that is not hidden by the derived class? a It will be visible to the derived class. b It is overridden by the derived class. c It is removed from the derived class. d It will be eliminated from the derived class. 22 What term is synonymous with a derived class? a subclass b parent class c superclass d base class 23 What keyword is an alias for the System.Object class? a object b base c super d parent 24 The Equals() method compares two objects and returns true if they have the same value. a True b True c d 25 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 GetHashCode() b CalcHash() c GetHashGen() d ToHash() Feedback 1 Correct. A hash code is sometimes called a "fingerprint" for an object because it uniquely identifies the object. 2 Correct. Any subclass contains all the fields, properties, and methods of its superclass as well as its own more specific ones. 3 Correct. If a base class and a derived class have methods with the same names but different parameter lists, then the derived class method does not override the base class method; instead, it overloads the base class method. 4 Correct. An abstract class is one from which you cannot create concrete objects but from which you can inherit. 5 Correct. Multiple inheritance is the ability to inherit from more than one class. 9 Correct. A class’s ToString() method is often a useful debugging aid. 10 Correct. Because all classes inherit from the Object class, all classes inherit the Object class methods. 11 Correct. An implicit reference conversion occurs when a derived class object is assigned to its ancestor’s data type. 13 Correct. Classes that are not intended to be instantiated and that contain only static members are declared as static classes. You cannot extend static classes. 14 Correct. Classes that are not intended to be instantiated and that contain only static members are declared as static classes. You cannot extend static classes. 15 Correct. When you create a derived class that inherits an abstract method from a parent, you must use the keyword override in the method header and provide the actions, or implementation, for the inherited method within the derived class. 16 Correct. Every class you create in C# derives from a single class named System.Object. 17 Correct. An abstract method has no method statements. Any class derived from a class that contains an abstract method must override the abstract method by providing a body (an implementation) for it. 18 Correct. When you use information hiding, you are assured that your data will be altered only by the properties and methods you choose and only in ways that you can control. 19 Correct. A child class is a derived class. 20 Correct. A derived class or extended class is one that has inherited from a base class. 21 Correct. A base class member that is not hidden by the derived class is visible in the derived class. 22 Correct. A subclass is a derived class. 23 Correct. The keyword objectis an alias for the System.Object class. 24 Correct. The Equals() method returns true if two objects have the same memory address—that is, if one object is a reference to the other and both are literally the same object. 25 Correct. GetHashCode() gets a unique code for each object. It is useful in certain sorting and data management tasks.

1

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

2

A superclass contains all the fields and methods of its subclasses as well as its own more specific fields and methods.

a

True

b

False

c

d

3

If a base class and a derived class have methods with the same names but different parameter lists, the derived class method overrides the base class method.

a

True

b

False

c

d

4

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

5

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

6

When using a derived class that contains a method that overrides a parent class method, what keyword can you use to access the parent class method from within the derived class?

a

upper

b

base

c

super

d

parent

7

What kind of a class might be considered to be "fragile"?

a

A class that depends on field names from parent classes.

b

A built in class that is overloaded.

c

A class that depends on being passed parameters from another method.

d

A class that has no destructor method.

8

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

a

base

b

super

c

parent

d

upper

9

A class's ToString() method is often a useful debugging aid.

a

True

b

False

c

d

10

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

a

All classes inherit the Object class methods.

b

When you create any child class, no inheritance occurs automatically.

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.

11

You can assign a derived class object to an object of any of its superclass types. When you do, what type of conversion occurs from the derived class to base class?

a

implicit

b

explicit

c

real

d

strong

12

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

a

Equals()

b

GetHashCode()

c

GetName()

d

ToString()

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 static access modifier.

b

The class has a private access modifier.

c

The class has an internal access modifier.

d

The class has a protected access modifier.

14

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

a

The class has a static access modifier.

b

The class has a private access modifier.

c

The class has an internal access modifier.

d

The class has a protected access modifier.

15

Besides the new keyword, what keyword can you use when defining a derived class member that has the same name as a base class member?

a

override

b

cast

c

hide

d

overload

16

In C#, any class you create is derived from what single built-in class?

a

System.Console

b

System.Console

c

System.Class

d

Object.System

17

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

abstract

b

concrete

c

concrete

d

overridden

18

When you use information hiding by selecting which properties and methods of a class to make public, you are assured that your data will be altered only by the properties and methods you choose and only in ways that you can control.

a

True

b

False

c

d

19

What is another name for a derived class in the C# programming language?

a

child class

b

parent class

c

second class

d

base class

20

When a class inherits from a base class, it is known as what type of class?

a

derived class

b

base class

c

superclass

d

parent class

21

What happens to a base class member in a derived class that is not hidden by the derived class?

a

It will be visible to the derived class.

b

It is overridden by the derived class.

c

It is removed from the derived class.

d

It will be eliminated from the derived class.

22

What term is synonymous with a derived class?

a

subclass

b

parent class

c

superclass

d

base class

23

What keyword is an alias for the System.Object class?

a

object

b

base

c

super

d

parent

24

The Equals() method compares two objects and returns true if they have the same value.

a

True

b

True

c

d

25

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

GetHashCode()

b

CalcHash()

c

GetHashGen()

d

ToHash()

Feedback

1

Correct. A hash code is sometimes called a "fingerprint" for an object because it uniquely identifies the object.

2

Correct. Any subclass contains all the fields, properties, and methods of its superclass as well as its own more specific ones.

3

Correct. If a base class and a derived class have methods with the same names but different parameter lists, then the derived class method does not override the base class method; instead, it overloads the base class method.

4

Correct. An abstract class is one from which you cannot create concrete objects but from which you can inherit.

5

Correct. Multiple inheritance is the ability to inherit from more than one class.

9

Correct. A class’s ToString() method is often a useful debugging aid.

10

Correct. Because all classes inherit from the Object class, all classes inherit the Object class methods.

11

Correct. An implicit reference conversion occurs when a derived class object is assigned to its ancestor’s data type.

13

Correct. Classes that are not intended to be instantiated and that contain only static members are declared as static classes. You cannot extend static classes.

14

Correct. Classes that are not intended to be instantiated and that contain only static members are declared as static classes. You cannot extend static classes.

15

Correct. When you create a derived class that inherits an abstract method from a parent, you must use the keyword override in the method header and provide the actions, or implementation, for the inherited method within the derived class.

16

Correct. Every class you create in C# derives from a single class named System.Object.

17

Correct. An abstract method has no method statements. Any class derived from a class that contains an abstract method must override the abstract method by providing a body (an implementation) for it.

18

Correct. When you use information hiding, you are assured that your data will be altered only by the properties and methods you choose and only in ways that you can control.

19

Correct. A child class is a derived class.

20

Correct. A derived class or extended class is one that has inherited from a base class.

21

Correct. A base class member that is not hidden by the derived class is visible in the derived class.

22

Correct. A subclass is a derived class.

23

Correct. The keyword objectis an alias for the System.Object class.

24

Correct. The Equals() method returns true if two objects have the same memory address—that is, if one object is a reference to the other and both are literally the same object.

25

Correct. GetHashCode() gets a unique code for each object. It is useful in certain sorting and data management tasks.

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Quiz 9

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Quiz 9Online version

by Guadalupe Lliguicota

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

A superclass contains all the fields and methods of its subclasses as well as its own more specific fields and methods.

If a base class and a derived class have methods with the same names but different parameter lists, the derived class method overrides the base class method.

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

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

When using a derived class that contains a method that overrides a parent class method, what keyword can you use to access the parent class method from within the derived class?

What kind of a class might be considered to be "fragile"?

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

A class's ToString() method is often a useful debugging aid.

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

You can assign a derived class object to an object of any of its superclass types. When you do, what type of conversion occurs from the derived class to base class?

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

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

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

Besides the new keyword, what keyword can you use when defining a derived class member that has the same name as a base class member?

In C#, any class you create is derived from what single built-in class?

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?

When you use information hiding by selecting which properties and methods of a class to make public, you are assured that your data will be altered only by the properties and methods you choose and only in ways that you can control.

What is another name for a derived class in the C# programming language?

When a class inherits from a base class, it is known as what type of class?

What happens to a base class member in a derived class that is not hidden by the derived class?

What term is synonymous with a derived class?

What keyword is an alias for the System.Object class?

The Equals() method compares two objects and returns true if they have the same value.

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