Question 1

A class with MustOverride methods does not necessarily have to be a MustInherit class.

Accepted Answer

A) True 
 B)False

Question 2

A method must be declared __________ for it to be overridden by derived classes.

Accepted Answer

A) Overrides 
B) Overridable 
C) Virtual 
D) None of the above 
A) Overrides 
B) Overridable 
C) Virtual 
D) None of the above

Question 3

With Protected instance variables in the base class,all the derived classes of the base class may need to be modified if the base-class implementation changes.In such a case,the software is said to be non-modifiable,because a small change in the base class can "break" derived-class implementations.

Accepted Answer

A) True 
 B)False

Question 4

Interfaces can have__________ methods.

Accepted Answer

A) 0 
B) 1 
C) 2 
D) any number of 
A) 0 
B) 1 
C) 2 
D) any number of

Question 5

In practice,derived classes should depend only on the base-class services (that is,Private methods and properties)and not on the base-class data implementation.

Accepted Answer

A) True 
 B)False

Question 6

An interface reference may invoke only the methods that the interface declares.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following statements about MustInherit base classes is true?

Accepted Answer

A) MustInherit base classes may contain data. 
B) MustInherit base classes may not contain implementations of methods. 
C) MustInherit base classes must declare all methods as MustOverride. 
D) MustInherit base classes must declare all data members not given values as MustOverride. 
A) MustInherit base classes may contain data. 
B) MustInherit base classes may not contain implementations of methods. 
C) MustInherit base classes must declare all methods as MustOverride. 
D) MustInherit base classes must declare all data members not given values as MustOverride.

Question 8

Objects of unrelated classes that implement the same interface can respond to the method calls of that interface polymorphically.

Accepted Answer

A) True 
 B)False

Question 9

Base class methods with this level of access cannot be called from derived classes.

Accepted Answer

A) Private 
B) Public 
C) Protected 
D) None of the above 
A) Private 
B) Public 
C) Protected 
D) None of the above

Question 10

The first task of any base class's constructor is to call its derived class's constructor.

Accepted Answer

A) True 
 B)False

Question 11

To avoid duplicating code (and possibly errors),use ________,rather than ________.

Accepted Answer

A) inheritance,the "copy-and-paste" approach 
B) the "copy-and-paste" approach,inheritance 
C) a class that explicitly extends Object,a class that does not extend Object 
D) a class that does not extend Object, a class that explicitly extends Object 
A) inheritance,the "copy-and-paste" approach 
B) the "copy-and-paste" approach,inheritance 
C) a class that explicitly extends Object,a class that does not extend Object 
D) a class that does not extend Object, a class that explicitly extends Object

Question 12

A derived class can add its own instance variables,Shared variables,properties and methods,and it can customize methods and properties it inherits.

Accepted Answer

A) True 
 B)False

Question 13

Polymorphism allows you to command a wide variety of objects of types related by inheritance as long as you know the objects' types.

Accepted Answer

A) True 
 B)False

Question 14

When a derived-class member overrides a base-class member,the base-class member can be accessed from the derived-class by using the Visual Basic keyword .

Accepted Answer

A) MyBase 
B) Top 
C) Super 
D) None of the above 
A) MyBase 
B) Top 
C) Super 
D) None of the above

Question 15

When creating a class,rather than declaring completely new members,you can designate that the new class inherits the members of an existing class.The existing class is called the __________ class,and the new class is the __________ class.

Accepted Answer

A) derived,base 
B) root,child 
C) sub,super 
D) base,derived 
A) derived,base 
B) root,child 
C) sub,super 
D) base,derived

Question 16

An interface is defined with keyword _________.

Accepted Answer

A) Interface 
B) MustInherit 
C) Implements 
D) Abstract 
A) Interface 
B) MustInherit 
C) Implements 
D) Abstract

Question 17

How can a derived class constructor ccall a base class constructor?

Accepted Answer

A) implicitly 
B) explicitly 
C) a and b 
D) the derived class cannot call the base class constructor 
A) implicitly 
B) explicitly 
C) a and b 
D) the derived class cannot call the base class constructor

Question 18

Concrete classes provide implementations for at least one of the methods and properties they define.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following does not complete the sentence correctly? 
An interface _____________.

Accepted Answer

A) forces classes that implement it to declare all the interface methods. 
B) is used in place of an MustInherit class when there is no default implementation to inherit. 
C) cannot be instantiated. 
D) can be instantiated. 
A) forces classes that implement it to declare all the interface methods. 
B) is used in place of an MustInherit class when there is no default implementation to inherit. 
C) cannot be instantiated. 
D) can be instantiated.

Question 20

The UML distinguishes an interface from other classes by placing the word "interface" in__________ above the interface name.

Accepted Answer

A) italics 
B) carets 
C) guillemets 
D) bold 
A) italics 
B) carets 
C) guillemets 
D) bold

Exam 10: Object-Oriented Programming: Inheritance

A class with MustOverride methods does not necessarily have to be a MustInherit class.

A method must be declared __________ for it to be overridden by derived classes.

With Protected instance variables in the base class,all the derived classes of the base class may need to be modified if the base-class implementation changes.In such a case,the software is said to be non-modifiable,because a small change in the base class can "break" derived-class implementations.

Interfaces can have__________ methods.

In practice,derived classes should depend only on the base-class services (that is,Private methods and properties)and not on the base-class data implementation.

An interface reference may invoke only the methods that the interface declares.

Which of the following statements about MustInherit base classes is true?

Objects of unrelated classes that implement the same interface can respond to the method calls of that interface polymorphically.

Base class methods with this level of access cannot be called from derived classes.

The first task of any base class's constructor is to call its derived class's constructor.

To avoid duplicating code (and possibly errors),use ________,rather than ________.

A derived class can add its own instance variables,Shared variables,properties and methods,and it can customize methods and properties it inherits.

Polymorphism allows you to command a wide variety of objects of types related by inheritance as long as you know the objects' types.

When a derived-class member overrides a base-class member,the base-class member can be accessed from the derived-class by using the Visual Basic keyword .

When creating a class,rather than declaring completely new members,you can designate that the new class inherits the members of an existing class.The existing class is called the __________ class,and the new class is the __________ class.

An interface is defined with keyword _________.

How can a derived class constructor ccall a base class constructor?

Concrete classes provide implementations for at least one of the methods and properties they define.

Which of the following does not complete the sentence correctly? An interface _____________.

The UML distinguishes an interface from other classes by placing the word "interface" in__________ above the interface name.

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To avoid duplicating code (and possibly errors),use ,rather than .

When creating a class,rather than declaring completely new members,you can designate that the new class inherits the members of an existing class.The existing class is called the class,and the new class is the class.