Deck 11: Inheritance

Question 1

The class at the highest level in a class diagram

A)is an abstract class.
B)points directly to all of its subclasses.
C)has definitions for all methods in the class hierarchy.
D)is the most general class in the class diagram.

Answer 1

D

Question 2

Which of the following is not an example of a generalization/specialization relationship?

A)vehicle/car
B)furniture/chair
C)food/groceries
D)building/fire station

Answer 2

C

Question 3

Another name for a subclass is a(n)

A)described class.
B)inherited class.
C)derived class.
D) parent class.

Answer 3

C

Question 4

If two methods in a class hierarchy have the same name,
A)the classes that contain them cannot be included in the same program.

A)the method name must be appended to the class name on invokation.
B)one method must have fewer parameters than the other to ensure uniqueness.
D)an object name must precede the method name when either method is invoked.

Question 5

How is generalization/specialization represented on a UML class diagram?

A)a solid line.
B)an unfilled arrow.
C)a filled diamond.
D)a dashed line.

Question 6

A tennis player is a kind of athlete is an example of

A)generalization/specialization.
B)class hierarchy.
C)polymorphism.
D)inheritance.

Question 7

Inheritance is

A)a mechanism that uses generalization/specialization relationships.
B)a mechanism for relating classes and objects.
C)a relationship that establishes levels in a class hierarchy.
D)a mechanism to share identifications and descriptions.

Question 8

Inheritance takes advantage of an existing generalization/specialization relationship.

Question 9

Classes that are not abstract classes are sometimes referred to as

A)base classes.
B)concrete classes.
C)superclasses.
D)inherited classes.

Question 10

Which of the following people was not involved in the definition of UML?

A)Harlan Mills
B)Ivar Jacobson
C)Grady Booch
D)Jim Rumbaugh

Question 11

A subclass cannot contain a data member that is not in its base class.

Question 12

An abstract class

A)has at least one method that is identified but not defined.
B) is defined in each class in which it appears.
C)has no constructor method.
D)has at least one data member that is not referenced during processing.

Question 13

A polymorphic method

A)has multiple implementations within the same class definition.
B)is uniquely identified by the data types of its arguments.
C)can be used in a subclass if it's not used in a base class.
D)has the same name as another method within the same class hierarchy.

Question 14

A subclass can contain a new design of an inherited method.

Question 15

When two constructors are given in a class,they execute in sequence during processing.

Question 16

The process of reimplementing in a subclass a method from the base class is called

A)overriding.
B)overloading.
C)polymorphism.
D)inheritance.

Question 17

What is another name for an "is-a"relationship?

A)composition
B)abstraction
C)generalization/specialization
D)kind-of/example

Question 18

When a subclass is created,processing proceeds as if

A)the subclass was itself a base class.
B)a call to the constructor of the base class were the first statement in the constructor for the subclass.
C)the subclass was the class at the top of the class hierarchy.
D)a call to the subclass's constructor had already occurred.

Question 19

A base class may also be called a(n)

A)superclass.
B)subclass.
C)derived class.
D)existent class.

Question 20

A subclass cannot inherit methods from another class at its same level.

Question 21

Developers often use inheritance to simplify and shorten their implementation tasks.

Question 22

A class definition may include a constructor or a destructor,but will not reasonably include both.

Question 23

Polymorphism is used extensively in commercial programming.

Question 24

A single driver program may instantiate two or more instances of the same class.

Question 25

Structured programming control structures do not apply in designing a class when inheritance is used.

Question 26

No objects can be created of a base class that is an abstract class.

Question 27

A single method invocation may contain constants or variables,but not both.

Question 28

When two classes have a generalization/specialization relationship,the more specific class may contain additional information.

Question 29

A single method can return values that are of different data types.

Question 30

A method in a subclass can invoke a method in its base class.