Deck 10: Inheritance and Polymorphism

Question 1

When you want to make sure a specific constructor from the base class is used, the derived class constructor must explicitly call the base class constructor using the ____________.

A) base keyword
B) const keyword
C) Override method
D) out parameter

Answer 1

A

Question 2

Which one of the following is a class header indicating that we are defining a class named Amphibian, and it is derived from the Animal class?

A) Amphibian : Animal
B) Animal(Amphibian)
C) Animal->Amphibian
D) Amphibian

Answer 2

A

Question 3

A(n) ____________ is a method that appears in a base class but expects to be overridden in a derived class.

A) shadow method
B) base method
C) derived method
D) abstract method

Answer 3

D

Question 4

A regular class is sometimes called a(n) ____________.

A) concrete class
B) base class
C) derived class
D) abstract class

Question 5

The ____________ declares that a method in the derived class overrides a method in the base class.

A) override keyword
B) void keyword
C) new keyword
D) virtual keyword

Question 6

Base classes are sometimes called superclasses, and derived classes are sometimes called ____________.

A) planned classes
B) copy classes
C) derivatives
D) subclasses

Question 7

The ____________ inherits fields, properties, and methods from the base class without any of them having to be rewritten.

A) super instance
B) derived class
C) initialized object
D) copy class

Question 8

A class that is not intended to be instantiated but is to be used only as a base class is called a(n) ____________.

A) abstract class
B) dummy class
C) placeholder
D) entity class

Question 9

The term ____________ refers to an object's ability to take different forms.

A) adaptation
B) polymorphism
C) portability
D) code reuse

Question 10

A(n) ____________ is a property that appears in a base class but expects to be overridden in a derived class.

A) base property
B) abstract property
C) derived property
D) public property

Question 11

When a derived class method has the same name as a base class method, it is often said that the derived class method ____________ the base class method.

A) shadows
B) mimics
C) overrides
D) terminates

Question 12

To allow a property to be overridden in the ____________ you write the virtual keyword in the property declaration.

A) class header
B) derived class
C) base class
D) class constructor

Question 13

Which one of the following is a specialized version of a general food substance?

A) pizza
B) chocolate
C) ice cream
D) all of these

Question 14

To override the property in the ____________ you write the override keyword in the property declaration.

A) parameterized constructor
B) base class
C) field declaration
D) derived class

Question 15

The ____________ is the general class.

A) starting object
B) default design
C) base class
D) derived class

Question 16

A base class reference variable knows only about the members that are declared in the ____________.

A) derived class
B) base class
C) method header
D) parameterless constructor

Question 17

To declare a class as abstract, you use the ____________ in the class header.

A) void keyword
B) new keyword
C) abstract keyword
D) static keyword

Question 18

In object oriented programming, ____________ is used to create an "is a" relationship among classes.

A) inheritance
B) progression
C) logic
D) elimination

Question 19

The ____________ declares that a derived class is allowed to override a method in the base class.

A) override keyword
B) class keyword
C) virtual keyword
D) static keyword

Question 20

When one object is a specialized version of another object, there is a(n) ____________ between them.

A) 1:1 ratio
B) "is a" relationship
C) common bond
D) shared interest

Question 21

When designing an object-oriented program, the best approach is to write a base class to hold all the general data about an object and then write derived classes for each specific type of object.

Question 22

Inheritance involves a base class and a relative class.

Question 23

Properties in a base class can be overridden in the same way that methods can be overridden.

Question 24

If a base class object is used to call an overridden method, then the derived class's version of the method is the one that executes.

Question 25

A method that accepts a base class variable as a parameter cannot accept a derived class variable as a parameter.

Question 26

A class that is not intended to be instantiated but is to be used only as a base class is called a concrete class.

Question 27

A statement that tries to use the new operator instantiate an abstract class will not compile.

Question 28

If the derived class introduces additional methods, properties, or fields, as base class reference variable cannot access them.

Question 29

In the real world you can find many objects that are specialized versions of more general objects.

Question 30

You cannot assign a base class reference to a derived class variable.

Question 31

New fields, properties, and methods cannot be added to the derived class.

Question 32

You can think of the derived class as an extended version of the base class.

Question 33

When you create a derived class, the base class constructor is executed first, and then the derived class constructor is executed.

Question 34

Only methods in the derived class can directly access the base class's private members.

Question 35

If you want to create an abstract read-only property, leave out the set accessor.

Question 36

When an "is a" relationship exists between objects, it means that the specialized object has all of the characteristics of the general object, plus additional characteristics that make it special.

Question 37

If the base class does not have a parameterless constructor, the derived class constructor must use the notation: base(parameterList) to call one of the base class's parameterized constructors.