04 Inheritance, Polymorphism, and Interfaces

Question 1

It enables the use of existing class to define a new class.

Answer 1

Inheritance

Question 2

Is is defined by adding instance variables and methods to an existing class.

Answer 2

Derived class

Question 3

The derived class is also known as? (3)

Answer 3

subclass, child class, and descendant class.

Question 4

The existing class that the derived class is built upon.

Answer 4

Base class

Question 5

The base class is also known as? (3)

Answer 5

superclass, parent class, and ancestor class.

Question 6

A derived class is defined by starting with another defined class and by adding methods and instance variables. True or False?

Answer 6

True

Question 7

A derived class has its own constructors. It does not inherit any constructors from the base class. True or False?

Answer 7

True

Question 8

Keyword that is used that the default constructor that calls another in that class?

Answer 8

this

Question 9

A constructor can contain both super and this keyword.

Answer 9

False

Question 10

It is the ability of an object to take on many forms.

Answer 10

Polymorphism

Question 11

It allows many meanings to be associated to one method name?

Answer 11

Dynamic Binding

Question 12

It is used to specify methods that a class must implement. It contains headings for a number of public methods.

Answer 12

Interface

Question 13

An abstract class can be instantiated. True or False?

Answer 13

False

Question 14

An abstract class should always have an abstract method.

Answer 14

False

Question 15

It serves as a base class for subclasses. It may or may not include abstract methods.

Answer 15

Abstract class

Question 16

Interfaces can be instantiated. True or False?

Answer 16

False