Abstract class : An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed. Legal abstract class : The conditions for a class to be considered as legal abstract class are mentioned below: If a class includes abstract methods, then the class must be declared as abstract. The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon. Interface: Interface is a reference type in Java, which contains a collection of abstract methods. An interface needs to the follow certain conditions such as: One cannot instantiate an interface. Interfaces do not contain any constructors. All methods present in the interface are abstracts. An interface does not contain any instance field. An interface cannot be extended by a class.

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Answer 1

Question

Chapter 13.8, Problem 13.8.3CP

a)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

b)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

c)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

d)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

e)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

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Answer 2

Question

Chapter 13.8, Problem 13.8.3CP

a)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

b)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

c)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

d)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

e)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

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Answer 3

Question

Chapter 13.8, Problem 13.8.3CP

a)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

b)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

c)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

d)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

e)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

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Answer 4

Question

Chapter 13.8, Problem 13.8.3CP

a)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

b)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

c)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

d)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

e)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Expert Solution & Answer

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See solution

Answer 5

Chapter 13.8, Problem 13.8.3CP

a)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

b)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

c)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

d)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

e)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 6

Chapter 13.8, Problem 13.8.3CP

a)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 7

Chapter 13.8, Problem 13.8.3CP

a)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 8

b)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 9

b)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 10

c)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 11

c)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 12

d)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 13

d)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 14

e)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 15

e)

Program Plan Intro

Abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

If a class includes abstract methods, then the class must be declared as abstract.

The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class.

Answer 16

Expert Solution & Answer

Answer 17

Expert Solution & Answer

Answer 18

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Answer 19

Ch. 13.2 - Prob. 13.2.1CP Ch. 13.2 - The getArea() and getPerimeter() methods may be...Ch. 13.2 - True or false? a.An abstract class can be used...Ch. 13.3 - Prob. 13.3.1CP Ch. 13.3 - Prob. 13.3.2CP Ch. 13.3 - Prob. 13.3.3CP Ch. 13.3 - What is wrong in the following code? (Note the...Ch. 13.3 - What is wrong in the following code? public class...Ch. 13.4 - Can you create a Calendar object using the...Ch. 13.4 - Prob. 13.4.2CP

Solution Summary: The author explains that an abstract class is a class which may or may not include abstract methods and cannot be instantiated but can be sub-classed.

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Chapter 13 Solutions