Chapter 5, Problem 8E

Explanation of Solution

a.

Method heading for each method:

• • Method heading for access method of each attribute:
  • ○ Access method for person first name is “public String getPersonFirstName()”.
  • ○ Access method for person last name is “public String getPersonLastName()”.
  • ○ Access method for person email address name is “public String getPersonEmailAddress()”...

Explanation of Solution

b.

Preconditions and postconditions of each method:

• • Precondition and postcondition of access method for each attribute.
  • ○ For method “getPersonFirstName()”:
    • ■ Precondition: None
    • ■ Postcondition: Returns the first name of given person.
  • ○ For method “getPersonLastName()”:
    • ■ Precondition: None
    • ■ Postcondition: Returns the last name of given person.
  • ○ For method “getPersonEmailAddress()”:
    • ■ Precondition: None
    • ■ Postcondition: Returns the email address of given person.
  • ○ For method “getPersonTelephoneNumber()”:
    • ■ Precondition: None
    • ■ Postcondition: Returns the telephone number of given person.
• • Precondition and postcondition of “changeEmailAddress(String nEmail)” method...

Explanation of Solution

c.

Test class for some Java statement:

//Create object "p1" for "PersonAddress" class

PersonAddress p1 = new PersonAddress();

//Create object "p2" for "PersonAddress" class

PersonAddress p2 = new PersonAddress();

//Create object "p3" for "PersonAddress" class

PersonAddress p3 = new PersonAddress();

//Set values for "p1" by calling method "setPersonAddress"

p1.setPersonAddress("John", "Merry", "john123@aaa.com", "123-4567");

//Set values for "p2" by calling method "setPersonAddress"

p2.setPersonAddress("John", "Merry", "jr@ccc.com", "123-7654");

//Set values for "p3" by calling method "setPersonAddress"

p3.setPersonAddress("Jansi", "Rose", "htr@aaa.com", "333-4444");

//Display the statement

System.out.println("Values of attributes for person 1.");

//Display person "p1" first name by calling method "getPersonFirstName"

System.out.println("First Name: " + p1.getPersonFirstName());

//Display person "p1" last name by calling method "getPersonLastName"

System.out.println("Last Name: " + p1.getPersonLastName());

//Display person "p1" email address by calling method "getPersonEmailAddress"

System.out.println("Email Address: " + p1.getPersonEmailAddress());

//Display person "p1" telephone number by calling method "getPersonTelephoneNumber"

System.out.println("Telephone Number: " + p1.getPersonTelephoneNumber());

System.out.println();

//Display the given statement

System...

Explanation of Solution

d.

Implementation of class:

PersonAddress.java:

//Import package

import java.util.Scanner;

//Define class "PersonAddress"

public class PersonAddress

{

//Declare required variables in "private" access specifier

    private String first_Name;

    private String last_Name;

    private String email_addr;

    private String telephone_number;

    //Set value for "PersonAddress" class

public void setPersonAddress(String f, String l, String e, String p)

    {

        //Assign value to given instance variables

        first_Name = f;

        last_Name = l;

        email_addr = e;

        telephone_number = p;

    } 

    //Access method for person first name

    public String getPersonFirstName()

    {

        //Returns person first name

        return first_Name;

    }

    //Access method for person last name

    public String getPersonLastName()

    {

        //Returns person last name

        return last_Name;

    }

    //Access method for person email address

    public String getPersonEmailAddress()

    {

        //Returns person email address

        return email_addr;

    }

    //Access method for person telephone number

    public String getPersonTelephoneNumber()

    {

        //Returns person telephone number

        return telephone_number;

    }

    //Method for change person Email Address

    public void changeEmailAddress(String nEmail)

    {

        //Assign "email_addr" to "nEmail"

        email_addr = nEmail;

    }

    //Method for change person PhoneNumber

    public void changePhoneNumber(String nPhone)

    {

        //Assign "telephone_number" to "nPhone"

        telephone_number = nPhone;

    }

    //Method for check two persons are equal

    public boolean equalMethod(PersonAddress otherPerson)

    {

        //Returns true if persons are equal

return last_Name.equals(otherPerson.last_Name) && first_Name.equals(otherPerson.first_Name);

    }

    //Define main function

    public static void main(String[] args)

    {

        //Create object "p1" for "PersonAddress" class

        PersonAddress p1 = new PersonAddress();

        //Create object "p2" for "PersonAddress" class

        PersonAddress p2 = new PersonAddress();

        //Create object "p3" for "PersonAddress" class

        PersonAddress p3 = new PersonAddress();

//Set values for "p1" by calling method "setPersonAddress"

p1.setPersonAddress("John", "Merry", "john123@aaa.com", "123-4567");

//Set values for "p2" by calling method "setPersonAddress"

p2.setPersonAddress("John", "Merry", "jr@ccc.com", "123-7654");

//Set values for "p3" by calling method "setPersonAddress"

p3.setPersonAddress("Jansi", "Rose", "htr@aaa.com", "333-4444");

        //Display the statement

System.out.println("Values of attributes for person 1.");

//Display person "p1" first name by calling method "getPersonFirstName"

System.out.println("First Name: " + p1.getPersonFirstName());

//Display person "p1" last name by calling method "getPersonLastName"

System.out.println("Last Name: " + p1.getPersonLastName());

//Display person "p1" email addressby calling method "getPersonEmailAddress"

System...