a.

Method heading for each method:

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

b.

Preconditions and postconditions of each method:

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

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...

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...