Consider a class PersonAddress that represents an entry in an address book. Its attributes are

Question

• The first name of the person
• The last name of the person
• The e-mail address of the person
• The telephone number of the person
It will have methods to
• Access each attribute
• Change the e-mail address
• Change the telephone number
• Test whether two instances are equal based solely on name
a. Write a method heading for each method.
b. Write preconditions and postconditions for each method.
c. Write some Java statements that test the class.
d. Implement the class.

Answer 1

a)```
public String getFirstName()
public String getLastName()
public String getEmailAddress()
public String getPhoneNumber()
public void updateEmail(String newEmail)
public void updatePhone(String newPhone)
public boolean equal(PersonAddress otherPerson)
```

b)
public String getFirstName()
Precondition: none.
Postcondition: The first name was returned.

public String getLastName()
Precondition: none.
Postcondition: The last name was returned.

public String getEmailAddress()
Precondition: none.
Postcondition: The email address was returned.

public String getPhoneNumber()
Precondition: none.
Postcondition: The phone number was returned.


public void updateEmail(String newEmail)
Precondition: none.
Postcondition: The email address was changed to newEmail.


public void updatePhone(String newPhone)
Precondition: none.
Postcondition: The phone number was changed to newPhone.

public boolean equal(PersonAddress otherPerson)
Precondition: otherPerson is not null.
Postcondition: True was returned if the first and last names match.

c&d)
See the code in PersonAddress.java.