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