Objectives: Java allows for a quick and easy way to implement map data structures while programming. Maps are helpful as data is stored in a key$-$value pair, making it easy and fast to access data. Java also provides the ability to override methods, including methods such as the equals$()$ and toString$()$ methods in classes. Completing this assignment students demonstrate knowledge of:

Creating Maps

Adding elements to maps

Overriding toString$(),$ equals$()$ and hashCode$()$

Task Description: A company that develops phones has hired you to create a contact system. The company wants each contact object to having a name, phone number $($hash map where keys are home, cell, and office$),$ street address, and email. They have specified that they do not want to have duplicate names inside of the contact list. You have decided to implement this with a HashMap where the key will be the contact's name, and the value will be a contact object.

Implement the following functionality:

Add new contact.

a$.$ Adds a contact to the system.

b$.$ A contact is new if its name is not already associated with a contact.

c$.$ If the user attempts to create a contact with a name already associated with a contact an appropriate message should be output and the user should be returned to the menu.

Edit existing contact.

a$.$ Allows the user to modify a contact already in the system.

b$.$ Allow the user to modify the contact's name.

i$.$ The map should be updated accordingly when the contact's name is changed.

c$.$ Implement editing at least one of the three phone numbers, the street address, or the email address of the contact.

List all contacts and print one to the console.

a$.$ Allow the user to choose a contact to print to the console.

b$.$ Override toString$()$ method to print to the console.

Contacts should be entered manually. Since there is a manual entry, there should be a check that makes sure that contact does not already exist. You should use the equals$()$ method to make sure an entry of a contact does not exist before adding their object to the map. This means that you will need to override this inside of the contact's class.