You have been tasked to develop an application that reads customer information from a file to determine in which states you have customers.
The file contains records with customer first name, customer last name, street address, city, and state.
The file could contain many customers living in the same state. You need to read all of the records from the file and store only the state information into a data structure without duplicates. The states need to be sorted alphabetically.
Refer to Collections in the Sun Java API Documentation. Determine which Collection implementation would be the best choice for your application.
Write an application that will satisfy the requirements of the stated application and test that it works. Write an essay that justifies your choice of Collection class used.