In this Java code i focus on Classes and objects, inheritance, polymorphism, File IO; nothing really fancy or speacial.

The purpose of this project is to give students exposure to object oriented design and programming using classes and polymorphism in an application that involves arrays of objects and sorting arrays containing objects. You will write several classes for Program 6. Please submit all classes in one file. The name of the physical program file submitted xxxx program6, where xxxx is your Kean email id Assignment: Best Office Supplies Inc, an office supply store, services many customers. As customers orders for office supplies are shipped, information is entered into a file. Best Office Supplies bills their customers once each month. At the end of each month, the Chief Executive Officer requests a report of all customers sorted by their customer id (from lowest to highest). The report includes their bill balance and tax liability. Write a program to produce the outstanding balance report sorted by customer ID number from the data in the text file Below is a description of the information on the text file, custlist.txt: The first line on the file contains the number of customers on the file (numeric) The fields below repeat for each customer: o Customer name (String) o Customer ID (numeric integer) o Bill balance (numeric) o EmailAddress (String) o Tax liability (numeric or String) The customers served by the office supply store are of two types: tax-exempt or non-tax- exempt. For a tax-exempt customer, the tax liability field on the file is the reason for the tax exemptions: education, non-profit, government, other (String). For a non-tax exempt customer, the tax liability field is the percent of tax that the customer will pay (numeric) based on the state where the customer's business resides From the information provided, write a solution that includes the following: A suitable inheritance hierarchy which represents the customers serviced by the office supply company. It is up to you how to design the inheritance hierarchy. I suggest a Customer class and appropriate subclasses. For all classes include the following: o Instance variables