Please do in Java as simply as possible with comments so I can follow along. Please have the code available for copy :)

Write a class encapsulating the concept of a vendor, if a vendor has the following attributes: company name, id, array of quarterly purchase order totals (4 double elements). Include a constructor, accessor, mutator, and toString methods. Also code the following methods: one returning the total purchase orders (total all array elements) and a method to modify an array element (change the value of an array element). Write a client class to create 2 vendor objects and test all your methods.