i need help creating java pseudocode and source code.

Write a class encapsulating the concept of a vendor for Kennesaw State University, 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 aray element). Write a client class to create 2 vendor objects and test all your metho ds