I need this pseudocode and java please help.

//c. Lab Assignment 2A 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 array element). Write a client class to create 2 vendor objects and test all your methods. The java file should include a comment heading with your name, date, assignment name, brief description of the assignment and sources used to complete the assignment