National Refinery Limited (NRL) is one of the finest oil refineries, owns different departments including Administration Cell,
Sulphur byproducts Manufacturing Unit (SMU),
Sulphur Products Export (SPE),
Payroll Unit (PU).

As a Software Engineer, you have to design a GUI based NRL Production Gateway. In which design first scene for SignIn option in which there are many options to move their above mentioned departments.
•Make sure to include filing for storing login credentials and validate them from file.
•In Administration depart acquires the hiring of employee (ask various information name, id, qualification, age, experience, hiring date and store in separate file) and checks qualification and experience from filing then appoints different employees to respective department like as
Add yourself as Chemical Engineer with 3 years’ experience in Sulphur byproducts Manufacturing Unit
Add your father as MBA with 5 years’ experience in Sulphur Products Export
Add your brother as BCom/BBA with 1 year experience in Payroll Unit.
•Update their department in filing.
Create separate product class that involves in defininig makeProduct(Product), packProduct(Product) in SMU, tagProduct(Product), exportProduct(Product ) in SPE and calculatePayroll() for PU that enhance the business of company.

Assume necessary assumptions where required. Assume your own functionality for every method also test functionality after launching the application.