_____                      _ _    _____                  _____ _             _       
 |  __ \                    | | |  / ____|                / ____| |           | |      
 | |__) |_ _ _   _ _ __ ___ | | | | |     __ _ ___  ___  | (___ | |_ _   _  __| |_   _ 
 |  ___/ _` | | | | '__/ _ \| | | | |    / _` / __|/ _ \  \___ \| __| | | |/ _` | | | |
 | |  | (_| | |_| | | | (_) | | | | |___| (_| \__ \  __/  ____) | |_| |_| | (_| | |_| |
 |_|   \__,_|\__, |_|  \___/|_|_|  \_____\__,_|___/\___| |_____/ \__|\__,_|\__,_|\__, |
              __/ |                                                               __/ |
             |___/                                                               |___/ 

This is a Java version of the famous Uncle Bob's Payroll Case Study.

This demonstrates how the core of a software system can be designed without having a database of network layer.