public static void mapping() {
System.out.println( "***************Mapping*****************");
//create a department
Department department = new Department("Sales");
//create a manager
Manager manager = new Manager("Young Emy", department);
//link the manager to the department
department.setManager(manager);
//create employees
Employee employee1 = new Employee("Truffaz Brad", manager);
Employee employee2 = new Employee("Serio Laura", manager);