worker1.setMainManager(manager1);
worker2.setMainManager(manager1);
worker3.setMainManager(manager2);
Secretary sec1 = new Secretary("Durand Luc", 27, "Tetra Pack", 12);
Secretary sec2 = new Secretary("Serve Amandine", 34, "Tetra Pack", 10);
Collection employees = new ArrayList();
employees.add(employee1);
employees.add(employee2);
employees.add(worker1);