Employee.java

Employee emp1 = new Employee(1,'Ann');
Employee emp2 = new Employee(2,'John');
Employee emp3 = new Employee(3,'Rex');

Map<Employee, String> myHashMap = new HashMap<>();

hashMap.put(emp1, 'IT');
hashMap.put(emp2, 'DEV');
hashMap.put(emp3, 'QA');
hashMap.put(null, 'QA');