1. three additional features: EmployeeID (int), salary (as double) and hireYear (as int). 2. two constructors (default and one with 4 parameters). 3. four mutator methods (rest, setEmployeeID, setSalary, and setHireYear). 4. three accessor methods. 5. equals method. 6. toString method 7. EmployeeID and salary must be positive and hireYear must be greater than 1970..