A class instance is created dynamically in the GetEmployee() method of the Dept to find employees based on the first and last name in the ttEmployee temp-table. If an employee is found, it should cast the EmpRef field and return the Emp instance. If an employee is not found, it should return unknown. Once the object reference is cast to the correct type, you can execute any method of that instance.

method public Emp GetEmployee(input pFirstName as character, input pLastName as character):
  find first ttEmployee where ttEmployee.FirstName = pFirstName and
    ttEmployee.LastName = pLastName.
  if available (ttEmployee)
    then
      return cast(ttEmployee.EmpRef,Emp).
    else
      return ?.
end method.