// Fig. 9.16: Employee.java
// Abstract base class Employee.

public abstract class Employee {
   private String firstName;
   private String lastName;

   // constructor
   public Employee( String first, String last )
   {
      firstName = first;
      lastName = last;
   }
   
   // get first name
   public String getFirstName() 
   { 
      return firstName; 
   }

   // get last name
   public String getLastName()
   { 
      return lastName; 
   }

   public String toString()
   { 
      return firstName + ' ' + lastName; 
   }

   // Abstract method that must be implemented for each 
   // derived class of Employee from which objects 
   // are instantiated.
   public abstract double earnings(); 

}  // end class Employee


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