// Fig. 9.9: 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;
   }
   
   // Return the first name
   public String getFirstName() { return firstName; }

   // Return the 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(); 
}

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