Java™ How To Program (Early Objects), Tenth Edition

10.5.2 Concrete Subclass SalariedEmployee

Class SalariedEmployee (Fig. 10.5) extends class Employee (line 4) and overrides abstract method earnings (lines 38–42), which makes SalariedEmployee a concrete class. The class includes a constructor (lines 9–19) that receives a first name, a last name, a social security number and a weekly salary; a set method to assign a new nonnegative value to instance variable weeklySalary (lines 22–29); a get method to return weeklySalary’s value (lines 3235); a method earnings (lines 38–42) to calculate a SalariedEmployee’s earnings; and a method toString (lines 45–50), which returns a String including "salaried employee: " followed by employee-specific information produced by superclass Employee’s toString ...