// Fig. 9.13: BasePlusCommissionEmployee4.java
// BasePlusCommissionEmployee4 class inherits from CommissionEmployee3 and
// accesses CommissionEmployee3's private data via CommissionEmployee3's 
// public methods.

public class BasePlusCommissionEmployee4 extends CommissionEmployee3
{
   private double baseSalary; // base salary per week

   // six-argument constructor
   public BasePlusCommissionEmployee4( String first, String last, 
      String ssn, double sales, double rate, double salary )
   {
      super( first, last, ssn, sales, rate );
      setBaseSalary( salary ); // validate and store base salary
   } // end six-argument BasePlusCommissionEmployee4 constructor
   
   // set base salary
   public void setBaseSalary( double salary )
   {
      baseSalary = ( salary < 0.0 ) ? 0.0 : salary;
   } // end method setBaseSalary

   // return base salary
   public double getBaseSalary()
   {
      return baseSalary;
   } // end method getBaseSalary

   // calculate earnings
   public double earnings()
   {
      return getBaseSalary() + super.earnings();
   } // end method earnings

   // return String representation of BasePlusCommissionEmployee4
   public String toString()
   {
      return String.format( "%s %s\n%s: %.2f", "base-salaried", 
         super.toString(), "base salary", getBaseSalary() );
   } // end method toString
} // end class BasePlusCommissionEmployee4


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