// CommissionWorker.java
// CommissionWorker類是 Employee類的繼承

public final class CommissionWorker extends Employee {
   private double salary;      // 每周的底薪
   private double commission;  // 每周獎金
   private int quantity;       // 銷售額

   // 普通員工類的構造函數
   public CommissionWorker( String first, String last,
                            double s, double c, int q)
   {
      super( first, last );  // 調用父類的構造函數
      setSalary( s );
      setCommission( c );
      setQuantity( q );
   }
   
   // 確定普通員工的每周底薪
   public void setSalary( double s )
      { salary = ( s > 0 ? s : 0 ); }
   
   // 確定普通員工的每周獎金
   public void setCommission( double c ) 
      { commission = ( c > 0 ? c : 0 ); }
   
   // 確定普通員工銷售額
   public void setQuantity( int q )
      { quantity = ( q > 0 ? q : 0 ); }
   
   // 確定普通員工的收入
   public double earnings()
      { return salary + commission * quantity; }
   
   // 打印普通員工的姓名
   public String toString() 
   {
      return "普通員工: " + super.toString();
   }
}