17. An abstract Product class

• 
  public abstract class Product
  {
      private String code;
      private String description;
      private double price;
  
      // regular constructors and methods for instance 
      // variables
  
      @Override
      public String toString()
      {
          return "Code:        " + code + "\n" +
                 "Description: " + description + "\n" +
                 "Price:       " + this.getFormattedPrice()
                                 + "\n";
      }
  
      // an abstract method
      abstract String getDisplayText(); 
  }//class Product