The code for the ProductDB class
public class ProductDB
{
     public static Product getProduct(String productCode)
     {
           // In a more realistic application, this code would
           // get the data for the product from a file or database
           // For now, this code just uses if/else statements
           // to return the correct product data
           
           Product p = null;
           
           if (productCode.equalsIgnoreCase("java") ||
               productCode.equalsIgnoreCase("jsps") ||
               productCode.equalsIgnoreCase("mcb2"))
           {
               Book b = new Book();
               if (productCode.equalsIgnoreCase("java"))
               {
                    b.setCode(productCode);
                    b.setDescription("Murach's Beginning Java 2");
                    b.setPrice(49.50); 
                    b.setAuthor("Andrea Steelman");
               }
               else if (productCode.equalsIgnoreCase("jsps"))
               {
                    b.setCode(productCode);
                    b.setDescription("Murach's Java Servlets and JSP");
                    b.setPrice(49.50);
                    b.setAuthor("Andrea Steelman");
               }
               else if (productCode.equalsIgnoreCase("mcb2"))
               {
                    b.setCode(productCode);
                    b.setDescription("Murach's Mainframe COBOL");
                    b.setPrice(59.50);
                    b.setAuthor("Mike Murach"):
               }
               p = b;  // set Product variable equal to the Book object
           } 
           else if (productCode.equalsIgnoreCase("txtp"))
           {
              Software s = new Software();
                       s.setCode("txtp");
                       s.setDescription("TextPad");
                       s.setPrice(27.00);
                       s.setVersion(4.7.3);
                   p = s;  // set Product variable equal to the Software object  
           }  
           return p; 
     }
   
}