18. Factory method example

• The ProductAccessFactory class insulates interface from the implementation.

  
      public class ProductAccessFactory
      {
          public static ProductAccess getProductAccess()
          {
              ProductAccess pa = new ProductAccessImplementation();
              return pa;
          }
      }//class ProductAccessFactory
  
  

• The benefit of separating interface from implementation is that the implementation becomes replaceable: it can be swapped with another implementation by changing a single line of code in the ProductAccessFactory class.