implement the sellable interface shown in code fragment we can then define concrete classphotographshown in code fragment that implements the sellable interfaceindicating that we would be willing to sell any of our photograph objectsthis class defines an object that implements each of the methods of the sellable interfaceas required in additionit adds methodiscolorwhich is specialized for photograph objects another kind of object in our collection might be something we could transport for such objectswe define the interface shown in code fragment code fragment interface sellable code fragment class photograph implementing the sellable interface