DevShed has the second part of their look at the Interpreter design pattern series posted today. This time, they focus on the manipulation of string literals with Interpreter objects in a simple application.

Bearing in mind that in the first article of the series I illustrated how to use an interpreter class to handle a group of fictional users, in this tutorial I'm going to go teach you how to utilize this pattern for manipulating a set of string processing classes.

They start with a method (well, class really) of handling the strings themselves - a StringSaver class - that can write the information out to a file. On top of this, they create the Interpreter class, defining the different bits of functionality that can be performed on the string (uppercase, lowercase, etc). Finally, they combine the two in a simple example that applies the different interpretations to the given string.