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I think I understand StringIO somewhat as being similar to Java's StringBuffer class, but I don't really understand it fully. How would you define it and its purpose/possible uses in Ruby? Just hoping to clear up my confusion.
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no, StringIO is more similar to StringReader/StringWriter than StringBuffer.
In Java StringBuffer is the mutable version of String (since String is immutable).
StringReader/StringWriter are handy classes meant to be used when you want to fake file access . You can read/write in a String with the same stream-oriented interface of Reader/Writer: it is immensely useful in unit testing.