In this article, I will consider the case of a status-bar component embedded in a GUI application. I will explore a number of different ways to implement this status reporter, starting with the traditional hard-coded idiom. Along the way, I will introduce
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Attribute-Oriented Programming
What I really want to do is to leave any references to StatusManager out of our code altogether and simply tag the method with our message. I can then use either code-generation or run-time introspection to do the real work. The XDoclet Project refers to this as Attribute-Oriented Programming, and provides a framework which can convert custom Javadoc-like tags into source code.
However, with the inclusion of JSR-175, Java 1.5 has provided a more structured format for including these attributes inside of real code. The attributes are called "annotations" and they can be used to provide metadata for class, method, field, or variable definitions. They must be declared explicitly, and provide a sequence of name-value pairs that can contain any constant value (including primitives, strings, enumerations, and classes).
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