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Annotations in Tiger, Part 1: Add metadata to Java code
Annotations, a new feature in J2SE 5.0 (Tiger), brings a much-needed metadata facility to the core Java language. In this first of a two-part series, author Brett McLaughlin explains why metadata is so useful, introduces you to annotations in the Java language, and delves into Tiger's built-in annotations. Part 2 covers custom annotations.
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Annotations in Tiger, Part 2: Custom annotations
Part 1 of this series introduced annotations, the new metadata facility in J2SE 5.0, and focused on Tiger's basic built-in annotations. A more powerful related feature is support for writing your own annotations. In this article Brett McLauglin shows how to create custom annotations and then how to annotate your annotations to document and customize your code further.
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Aspect-Oriented Annotations
Annotations are one of the new language features in J2SE 5.0, and allow you to attach metadata onto any Java construct. Meanwhile, Aspect-Oriented Programming (AOP) is a fairly new technology that makes it easier for you to encapsulate behavior that is usually messier, harder, or impossible to do with regular object-oriented (OO) techniques.
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Standardize annotations with Web services
Annotation is the process of associating metadata with data. This article presents a Web services API intended as an industry standard for client-server systems designed to facilitate the structured annotation of heterogeneous data. The author presents the goals of the Annotation Web services API and then discusses how those goals motivate the data model around which the API operates. The author also discusses 29 methods that comprise the API including two examples of possible sequences of API calls to create and retrieve annotations.
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