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 en
Tutorial Details:
Annotation Overview
First let's give a brief overview of the two technologies. Annotations are new to JDK 5.0 and are defined in detail in the JSR-175 specification. They allow you to define metadata in a typesafe way and apply it to a class, method, constructor, field, or parameter. For those of you familiar with XDoclet, annotations will be very intuitive to you in that you are used to declaring tags to generate code. The main difference between the two is that annotations are a typed part of the Java language, while XDoclet tags can be mistyped and are harder to create. I like to work with examples, so let's show a simple one.
To define an annotation, all you need to do is declare a special kind of Java interface.
Orange.java
package org.jboss.colors;
public @interface Orange {}
After defining this interface, you can use it to give more description to your Java elements.
Foo.java
package org.jboss.examples;
public class Foo
{
@Orange void someMethod();
@Orange private int someField;
}
So what can use use annotations for? Some people envision using annotations for code generation and a replacement for XDoclet. Others, like the J2EE and EJB 3.0 expert groups, see it as a replacement for deployment descriptors. This article talks about how annotations can be used with AOP.
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