Java Define Your Own Annotation

The annotation processing api is located in the javax annotation processing package.

Java define your own annotation. This interface tells java this is a custom annotation. In this tutorial we will show you how to create two custom annotations test and testinfo to simulate a simple unit test framework. The build process includes generating source code compiling the source generating xml files e g.

Now we can use our own myservice annotations to annotate our services. We also added both spring annotations to our annotation. We can define annotations to be available at runtime which we can access using java reflection and can be used to give instructions to the program at runtime.

Java annotations can be be used at build time when you build your software project. Java annotations are a mechanism for adding metadata information to our source code. An annotation always starts with the symbol followed by the annotation name.

An annotation is defined with the interface keyword instead of class or interface. Building the software is typically done by an automatic build tool like apache ant or apache maven. Annotation type is used for defining an annotation.

Deployment descriptors packaging the compiled code and files into a jar file etc. P s this unit test example is inspired by this official java annotation article. An annotation type definition takes an at sign followed by the interface keyword plus the annotation name.

The standard java annotation retention is used to indicate that the annotation should be processable at runtime. Attached with class interface methods or fields to indicate some additional information which can be used by java compiler and jvm. The main interface that you ll have to implement is the processor interface which has a partial implementation in the form of abstractprocessor class.