Java Language
- Getting started with Java Language
- Top 10 Java Errors with Solutions
- Awesome Book
- Awesome Community
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- 2D Graphics in Java
- Alternative Collections
- Annotations
- The idea behind Annotations
- Add multiple annotation values
- Annotations for 'this' and receiver parameters
- Built-in annotations
- Compile time processing using annotation processor
- Defining annotation types
- Getting Annotation values at run-time
- Inherited Annotations
- Repeating Annotations
- Runtime annotation checks via reflection
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Java Language Annotations The idea behind Annotations
Example
The Java Language Specification describes Annotations as follows:
An annotation is a marker which associates information with a program construct, but has no effect at run time.
Annotations may appear before types or declarations. It is possible for them to appear in a place where they could apply to both a type or a declaration.
What exactly an annotation applies to is governed by the "meta-annotation" @Target. See "Defining annotation types" for more information.
Annotations are used for a multitude of purposes. Frameworks like Spring and Spring-MVC make use of annotations to define where Dependencies should be injected or where requests should be routed.
Other frameworks use annotations for code-generation. Lombok and JPA are prime examples, that use annotations to generate Java (and SQL) code.
This topic aims to provide a comprehensive overview of:
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How to define your own Annotations?
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What Annotations does the Java Language provide?
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How are Annotations used in practice?
