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Java annotation
An annotation, in the Java computer programming language, is a form of syntactic metadata that can be added to Java source code.〔(【引用サイトリンク】Annotations ).〕 Classes, methods, variables, parameters and packages may be annotated. Unlike Javadoc tags, Java annotations can be reflective in that they can be embedded in class files generated by the compiler and may be retained by the Java VM to be made retrievable at run-time.〔.〕 It is possible to create meta-annotations out of the existing ones in Java.
== History ==
The Java platform has various ''ad-hoc'' annotation mechanisms—for example, the ''transient'' modifier, or the ''@deprecated'' javadoc tag. JSR-175 introduced the general-purpose annotation (also known as ''metadata'') facility to the Java Community Process in 2002; it gained approval in September 2004.〔
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Annotations became available in the language itself beginning with version 1.5 of the JDK. The apt tool provided a provisional interface for compile-time annotation processing in JDK version 1.5; JSR-269 formalized this, and it became integrated into the javac compiler in version 1.6.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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