Java Language Tutorial => Annotations

Introduction

In Java, an annotation is a form of syntactic metadata that can be added to Java source code. It provides data about a program that is not part of the program itself. Annotations have no direct effect on the operation of the code they annotate. Classes, methods, variables, parameters and packages are allowed to be annotated.

Syntax

@AnnotationName // 'Marker annotation' (no parameters)
@AnnotationName(someValue) // sets parameter with the name 'value'
@AnnotationName(param1 = value1) // named parameter
@AnnotationName(param1 = value1, param2 = value2) // multiple named parameters
@AnnotationName(param1 = {1, 2, 3}) // named array parameter
@AnnotationName({value1}) // array with single element as parameter with the name 'value'

Remarks

Parameter types

Only constant expressions of following types are allowed for parameters, as well as arrays of these types:

String
Class
primitive types
Enum types
Annotation Types

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Introduction

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Remarks

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Java Language

Java Language Annotations

Fastest Entity Framework Extensions

Introduction

Syntax

Remarks

Parameter types

Annotations Related Examples

Got any Java Language Question?