What is annotation in Java with example?
Java Annotations. Java Annotation is a tag that represents the metadata i.e. attached with class, interface, methods or fields to indicate some additional information which can be used by java compiler and JVM. Annotations in Java are used to provide additional information, so it is an alternative option for XML and Java marker interfaces.
What is @target annotation in Java?
Type Annotations in Java The type annotations are applicable to any place where there is a use of a type. For example, if we want to annotate the return type of a method, we can declare these annotations with @Target annotation. Code to demonstrate a Type Annotation
How to declare an annotation using @interface element?
The @interface element is used to declare an annotation. For example: Here, MyAnnotation is the custom annotation name. There are few points that should be remembered by the programmer. Method should return one of the following: primitive data types, String, Class, enum or array of these data types.
Why are @annotations not present in Javadoc comments?
Annotations are not present in Javadoc comments. The @Documented annotation enables tools like Javadoc to process it and include the annotation type information in the generated document. The design of Target annotation is such that we can use them only as an annotation to another annotation.
What is the difference between @inherited and @documented annotations in Java?
On behalf of the annotation, java compiler or JVM performs some additional operations. By default, annotations are not inherited to subclasses. The @Inherited annotation marks the annotation to be inherited to subclasses. The @Documented Marks the annotation for inclusion in the documentation.
What is the effect of an annotation on the code?
Annotations have no direct effect on the operation of the code they annotate. Annotations have a number of uses, among them: Information for the compiler — Annotations can be used by the compiler to detect errors or suppress warnings. Compile-time and deployment-time processing — Software tools can process annotation information…
What is the use of annotations in compiler?
1 Information for the compiler — Annotations can be used by the compiler to detect errors or suppress warnings. 2 Compile-time and deployment-time processing — Software tools can process annotation information to generate code, XML files, and so forth. 3 Runtime processing — Some annotations are available to be examined at runtime.