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Java Annotations

Annotations provide data about a program that is not part of the program itself.
They have no direct effect on the operation of the code they annotate.
Example:
@Author
(
    name = "Benjamin Franklin",
    date = "3/27/2003"
)

class MyClass() {

}

Brackets may be omitted if there are no elements.
Example : @Override

Three annotations are provided by the language itself:
  1. @Deprecated
  2. @Override
  3. @SuppressWarnings ({“unchecked”, “deprecation”})


The type of annotation can be defined as an annotation type. The syntax for doing this is:


// Definition of a new annotation 

@interface ClassPreamble 
{
    String author();
    String date();
    int currentRevision() default 1;
    String lastModified() default "N/A";
    String lastModifiedBy() default "N/A";
    String[] reviewers(); // Note use of array
}


// Using the new annotation

@ClassPreamble 
(
    author = "John Malkovich",
    date = "01/03/2012",
    currentRevision = 20,
    lastModified = "4/12/2014",
    lastModifiedBy = "Jane Handerson",
    reviewers = {"Mike", "Bob", "Peter"} // Note array notation
)

public class SomeClass extends Generation2List { ... }




For multi-threading applications, JCIP provides a few handy annotations.




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Site Owner: Sachin Goyal