Web Reference: Sep 27, 2025 · Annotations in Java are a form of metadata that provide additional information about the program. They do not change the action of a compiled program but can be used by the compiler or runtime for processing. Learn Java annotations including built-in annotations, custom annotations, meta-annotations, annotation processing, and framework integration with practical examples. In Java, annotations provide metadata about a program, which can be used by the compiler or at runtime to perform specific actions or validations. Annotations start with the @ symbol followed by the annotation name.
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