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. Annotations, a form of metadata, provide 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. Java annotations are a mechanism for adding metadata information to our source code. They’re a powerful part of Java that was added in JDK5. Annotations offer an alternative to the use of XML descriptors and marker interfaces. Although we can attach them to packages, classes, interfaces, methods, and fields, annotations by themselves have no effect...
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