Web Reference: Mar 27, 2003 · Learn how to use annotations to add metadata to your Java code. Annotations can be applied to declarations, types, and expressions, and can be predefined or custom. 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. Java Annotations Annotations are special notes you add to your Java code. They start with the @ symbol. They don't change how your program runs, but they give extra information to the compiler or tools.
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