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 how to use annotations, a form of metadata, to provide data about a program that is not part of the code. Find out how to apply annotations, what predefined annotation types are available, and how to write code with stronger type checking. 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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