@Retention

@Retention annotation specifies how the marked annotation is stored.

1. RetentionPolicy.SOURCE – The marked annotation is retained only in the source level and is ignored by the compiler.
2. RetentionPolicy.CLASS – The marked annotation is retained by the compiler at compile time, but is ignored by the Java Virtual Machine (JVM).
3. RetentionPolicy.RUNTIME – The marked annotation is retained by the JVM so it can be used by the runtime environment.

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