Custom Annotation(@interface)

@Target

/** Class, interface (including annotation type), or enum declaration */
TYPE,
 
/** Field declaration (includes enum constants) */
FIELD,
 
/** Method declaration */
METHOD,
 
/** Formal parameter declaration */
PARAMETER,
 
/** Constructor declaration */
CONSTRUCTOR,
 
/** Local variable declaration */
LOCAL_VARIABLE,
 
/** Annotation type declaration */
ANNOTATION_TYPE,
 
/** Package declaration */
PACKAGE,
 
/**
 * Type parameter declaration
 *
 * @since 1.8
 */
TYPE_PARAMETER,
 
/**
 * Use of a type
 *
 * @since 1.8
 */
TYPE_USE

이는 package java.lang.annotation 에 있는 ElementType입니다.

@Renotation

/**
 * Annotations are to be discarded by the compiler.
 */
SOURCE,
 
/**
 * Annotations are to be recorded in the class file by the compiler
 * but need not be retained by the VM at run time.  This is the default
 * behavior.
 */
CLASS,
 
/**
 * Annotations are to be recorded in the class file by the compiler and
 * retained by the VM at run time, so they may be read reflectively.
 *
 * @see java.lang.reflect.AnnotatedElement
 */
RUNTIME

3번을 이해하기 위해서는 reflect를 참조

@interface (커스텀어노테이션)

참조

https://jdm.kr/blog/216

출처:https://medium.com/@ggikko/java-%EC%BB%A4%EC%8A%A4%ED%85%80-annotation-436253f395ad