/**@class java.lang.annotation.ElementType @extends java.lang.Enum The constants of this enumerated type provide a simple classification of the syntactic locations where annotations may appear in a Java program. These constants are used in {@link Target java.lang.annotation.Target} meta-annotations to specify where it is legal to write annotations of a given type. <p>The syntactic locations where annotations may appear are split into <em>declaration contexts</em> , where annotations apply to declarations, and <em>type contexts</em> , where annotations apply to types used in declarations and expressions. <p>The constants {@link #ANNOTATION_TYPE} , {@link #CONSTRUCTOR} , {@link #FIELD} , {@link #LOCAL_VARIABLE} , {@link #METHOD} , {@link #PACKAGE} , {@link #PARAMETER} , {@link #TYPE} , and {@link #TYPE_PARAMETER} correspond to the declaration contexts in JLS 9.6.4.1. <p>For example, an annotation whose type is meta-annotated with {@code @Target(ElementType.FIELD)} may only be written as a modifier for a field declaration. <p>The constant {@link #TYPE_USE} corresponds to the 15 type contexts in JLS 4.11, as well as to two declaration contexts: type declarations (including annotation type declarations) and type parameter declarations. <p>For example, an annotation whose type is meta-annotated with {@code @Target(ElementType.TYPE_USE)} may be written on the type of a field (or within the type of the field, if it is a nested, parameterized, or array type), and may also appear as a modifier for, say, a class declaration. <p>The {@code TYPE_USE} constant includes type declarations and type parameter declarations as a convenience for designers of type checkers which give semantics to annotation types. For example, if the annotation type {@code NonNull} is meta-annotated with {@code @Target(ElementType.TYPE_USE)}, then {@code @NonNull} {@code class C {...}} could be treated by a type checker as indicating that all variables of class {@code C} are non-null, while still allowing variables of other classes to be non-null or not non-null based on whether {@code @NonNull} appears at the variable's declaration. @author Joshua Bloch @since 1.5 @jls 9.6.4.1 @Target @jls 4.1 The Kinds of Types and Values */ var ElementType = { /**Class, interface (including annotation type), or enum declaration */ TYPE : "null", /**Field declaration (includes enum constants) */ FIELD : "null", /**Method declaration */ METHOD : "null", /**Formal parameter declaration */ PARAMETER : "null", /**Constructor declaration */ CONSTRUCTOR : "null", /**Local variable declaration */ LOCAL_VARIABLE : "null", /**Annotation type declaration */ ANNOTATION_TYPE : "null", /**Package declaration */ PACKAGE : "null", /** Type parameter declaration @since 1.8 */ TYPE_PARAMETER : "null", /** Use of a type @since 1.8 */ TYPE_USE : "null", /** */ values : function( ) {}, /** */ valueOf : function( ) {}, };