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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  package java.lang.annotation;
  
  /**
   * 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
   */
  public enum ElementType {
      /** 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
  }
  