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Showing content from https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/annotation/ElementType.html below:

ElementType (Java SE 15 & JDK 15)

All Implemented Interfaces:

Serializable, Comparable<ElementType>, Constable

public enum ElementType
extends Enum<ElementType>

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

meta-annotations to specify where it is legal to write annotations of a given type.

The syntactic locations where annotations may appear are split into declaration contexts, where annotations apply to declarations, and type contexts, where annotations apply to types used in declarations and expressions.

The constants ANNOTATION_TYPE, CONSTRUCTOR, FIELD, LOCAL_VARIABLE, METHOD, PACKAGE, MODULE, PARAMETER, TYPE, and TYPE_PARAMETER correspond to the declaration contexts in JLS 9.6.4.1.

For example, an annotation whose type is meta-annotated with @Target(ElementType.FIELD) may only be written as a modifier for a field declaration.

The constant TYPE_USE corresponds to the type contexts in JLS 4.11, as well as to two declaration contexts: type declarations (including annotation type declarations) and type parameter declarations.

For example, an annotation whose type is meta-annotated with @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.

The 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 NonNull is meta-annotated with @Target(ElementType.TYPE_USE), then @NonNull class C {...} could be treated by a type checker as indicating that all variables of class C are non-null, while still allowing variables of other classes to be non-null or not non-null based on whether @NonNull appears at the variable's declaration.

See Java Language Specification:

9.6.4.1 @Target
4.1 The Kinds of Types and Values

Since:

1.5

• Nested Class Summary
• Enum Constant Summary Enum Constants Enum Constant Description ANNOTATION_TYPE

  Annotation type declaration

  CONSTRUCTOR

  Constructor declaration

  FIELD

  Field declaration (includes enum constants)

  LOCAL_VARIABLE

  Local variable declaration

  METHOD

  Method declaration

  MODULE

  Module declaration.

  PACKAGE

  Package declaration

  PARAMETER

  Formal parameter declaration

  RECORD_COMPONENT

  Associated with records, a preview feature of the Java language.

  Record component

  TYPE

  Class, interface (including annotation type), enum, or record declaration

  TYPE_PARAMETER

  Type parameter declaration

  TYPE_USE

  Use of a type

• Method Summary Modifier and Type Method Description static ElementType valueOf​(String name)

  Returns the enum constant of this type with the specified name.

  static ElementType[] values()

  Returns an array containing the constants of this enum type, in the order they are declared.

  Methods declared in class java.lang.Enumclone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

• Enum Constant Details
  • TYPE

    Class, interface (including annotation type), enum, or record declaration

  • FIELD

    Field declaration (includes enum constants)

  • METHOD

    Method declaration

  • PARAMETER

    Formal parameter declaration

  • CONSTRUCTOR

    Constructor declaration

  • LOCAL_VARIABLE

    Local variable declaration

  • ANNOTATION_TYPE

    Annotation type declaration

  • PACKAGE

    Package declaration

  • TYPE_PARAMETER

    Type parameter declaration

    Since:

    1.8

  • TYPE_USE

    Use of a type

    Since:

    1.8

  • MODULE

    Module declaration.

    Since:

    9

  • RECORD_COMPONENT

    This constant is associated with records, a preview feature of the Java language. Programs can only use this constant when preview features are enabled. Preview features may be removed in a future release, or upgraded to permanent features of the Java language.

    Record component

    See Java Language Specification:

    8.10.3 Record Members
    9.7.4 Where Annotations May Appear
    

    Since:

    14

• Method Details
  • values

    Returns an array containing the constants of this enum type, in the order they are declared.

    Returns:

    an array containing the constants of this enum type, in the order they are declared

  • valueOf

    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

    Parameters:

    name - the name of the enum constant to be returned.

    Returns:

    the enum constant with the specified name

    Throws:

    IllegalArgumentException - if this enum type has no constant with the specified name

    NullPointerException - if the argument is null

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