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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/annotation/ElementType.html below:

ElementType (Java SE 21 & JDK 21)

All Implemented Interfaces:

Serializable, Comparable<ElementType>, Constable

The constants of this enumerated class 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 interface 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: class and interface declarations (including annotation declarations) and type parameter declarations.

For example, an annotation whose interface is meta-annotated with @Target(ElementType.TYPE_USE) may be written on the class or interface of a field (or within the class or interface of the field, if it is a nested or parameterized class or interface, or array class), and may also appear as a modifier for, say, a class declaration.

The TYPE_USE constant includes class and interface declarations and type parameter declarations as a convenience for designers of type checkers which give semantics to annotation interfaces. For example, if the annotation interface 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

  Annotation interface declaration (Formerly known as an annotation type.)

  Field declaration (includes enum constants)

  Local variable declaration

  Formal parameter declaration

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

  Type parameter declaration

• Method Summary

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

  Returns an array containing the constants of this enum class, 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 interface), 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 interface declaration (Formerly known as an annotation type.)

  • 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

    Record component

    See Java Language Specification:

    8.10.3 Record Members
    9.7.4 Where Annotations May Appear
    

    Since:

    16

• Method Details
  • values

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

    Returns:

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

  • valueOf

    Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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 class has no constant with the specified name

    NullPointerException - if the argument is null

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