Interface TypeVariable

All Superinterfaces:: AnnotatedConstruct, ReferenceType, TypeMirror

public interface TypeVariable extends ReferenceType

Represents a type variable. A type variable may be explicitly declared by a type parameter of a type, method, or constructor. A type variable may also be declared implicitly, as by the capture conversion of a wildcard type argument (see chapter 5 of The Java Language Specification).

See Java Language Specification:

4.4 Type Variables

Since:

1.6

See Also:

Method Summary

Modifier and Type	Method	Description
`Element`	`asElement()`	Returns the element corresponding to this type variable.
`TypeMirror`	`getLowerBound()`	Returns the lower bound of this type variable.
`TypeMirror`	`getUpperBound()`	Returns the upper bound of this type variable.

Methods declared in interface TypeMirror

accept, equals, getAnnotation, getAnnotationMirrors, getAnnotationsByType, getKind, hashCode, toString

Modifier and Type	Method	Description
`<R,P> R`	`accept(TypeVisitor<R,P> v, P p)`	Applies a visitor to this type.
`boolean`	`equals(Object obj)`	Obeys the general contract of `Object.equals`.
`<A extends Annotation> A`	`getAnnotation(Class<A> annotationType)`	Returns this construct's annotation of the specified type if such an annotation is present, else `null`.
`List<? extends AnnotationMirror>`	`getAnnotationMirrors()`	Returns the annotations that are directly present on this construct.
`<A extends Annotation> A[]`	`getAnnotationsByType(Class<A> annotationType)`	Returns annotations of the specified type that are associated with this construct.
`TypeKind`	`getKind()`	Returns the `kind` of this type.
`int`	`hashCode()`	Obeys the general contract of `Object.hashCode`.
`String`	`toString()`	Returns an informative string representation of this type.

Method Details

asElement

Element asElement()

Returns the element corresponding to this type variable.

Returns:: the element corresponding to this type variable

getUpperBound

TypeMirror getUpperBound()

Returns the upper bound of this type variable.

If this type variable was declared with no explicit upper bounds, the result is java.lang.Object. If it was declared with multiple upper bounds, the result is an intersection type; individual bounds can be found by examining the result's bounds.

Returns:: the upper bound of this type variable
See Java Language Specification:: 4.9 Intersection Types

getLowerBound

TypeMirror getLowerBound()

Returns the lower bound of this type variable. While a type parameter cannot include an explicit lower bound declaration, capture conversion can produce a type variable with a non-trivial lower bound. Type variables otherwise have a lower bound of NullType.

Returns:: the lower bound of this type variable
See Java Language Specification:: 18.1.3 Bounds

© 1993, 2025, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.