OpenJDK 27 · java.lang.reflect.TypeVariable · APIdia, the JavaDoc alternative

TypeVariable is the common superinterface for type variables of kinds. A type variable is created the first time it is needed by a reflective method, as specified in this package. If a type variable t is referenced by a type (i.e, class, interface or annotation type) T, and T is declared by the n^th enclosing class of T (see JLS 8.1.2), then the creation of t requires the resolution (see JVMS 5) of the i^th enclosing class of T, for i = 0 to n, inclusive. Creating a type variable must not cause the creation of its bounds. Repeated creation of a type variable has no effect.

Multiple objects may be instantiated at run-time to represent a given type variable. Even though a type variable is created only once, this does not imply any requirement to cache instances representing the type variable. However, all instances representing a type variable must be equal() to each other. As a consequence, users of type variables must not rely on the identity of instances of classes implementing this interface.

Method Summary

Modifier and Type	Method and Description
public AnnotatedType[]	Returns: an array of objects representing the upper bound(s) of the type variable getAnnotatedBounds() Returns an array of AnnotatedType objects that represent the use of types to denote the upper bounds of the type parameter represented by this TypeVariable.
public Type[]	Returns: an array of `Type`s representing the upper bound(s) of this type variable getBounds() Returns an array of `Type` objects representing the upper bound(s) of this type variable.
public D	Returns: the generic declaration declared for this type variable. getGenericDeclaration() Returns a `GenericDeclaration` object representing the generic declaration declared for this type variable.
public String	Returns: the name of this type variable, as it appears in the source code getName() Returns the name of this type variable, as it occurs in the source code.

Inherited from java.lang.reflect.AnnotatedElement:: getAnnotation getAnnotations getAnnotationsByType getDeclaredAnnotation getDeclaredAnnotations getDeclaredAnnotationsByType isAnnotationPresent
Inherited from java.lang.reflect.Type:: getTypeName

Method Detail

getAnnotatedBounds back to summary

getAnnotatedBounds	back to summary
public AnnotatedType[] getAnnotatedBounds() Returns an array of AnnotatedType objects that represent the use of types to denote the upper bounds of the type parameter represented by this TypeVariable. The order of the objects in the array corresponds to the order of the bounds in the declaration of the type parameter. Note that if no upper bound is explicitly declared, the upper bound is unannotated `Object`. Returns:AnnotatedType[] an array of objects representing the upper bound(s) of the type variable Since 1.8

public AnnotatedType[] getAnnotatedBounds()

Returns an array of AnnotatedType objects that represent the use of types to denote the upper bounds of the type parameter represented by this TypeVariable. The order of the objects in the array corresponds to the order of the bounds in the declaration of the type parameter. Note that if no upper bound is explicitly declared, the upper bound is unannotated Object.

Returns:AnnotatedType[]: an array of objects representing the upper bound(s) of the type variable
Since: 1.8

getBounds back to summary

getBounds	back to summary
public Type[] getBounds() Returns an array of `Type` objects representing the upper bound(s) of this type variable. If no upper bound is explicitly declared, the upper bound is `Object`. For each upper bound B: if B is a parameterized type or a type variable, it is created, (see `ParameterizedType` for the details of the creation process for parameterized types). Otherwise, B is resolved. Returns:Type[] an array of `Type`s representing the upper bound(s) of this type variable Exceptions TypeNotPresentException: if any of the bounds refers to a non-existent type declaration MalformedParameterizedTypeException: if any of the bounds refer to a parameterized type that cannot be instantiated for any reason

public Type[] getBounds()

Returns an array of Type objects representing the upper bound(s) of this type variable. If no upper bound is explicitly declared, the upper bound is Object.

For each upper bound B:

if B is a parameterized type or a type variable, it is created, (see ParameterizedType for the details of the creation process for parameterized types).
Otherwise, B is resolved.

Returns:Type[]

an array of Types representing the upper bound(s) of this type variable

Exceptions

TypeNotPresentException:: if any of the bounds refers to a non-existent type declaration
MalformedParameterizedTypeException:: if any of the bounds refer to a parameterized type that cannot be instantiated for any reason

getGenericDeclaration back to summary

getGenericDeclaration	back to summary
public D getGenericDeclaration() Returns a `GenericDeclaration` object representing the generic declaration declared for this type variable. Returns:D the generic declaration declared for this type variable. Since 1.5

public D getGenericDeclaration()

Returns a GenericDeclaration object representing the generic declaration declared for this type variable.

Returns:D: the generic declaration declared for this type variable.
Since: 1.5

getName	back to summary
public String getName() Returns the name of this type variable, as it occurs in the source code. Returns:String the name of this type variable, as it appears in the source code

getName

back to summary

public String getName()

Returns the name of this type variable, as it occurs in the source code.

Returns:String: the name of this type variable, as it appears in the source code

public Interface TypeVariable<D extends GenericDeclaration>

Method Summary

Method Detail