程序包 java.lang.reflect

接口 TypeVariable<D extends GenericDeclaration>

类型参数:

D - the type of generic declaration that declared the underlying type variable.

所有超级接口:

AnnotatedElement, Type

public interface TypeVariable<D extends GenericDeclaration>
extends Type, AnnotatedElement

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 nth enclosing class of T (see JLS 8.1.2), then the creation of t requires the resolution (see JVMS 5) of the ith 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.

从以下版本开始:

1.5

方法概要

限定符和类型	方法	说明
Type[]	getBounds()	Returns an array of Type objects representing the upper bound(s) of this type variable.
D	getGenericDeclaration()	Returns the GenericDeclaration object representing the generic declaration declared this type variable.
String	getName()	Returns the name of this type variable, as it occurs in the source code.

从接口继承的方法 java.lang.reflect.AnnotatedElement

getAnnotation, getAnnotations, getAnnotationsByType, getDeclaredAnnotation, getDeclaredAnnotations, getDeclaredAnnotationsByType, isAnnotationPresent

从接口继承的方法 java.lang.reflect.Type

getTypeName

方法详细资料

getBounds

Type[] getBounds()

Returns an array of Type objects representing the upper bound(s) of this type variable. Note that 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.

返回:

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

抛出:

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

D getGenericDeclaration()

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

返回:

the generic declaration declared for this type variable.

从以下版本开始:

1.5

getName

String getName()

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

返回:

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