WildcardType (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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java.lang.reflect
Interface WildcardType

All Superinterfaces:: Type

public interface WildcardType
extends Type
extends Type

WildcardType represents a wildcard type expression, such as ?, ? extends Number, or ? super Integer.

Since:: 1.5

Method Summary

Type[] getLowerBounds()
Returns an array of Type objects representing the lower bound(s) of this type variable.

Type[] getUpperBounds()
Returns an array of Type objects representing the upper bound(s) of this type variable.

Method Summary
`Type[]`	`getLowerBounds()` Returns an array of `Type` objects representing the lower bound(s) of this type variable.
`Type[]`	`getUpperBounds()` Returns an array of `Type` objects representing the upper bound(s) of this type variable.

Method Detail

getUpperBounds

Type[] getUpperBounds()

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.

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

getLowerBounds

Type[] getLowerBounds()

Returns an array of Type objects representing the lower bound(s) of this type variable. Note that if no lower bound is explicitly declared, the lower bound is the type of null. In this case, a zero length array is returned.

For each lower 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:: an array of Types representing the lower bound(s) of this type variable
Throws:: 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