Interface WildcardType

All Superinterfaces:
Type
public interface WildcardType
extends Type

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

Since:
1.5

Methods

Modifier and Type Method Description
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.

Methods declared in interface java.lang.reflect.Type

getTypeName

Methods

getUpperBounds

Type[] getUpperBounds()

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:
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. 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

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https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/reflect/WildcardType.html