WildcardType

  • WildcardType represents wildcard type expressions like ?, ? extends Number, or ? super Integer.

  • It provides methods to get the lower and upper bounds of the wildcard type.

  • getLowerBounds() returns an array of Type objects representing the lower bound(s), defaulting to null if not explicitly declared.

  • getUpperBounds() returns an array of Type objects representing the upper bound(s), defaulting to Object if not explicitly declared.
public interface WildcardType implements Type

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

Public Method Summary

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

Public Methods

public abstract 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

public abstract 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