Module java.base
Package java.lang.reflect

Interface ParameterizedType

  • All Superinterfaces:
    Type

    public interface ParameterizedType
extends Type
    ParameterizedType represents a parameterized type such as Collection<String>.

    A parameterized type is created the first time it is needed by a reflective method, as specified in this package. When a parameterized type p is created, the generic type declaration that p instantiates is resolved, and all type arguments of p are created recursively. See TypeVariable for details on the creation process for type variables. Repeated creation of a parameterized type has no effect.

    Instances of classes that implement this interface must implement an equals() method that equates any two instances that share the same generic type declaration and have equal type parameters.

    Since:
    1.5

    • Method Detail

      • getActualTypeArguments

        Type[] getActualTypeArguments​()
        Returns an array of Type objects representing the actual type arguments to this type.

        Note that in some cases, the returned array be empty. This can occur if this type represents a non-parameterized type nested within a parameterized type.

        Returns:
        an array of Type objects representing the actual type arguments to this type
        Throws:
        TypeNotPresentException - if any of the actual type arguments refers to a non-existent type declaration
        MalformedParameterizedTypeException - if any of the actual type parameters refer to a parameterized type that cannot be instantiated for any reason
        Since:
        1.5

      • getRawType

        Type getRawType​()
        Returns the Type object representing the class or interface that declared this type.
        Returns:
        the Type object representing the class or interface that declared this type
        Since:
        1.5

      • getOwnerType

        Type getOwnerType​()
        Returns a Type object representing the type that this type is a member of. For example, if this type is O<T>.I<S>, return a representation of O<T>.

        If this type is a top-level type, null is returned.

        Returns:
        a Type object representing the type that this type is a member of. If this type is a top-level type, null is returned
        Throws:
        TypeNotPresentException - if the owner type refers to a non-existent type declaration
        MalformedParameterizedTypeException - if the owner type refers to a parameterized type that cannot be instantiated for any reason
        Since:
        1.5