CODEWITHSUNDEEP
javagenericsreflection
michael nesterenko
michael nesterenko

Reputation: 14439

set generic class type

How can I set generic type? For example:

Class<List<Integer>> asd = List<Integer>.class \\ does not work

May be that is a bit stupid question, but I have never met a code where this thing was done.

Upvotes: 5

Views: 2894

Answers (2)

BRPocock
BRPocock

Reputation: 13914

In short, what you want is List.class; the generic types are only available at compile-time, and are "erased" at run-time. There's a brief explanation here: http://docs.oracle.com/javase/tutorial/java/generics/erasure.html ...and a bit more detail here: http://www.artima.com/weblogs/viewpost.jsp?thread=208860

Upvotes: 3

Steven Schlansker
Steven Schlansker

Reputation: 38526

This is not possible, due to type erasure. There's a number of hacks in various libraries to help out with reflection, but the language itself has generally poor support for introspection of generic types.

Upvotes: 2

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