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Asked: 2026-06-03T05:05:18+00:00

Java exposes generic type information e.g. for field types at runtime through interface java.lang.reflect.Type

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Java exposes generic type information e.g. for field types at runtime through interface java.lang.reflect.Type and its subinterfaces (ParameterizedType, WildcardType).

Does anybody know where I can find a component that can determine if objects of one Type can be casted to another Type, e.g. if a Set<Object> can be casted to Set or a Comparator<User> can be casted to Comparator<? extends Object>?

The solution should work for type information represented by java.lang.reflect.Type, not only Classes, and it should take generics into consideration, i.e. a List<Integer> should not be castable to a List<Object>.

Regards,
Jochen

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1 Answer

  1. Editorial Team

    Guava’s TypeToken is designed for exactly this problem, among others. It’s meant to be a replacement for Class that’s generics-aware. (Disclosure: I contribute to Guava.)

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