CODEWITHSUNDEEP
javagenericsreflection
pail
pail

Reputation: 45

Check if a class is generic type

Maybe this is not a big problem, but i could not figure it out. Is there a way to check if a class is defined as a generic type. I don't want to define an instance of this class, i just want somehow to know, if this class is defined as a normal class or as generic type class.

This would be the first Class, which is of type Generic

public class MyGenericClass<T, G> {

    public void someMethod(T firstParam, G secondParam){
        // do something
    }
}

and this would be the second and normal Class

public class AnotherClass {

   public void someMethod(){
       // do something
   }
}

I want a way to find out this result

isGenericType(MyGenericClass.class) --> true
isGenericType(AnotherClass.class) --> false

Upvotes: 3

Views: 1055

Answers (1)

khelwood
khelwood

Reputation: 59114

From the Class<?> object you can check cls.getTypeParameters().

From a generic class you get a nonempty array of TypeVariable.

From a non-generic class you get an empty array.

E.g.

java.util.List.class.getTypeParameters()
TypeVariable[1] { E }

String.class.getTypeParameters()
TypeVariable[0] {}

Upvotes: 3

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