Edit Question - KnowledgeHub

Title Body

What is the easiest way to test (using reflection), whether given method (i.e. java.lang.Method instance) has a return type, which can be safely casted to List<String>? Consider this snippet: public static class StringList extends ArrayList<String> {} public List<String> method1(); public ArrayList<String> method2(); public StringList method3(); All methods 1, 2, 3 fulfill the requirement. It's quite easy to test it for the method1 (via getGenericReturnType(), which returns instance of ParameterizedType), but for methods2 and 3, it's not so obvious. I imagine, that by traversing all getGenericSuperclass() and getGenericInterfaces(), we can get quite close, but I don't see, how to match the TypeVariable in List<E> (which occurs somewhere in the superclass interfaces) with the actual type parameter (i.e. where this E is matched to String). Or maybe is there a completely different (easier) way, which I overlook? EDIT: For those looking into it, here is method4, which also fulfills the requirement and which shows some more cases, which have to be investigated: public interface Parametrized<T extends StringList> { T method4(); }

Tags (comma-separated) Cancel