I receive a warning here that Map is a raw type.
// Map is a raw type. References to generic type Map<K,V> should be parameterized
Class<Map> c = Map.class;
But if I parameterize the type, then I get a mismatch:
// Type mismatch: cannot convert from Class<Map> to Class<Map<Object,Object>>
Class<Map<Object, Object>> c = Map.class;
I have tried a few variations, but I can't find any way to parameterize the right side of the expression (Map.class
) to satisfy the left side, which is parameterized.
How do I parameterize Map.class
in this instance?
In this case I am passing it to a method with a signature:
public <T> T method(Class<T> type) {
return (T) otherMethod(type);
}
I only want to provide the Map
type, as I don't know what kind of map is used internally, and this detail is not important. I am trying to resolve the warning I get when calling the method:
// Type safety: The expression of type Map needs unchecked conversion to conform to Map<String,Object>
Map<String, Object> a = method(Map.class);
This suppresses the warning at the call site:
public static <T> T method(Class<? super T> type) {
return (T) otherMethod(type);
}
There is still an unchecked cast warning on the expression (T) otherMethod(type)
, but I believe that is unavoidable.