How can I get an element type class from an array type class?

Question

Can I get Class<T> from Class<T[]>?

public static <T> void doSometing(final Class<T[]> arrayType) {

    final Class<T> elementType; // = @@?
}

Or, can I get Class<T[]> from Class<T>?

Answer 1

You can use Class.getComponentType(), although there's no way for that method to give you generic type safety, so you'll need to do an unchecked cast to get a Class<T>:

public static <T> void doSomething(final Class<T[]> arrayType) {

    @SuppressWarnings("unchecked")
    final Class<T> componentType = (Class<T>)arrayType.getComponentType();

    //etc.
}

For the reverse, see this question: Obtaining the array Class of a component type