Writing method with dynamic return type without type casting

I have often come across this requirement across multiple projects, where we need to write a method, which can potentially return object of any class, and still you would not like to do a typecasting. Something like this:

MyClass myClass = getDynamicClass(MyClass.class);

Instead of :

MyClass myClass = (MyClass) getDynamicClass(MyClass.class);

Common example of such use case is where you would do some lookup of a dynamic service (as in OSGi) and return the object found. However, with Java 5 and above this is easy. So, if your earlier code was:

protected Object getDynamicClass(Class interfaceClass) {
    Object obj = null;
    // code to create / lookup the dynamic object
    return obj;
}

This code can be converted as follows:

protected <ReturnType> ReturnType getDynamicClass(Class<ReturnType> interfaceClass) {
    Object obj = null;
    // code to create / lookup the dynamic object
    if (interfaceClass.isInstance(obj)) {
        return interfaceClass.cast(obj);
    }
    return null;
}

This is very obvious code, but thought that sharing this would be useful. Enjoy!