You could import the SmoothMover class and let your class extend it. Then you can move in doubles instead of only ints. I never used floats, so I don't know if there is any difference between the use of them and of doubles.

The only difference is in the precision. Doubles are more precise, as they use 8 bytes for storing them while floats only use 4. To explain the issue more in detail. You could cast the aruments of the 'setLocation' method to '(int)'; however, you lose precision when you use 'getX()' and 'getY()' to retrieve its current location. Hence, maintaining the current coordinates of the location of the actor as a double or float, as opposed to using an int, in fields will allow the precision to be maintained. This is precisely what a class like the SmoothMover class does, as well as providing methods to work with those fields.