Which is t3h awesome, but not an option in either language under consideration, as far as I know. Unless you used a Haskell-to-JS compiler. I apologize if I implied that static typing = Java's kind of typing.
Interfaces are a different concept. In functional programming, an implementation of an interface would extend the domain of polymorphic functions that use that interface. The same can be said about Java, if you tilt your head funny and don't need to communicate with other Java programmers, and if you only care about single argument dispatch.