public class FunctionImpl<String> implements Function<Integer, String> {

    @Override
    public String apply(Integer input) {
        if (input == 1) {
            return (String) "blablabla";
        }
        if (input % 2 == 0) {
            return (String) "sude";
        } else {
            return (String) "liche";
        }

    }
}