Untitled

public final class EntitiesInterpolate extends Command<StateEntities> {
        private final float alpha;
        public EntitiesInterpolate(final float alpha) {
                super(StateEntities.class);
                this.alpha = alpha;
        }
        @Override
        public void execute(StateEntities listener) {
                listener.interpolate(alpha);
        }
}

//Nope
currentState.execute(new EntitiesInterpolate(accumulatedTime / SECONDS_PER_FRAME));