Why does a RecyclerView.LayoutManager's default smoothScrollToPosition method Log.e()?

问题

I'm suprised by Android code sometimes. As the title asks;

Why does a RecyclerView.LayoutManager's default smoothScrollToPosition method write a Log.e message instead of throwing an exception?

(This is in the support v7 library, 24.0.0)

public void smoothScrollToPosition(RecyclerView recyclerView, State state, int position) {
        Log.e(TAG, "You must override smoothScrollToPosition to support smooth scrolling");
    }

I would expect this method to throw an exception since whoever called this method obviously didn't implement the required methods/classes.

来源：https://stackoverflow.com/questions/38391869/why-does-a-recyclerview-layoutmanagers-default-smoothscrolltoposition-method-lo