why is the enhanced for loop more efficient than the normal for loop

Question

I read that the enhanced for loop is more efficient than the normal for loop here:

http://developer.android.com/guide/practices/performance.html#fo

Answer 1

The for-each uses the Iterator interface. I doubt that it is more efficient than the "old" style. The Iterator also needs to check the size of the list.

It's mostly for readability.

It should be faster for non-random-access collections like LinkedList, but then the comparison is unfair. You would not have used to second implementation (with slow indexed access) anyway.