act method, Actor interface
5 ball version of the pong game
object array and casting?
luis: bouncing ball thing, projectile thing, convenience method, today – searching, lastIndexOf, indexOf, break, convenience method
0.5 of the class 30 minutes for find nth occurrence, other people longer
find all indices, return them as an array that is exactly as long as the number of indices. two approaches. space vs time.
next – sorting and searching of grade records
fanny – arrays pa rin.
cs21a – basics, arrays, vectors
cs21b – style