And a lot, a lot, of my CS prof colleagues believe it is deeply important, for reasons most of them are unable to articulate, that in an intro CS1 class all instance variables be private and accessed only through getters and setters. This is actually baked into the College Board's course description for AP CS A, and a point or two (out of 80) often hinges on it in every exam, so it is near-universally taught in high-school level CS classes (in the US). Sigh.