CS 227 lecture -*- Outline -*-

* intro to object-oriented programming

	Important technique for organizing programs and for doing ADTs.

** ADTs
	Problem with ADT implementations so far:
		no way to keep clients from getting low level access.
			important if want to change rep
				can do it without looking at any client code
		was just a convention, no way to enforce

** organization
	want to be able to easily customize and change programs
		need ADTs for this,
		but don't want to write them from scratch all the time.

	so another way not to write the same thing twice: delegation
		(similar to inheritance)