Abstract Data Types -- a class is a particular representation of some ADT
predefined classes correspond to data structures in procedural languages
Integer
Character
Array
String
Set
LinkedList
Stream
Dictionary
classes for graphics
Point
Line
Rectangle
BitMap
Pen
classes for the user interface and file handling
Directory
DiskBrowser
CursorManager
Prompter
classes for controlling the system
Dispatcher
Debugger
Compiler
Context
special-purpose classes
DemoClass