© S. Uchitel, 2004
Avoids need to re-invent the wheel.
A class library is a set of classes that support the development of programs.
The Java standard class library
Set of classes that come with all Java implementations
int is primitive Java type. It does not belong to a library
String is part of the Java standard class library
InputReader not part of the standard class library (developed by Robert Chatley at Imperial).