008.Java class libraries.

Java programs consits of pieces called classes. classes consits of pieces called methods that perform tasks and return information when they complete their tasks. you can program each piece you may need to form a java program. but most java programmers take advantages of rich collections of existing classes in java class libraries. The class libraries are also known as the java APis[ applications programming interfaces]. Thus there are really two pices to learning the java"world". The first is learning the java language itself so that you can program your own classes and the second is learning how to use the classes in the libraries are provided primarily by compilier vendors. Also , many class libraries are available from the internet and world wide web as shareware[products you can download for a small fee] and freeware[products you can download for free