third party library

[viaks naik]

Are third party library available along with source code noramlly,if not can we extend them from class files directly?

[Jesper de Jong]

There are lots of open source third party libraries for Java. Have a look at the Apache Jakarta Commons libraries for example. There is also a lot of open source Java software available on SourceForge and on Java-Source.net.

To be able to extend a class, you don't need its source code.