Networking Enhancements

The JDK 1.1 release made several enhancements to the networking package, java.net: Support was added for selected BSD-style socket options; Socket and ServerSocket are now non-final, extendable classes; new subclasses of SocketException have been added for finer granularity in reporting and handling network errors; and support was added for multicasting.
The JDK 1.1 release also includes general performance improvements and bug fixes.
Where to Find Documentation

To find a list of the new classes and interfaces added to java.net to support these enhancements, refer to Classes New for 1.1 and to find a list of the APIs deprecated in java.net see Alternatives to Deprecated Methods in java.lang, java.net, and java.util .

The Networking Enhancements page provides some descriptive material about the changes to java.net.

What's New in 1.1?