java.net
Interfaces  
ContentHandlerFactory
FileNameMap
SocketImplFactory
SocketOptions
URLStreamHandlerFactory
Classes  
Authenticator
ContentHandler
DatagramPacket
DatagramSocket
DatagramSocketImpl
HttpURLConnection
InetAddress
JarURLConnection
MulticastSocket
NetPermission
PasswordAuthentication
ServerSocket
Socket
SocketImpl
SocketPermission
URL
URLClassLoader
URLConnection
URLDecoder
URLEncoder
URLStreamHandler
Exceptions  
BindException
ConnectException
MalformedURLException
NoRouteToHostException
ProtocolException
SocketException
UnknownHostException
UnknownServiceException