packet-switched networks packets PageSaver class ParserCallback class parseServerAuthority( ) method (URI class) parseURL( ) method (URLStreamHandler class) Part interface 2nd attributes content headers passing a reference by value remote references password authentication (JavaMail API) password-protected sites, accessing PasswordAuthentication class path payloads plug-ins poke( ) method (UDPPoke class) polling vs callbacks pools POP protocol ports anonymous ports port assignments port scanners 2nd 3rd position( ) method (Buffer classes) POST (URL) CGI and POST method post( ) method (URLConnection class) predefinede attributes of the Attribute class print( ) and printin( ) methods (PrintStream class) PrintStream class problems with PrintWriter class private key processes, reuse of processMultipart( ) method (Multipart class) proposed standards (IETF RFCs) protected fields and methods (URLConnection class) protocol handlers 2nd chargen protocol handler classes used for code examples chargen Handler class ChargeURLConnection class DaytimeURLConnection class DaytimeURLStreamHandler class finger handler class FingerURLConnection class FinitInputStream SourceViewer program that sets a URLStreamHandlerFactory URLStreamHandlerFactory for finger, daytime, and chargen content handlers and daytime protocol handler development by Sun sequence of events in handling protocols URLStreamHandler class connecting method protecting hash code proxy server specification URL parsing methods URLStreamHandlerFactory interface writing finger protocol handler five baseic steps writing classes for new protocols protocols 2nd investigating with Telnet IP (Internet Protocol) IPv4 vs. IPv6 reliable and unreliable TCP (transmission control protocol) time protocol (RFC 868) UDP ( user datagram protocol) proxies Proxy class proxy types ProxySelector class setting system properties proxy servers 2nd public key encryption PushbackInputStream class methods unsupported methods PushbackReader class put( ) methods ByteBuffer class CookieHandler class 2nd ResponseCache class