Examples to:

• Use URL class to parse URLs and download the network resources specified by a URL
• Use URLConnection class to gain more cntrl over the downloading of network resources
• Write client programs that use the Socket class to communicate over the network
• Use the Socket and SerberSocket classes to write servers
• Send and receive low-overhead datagram packets

Use java.nio package to write efficient server programs, (instead of stream based java.io methods, it uses channel based methods)