URL

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URL

• represents a Uniform Resource Locator
• allows data to be downloaded
• data may be retrieved via getContent(), an
  InputStream or a URLConnection
• the url may be specified as a string
• constructor throws MalformedURLException

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URLConnection

• defines a network connection to an object
  specified by a URL
• use URLConnection when you want more control over
  the downloading of data

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Socket

• for interprocess communication over the network
• a Socket connects to a host and port
• uses stream protocol(default) or datagram
  protocol(unreliable)
• can create InputStream and OutputStream objects
  to read and write to the remote host

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ServerSocket

• used by servers to listen for connection requests
• specify a port to listen on
• accept() listens until a client requests a
  connection
• returns a socket the server can use to
  communicate with the client

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