| Interface | Description | 
|---|---|
| ContentHandlerFactory | This interface defines a factory for content handlers. | 
| SocketOptions | Interface of methods to get/set socket options. | 
| URLStreamHandlerFactory | This interface defines a factory for  URLstream protocol handlers. | 
| Class | Description | 
|---|---|
| ContentHandler | The abstract class  ContentHandleris the superclass of all classes that read anObjectfrom aURLConnection. | 
| DatagramPacket | This class represents a datagram packet. | 
| DatagramSocket | This class represents a socket for sending and receiving datagram packets. | 
| HttpURLConnection | A URLConnection with support for HTTP-specific features. | 
| Inet4Address | This class represents an Internet Protocol version 4 (IPv4) address. | 
| Inet6Address | This class represents an Internet Protocol version 6 (IPv6) address. | 
| InetAddress | This class represents an Internet Protocol (IP) address. | 
| InetSocketAddress | This class implements an IP Socket Address (IP address + port number) It can also be a pair (hostname + port number),
 in which case an attempt will be made to resolve the hostname. | 
| InterfaceAddress | This class represents a Network Interface address. | 
| MulticastSocket | The multicast datagram socket class is useful for sending and receiving IP multicast packets. | 
| NetPermission | This class is for various network permissions. | 
| NetworkInterface | This class represents a Network Interface made up of a name, and a list of IP addresses assigned to this interface. | 
| ServerSocket | This class implements server sockets. | 
| Socket | This class implements client sockets (also called just "sockets"). | 
| SocketAddress | This class represents a Socket Address with no protocol attachment. | 
| SocketPermission | This class represents access to a network via sockets. | 
| URI | Represents a Uniform Resource Identifier (URI) reference. | 
| URL | Class  URLrepresents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web. | 
| URLConnection | The abstract class  URLConnectionis the superclass of all classes that represent a communications link
 between the application and a URL. | 
| URLDecoder | Utility class for HTML form decoding. | 
| URLEncoder | Utility class for HTML form encoding. | 
| URLStreamHandler | The abstract class  URLStreamHandleris the common superclass for all stream protocol handlers. | 
| Exception | Description | 
|---|---|
| BindException | Signals that an error occurred while attempting to bind a socket to a local address and port. | 
| ConnectException | Signals that an error occurred while attempting to connect a socket to a remote address and port. | 
| HttpRetryException | Thrown to indicate that a HTTP request needs to be retried but cannot be retried automatically, due to streaming mode
 being enabled. | 
| MalformedURLException | Thrown to indicate that a malformed URL has occurred. | 
| NoRouteToHostException | Signals that an error occurred while attempting to connect a socket to a remote address and port. | 
| PortUnreachableException | Signals that an ICMP Port Unreachable message has been received on a connected datagram. | 
| ProtocolException | Thrown to indicate that there is an error in the underlying protocol, such as a TCP error. | 
| SocketException | Thrown to indicate that there is an error creating or accessing a Socket. | 
| SocketTimeoutException | Signals that a timeout has occurred on a socket read or accept. | 
| UnknownHostException | Thrown to indicate that the IP address of a host could not be determined. | 
| UnknownServiceException | Thrown to indicate that an unknown service exception has occurred. | 
| URISyntaxException | Checked exception thrown to indicate that a string could not be parsed as a
 URI reference. |