DatagramSocket.DatagramSocket
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 public DatagramSocket() throws SocketException
Description
 Constructs a datagram socket and binds it to any available port 
 on the local host machine.
  
Exceptions
 SocketException
     if the socket could not be opened,
               or the socket could not bind to the specified local port.
  
 public DatagramSocket( int port ) throws SocketException
Parameters
-  local 
-  port to use.
    
Description
 Constructs a datagram socket and binds it to the specified port 
 on the local host machine.
  
Exceptions
 SocketException
     if the socket could not be opened,
               or the socket could not bind to the specified local port.
  
 public DatagramSocket( int port,
                       InetAddress laddr ) throws SocketException
Parameters
-  port 
-  local port to use
    
-  laddr 
-  local address to bind
  
Description
 Creates a datagram socket, bound to the specified local
 address.  The local port must be between 0 and 65535 inclusive.