DatagramSocket socket = new DatagramSocket(. . .) ;
DatagramPacket packet = new DatagramPacket(. . .) ;
packet.setPort(serverPort) ;
packet.setAddress(serverAddress) ;
//Envoie de données
byte[ ] sentBuffer  = ...;
packet.setData(sentBuffer) ;
socket.send(packet) ;
//Récupératio nde données
byte[ ] receiveBuffer = . . . ;
packet.setData(receiveBuffer) ;
socket.receive(packet) ;
socket.close() ;