java udp socket

i use java udp socket write a program today.

classes used:

DatagramScocket(int port);

DatagramPacket(byte[] buf, int length, InetAddress address,int port); //for send

DatagramPacket(byte[] buf, int length); //for receive

implements:

first, construct a DatagramSocket object with a specified port.

then construct a DatagramPacket with a buffer, length, InetAddress and port to send you message,

the message is stroed in the buffer which is a byte array.

also you can construct a DatagramPacket with a buffer and length to recieve message from the port blinded with you socket.

note:

if you send message to a server that not recieve you message , the message is lost. this future is differnet to tcp connetion.

so to make udp program , you must deal with package lost!!!