import java.io.*;
import java.net.*;

public class DatagramExample {

  public static void main(String[] args) {
  
    String s = "This is a test.";
  
    try {
      byte[] data = s.getBytes("UTF-8");
      InetAddress ia = InetAddress.getByName("www.ibiblio.org");
      int port = 7;
      DatagramPacket dp 
          = new DatagramPacket(data, data.length, ia, port);
      System.out.println("This packet is addressed to " 
          + dp.getAddress() + " on port " + dp.getPort());
      System.out.println("There are " + dp.getLength() 
          + " bytes of data in the packet");
      System.out.println(
          new String(dp.getData(), dp.getOffset(), dp.getLength(), "UTF-8"));
    } catch (UnknownHostException | UnsupportedEncodingException ex) {
      System.err.println(ex);
    }
  }
}