example2swnderreceiver.java

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

/**
 * A subclass of DatagramSocket which contains
 * methods for sending and receiving messages
 */
public class MyDatagramSocket extends DatagramSocket {
    static final int MAX_LEN = 10;

    MyDatagramSocket(int portNo) throws SocketException {
        super(portNo);
    }

    public void sendMessage(InetAddress receiverHost, int receiverPort,
                            String message) throws IOException {
        byte[] sendBuffer = message.getBytes();
        DatagramPacket datagram =
            new DatagramPacket(sendBuffer, sendBuffer.length,
                               receiverHost, receiverPort);
        this.send(datagram);
    }
}