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+<code java>
+package chatMulticast;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.InetAddress;
+import java.net.MulticastSocket;
+public class CopyIn extends Thread {
+	int chatPort = 0;
+	InetAddress chatAddress = null;
+	final int MAXBUF = 1024;
+	public  CopyIn(InetAddress ia, int port) {
+		chatPort = port;
+		chatAddress = ia;
+	}
+	public void run() {
+		MulticastSocket ds = null;
+		try {
+			ds = new MulticastSocket(chatPort);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		try {
+			ds.joinGroup(chatAddress);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		DatagramPacket dp = null;
+		while (true) {
+			try {
+				dp = new DatagramPacket(new byte[MAXBUF], 0, MAXBUF);
+				ds.receive(dp);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+			String line =  new String(dp.getData());
+			System.out.println("From "+dp.getAddress().getHostName()+": "+line);
+		}
+	}
+}
+</code>