update:demo8

com/study/demo8/UDPReceiver.java

@@ -0,0 +1,25 @@
+package com.study.demo8;
+
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+
+public class UDPReceiver {
+    public static void main(String[] args) {
+        try {
+            DatagramSocket socket = new DatagramSocket(9999);
+            System.out.println("Receiver started, waiting for data...");
+
+            byte[] buffer = new byte[1024];
+            DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
+
+            socket.receive(packet);
+
+            String message = new String(packet.getData(), 0, packet.getLength());
+            System.out.println("Received from sender: " + message);
+
+            socket.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}