update:demo8

com/study/demo8/UDPSender.java

@@ -0,0 +1,26 @@
+package com.study.demo8;
+
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+
+public class UDPSender {
+    public static void main(String[] args) {
+        try {
+            DatagramSocket socket = new DatagramSocket();
+
+            String message = "Hello UDP";
+            byte[] data = message.getBytes();
+
+            InetAddress address = InetAddress.getByName("localhost");
+            DatagramPacket packet = new DatagramPacket(data, data.length, address, 9999);
+
+            socket.send(packet);
+            System.out.println("Sent message to receiver.");
+
+            socket.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}