Java/com/study/demo8/UDPSender.java

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();
        }
    }
}