udp_client

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

public class client {
    public static void main(String[] args) {
        int MAX = 1;
        DatagramSocket s;
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        InetAddress srv_addr;
        DatagramPacket tosend;
        DatagramPacket pkt;
        byte[] buffer;
        char serverMove;
        char move;
        int res = 0;
        int exit = 0;

        try {
            s = new DatagramSocket();
            srv_addr = InetAddress.getByName("localhost");
            tosend = new DatagramPacket("p".getBytes(),1,srv_addr,12345);
            s.send(tosend);

            buffer = new byte[MAX];
            pkt = new DatagramPacket(buffer,1);
            s.receive(pkt);
            serverMove = (new String(pkt.getData())).charAt(0);

            System.out.println(" > " + serverMove);
            if(serverMove == 'k') {
                System.out.println("Let's play.");

                while(exit == 0) {
                    move = (in.readLine()).charAt(0);
                    switch(move) {
                        case '.':
                            if(res>=0) {
                                tosend = new DatagramPacket("y".getBytes(),1,srv_addr,12345);
                                System.out.println("You lose! :(");
                            }
                            else {
                                tosend = new DatagramPacket("i".getBytes(),1,srv_addr,12345);
                                System.out.println("You win! :)");
                            }
                            s.send(tosend);
                            s.receive(pkt);
                            serverMove = (new String(pkt.getData())).charAt(0);
                            System.out.println(" > " + serverMove);
                            exit = 1;
                            break;

                        case 'f':
                            tosend = new DatagramPacket((move + "").getBytes(),1,srv_addr,12345);
                            s.send(tosend);

                            s.receive(pkt);
                            serverMove = (new String(pkt.getData())).charAt(0);
                            System.out.println(" > " + serverMove);
                            if(serverMove == 's')
                                res++;
                            else if(serverMove == 'c')
                                res--;
                            break;

                        case 's':
                            tosend = new DatagramPacket((move + "").getBytes(),1,srv_addr,12345);
                            s.send(tosend);

                            s.receive(pkt);
                            serverMove = (new String(pkt.getData())).charAt(0);
                            System.out.println(" > " + serverMove);
                            if(serverMove == 'f')
                                res--;
                            else if(serverMove == 'c')
                                res++;
                            break;

                        case 'c':
                            tosend = new DatagramPacket((move + "").getBytes(),1,srv_addr,12345);
                            s.send(tosend);

                            s.receive(pkt);
                            serverMove = (new String(pkt.getData())).charAt(0);
                            System.out.println(" > " + serverMove);
                            if(serverMove == 'f')
                                res++;
                            else if(serverMove == 's')
                                res--;
                            break;
                    }
                }
            }
            s.close();
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }
}