[OS] Java Networking Ispit

//https://imgur.com/a/2WX45MO?fbclid=IwAR2de4_7KK_AyW1BoOQADI1MT1gk0oodY9fOJDJnsLKmdQIj9ykL0a7pg1c

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.Semaphore;

public class TCPServer {
    private ServerSocket server;
    private File client_data;

    public TCPServer(File client_data) {
        this.server = new ServerSocket(3398);
        this.client_data = client_data;
    }
    public void takeRequests() throws IOException {
        while(true){
            Socket client=this.server.accept();
            ServerWorkerThread swt=new ServerWorkerThread(client_data,client);
            swt.start();


        }
    }
    static class ServerWorkerThread extends  Thread{
        private File client_data;
        private Socket client;
        private static Semaphore semaphore= new Semaphore(1);
        private PrintWriter pw;

        public ServerWorkerThread( File client_data, Socket client) {
            this.client_data = client_data;
            this.client = client;
        }

        @Override
        public void run() {
//            super.run();
            try {
                DataInputStream dis=new DataInputStream(client.getInputStream());
                int count=dis.readInt();
                String row=client.getInetAddress().getHostAddress()+" "+client.getPort()+" "+ count;
                PrintWriter pw=new PrintWriter(new FileWriter(client_data,true);
                semaphore.acquire();
                pw.println(count);
                pw.flush();
                semaphore.release();
            } catch (IOException | InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;

public class TCPClien extends Thread {
    private PrintWriter pw;
    private Socket connection;
    private File FolderOutput;
    private File otdFile;

    public TCPClien(File folderOutput) throws IOException {
        this.FolderOutput = folderOutput;
        this.connection=new Socket(InetAddress.getLocalHost(),3398);
        this.otdFile=new File(FolderOutput,"files.otd");
        this.otdFile.createNewFile();
        this.pw=new PrintWriter(new FileWriter(otdFile,true));
    }

    public int findFiles(File fileToSearch) throws IOException {
        File [] files=fileToSearch.listFiles();
        int ChCount=0;
        for (File f:files){
            if(f.isFile()){
                BufferedReader bf=new BufferedReader((new FileReader(f)));

                if((f.getName().endsWith(".txt") || f.getName().endsWith(".otd")) && (f.length()>(10*1024) && f.length()<(100*1024))) {
                    String currentLine=bf.readLine();
                    while(currentLine!=null){
                    String [] words=currentLine.split(" ");
                     for(String word : words){
                    ChCount+=word.length();
                    currentLine=bf.readLine();

                }
                    pw.println(currentLine);
                    pw.flush();
                }
                }


            }
            else if(f.isDirectory()){
                ChCount+=findFiles(f);
            }
        }
        return ChCount;
    }
    public void SendToServer() throws IOException {
        int suma=findFiles(otdFile);
        DataOutputStream dos=new DataOutputStream(connection.getOutputStream());
        dos.write(suma);
        dos.flush();
    }

    @Override
    public void run() {

        try {
            findFiles(new File("neshto.txt");
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
           SendToServer();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {

    }
}