BinarySearch Dictionary

[mihailmihai484]

Hello everyone, I tried in this code to make a binarysearch dictionary in a text file using ArrayList and socket, but I don't know what happen that I can't do this..?
Client code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;
import java.util.Arrays;

public class Client {

    public static void main(String[] args) {
        int N;
        Scanner sc=new Scanner(System.in);
        Socket cs=null;
        BufferedReader bfr=null;
        PrintWriter pw=null;
        try{
            cs=new Socket("localhost",5000)	 ;
            InputStreamReader isr=
                    new InputStreamReader(cs.getInputStream());
            bfr=new BufferedReader(isr);
            pw=new PrintWriter(cs.getOutputStream());
            System.out.println("S-a setat reteaua");
            for(;;){

                System.out.print("Se introduce cuvantul: ");
                String cuvant=sc.nextLine();
                //daca este STOP : se va deconecta
                if(cuvant.equals("STOP")) {pw.println(""); pw.flush();break;}
                else  {pw.println(cuvant); pw.flush();}
                //Citim raspuns server:
                String textIn=bfr.readLine();
                if(textIn==null)break;
                System.out.println(textIn);
            }//for;;
        }catch( IOException e){
            e.printStackTrace();
        }
        System.out.println("Client m-am deconectat !");
    }//main
}

ClientHandler:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;
import java.util.Arrays;

public class Client {

    public static void main(String[] args) {
        int N;
        Scanner sc=new Scanner(System.in);
        Socket cs=null;
        BufferedReader bfr=null;
        PrintWriter pw=null;
        try{
            cs=new Socket("localhost",5000)	 ;
            InputStreamReader isr=
                    new InputStreamReader(cs.getInputStream());
            bfr=new BufferedReader(isr);
            pw=new PrintWriter(cs.getOutputStream());
            System.out.println("S-a setat reteaua");
            for(;;){

                System.out.print("Se introduce cuvantul: ");
                String cuvant=sc.nextLine();
                //daca este STOP : se va deconecta
                if(cuvant.equals("STOP")) {pw.println(""); pw.flush();break;}
                else  {pw.println(cuvant); pw.flush();}
                //Citim raspuns server:
                String textIn=bfr.readLine();
                if(textIn==null)break;
                System.out.println(textIn);
            }//for;;
        }catch( IOException e){
            e.printStackTrace();
        }
        System.out.println("Client m-am deconectat !");
    }//main
}

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Arrays;

import static java.util.Collections.binarySearch;

//Clasa firului de execuție pentru tratarea clientului conectat la server:
class FirClient extends Thread {
    private Socket cs;
    private BufferedReader bfr;
    private PrintWriter pw;
    ArrayList<String> listaucvinte;//la creare firului incarcam datele
    // din fisier intr-un ArrayList


    public FirClient(Socket cs) {
        try {
            this.cs = cs;
            pw = new PrintWriter(cs.getOutputStream());
            InputStreamReader isr =
                    new InputStreamReader(cs.getInputStream());
            bfr = new BufferedReader(isr);
            //incarcam fisierul cuvinte .txt in ArrayList:
            listaucvinte = new ArrayList<String>();
            System.out.println("Se copiaza fisier in al");
            FileReader f = new FileReader("D://date1.txt");
            BufferedReader bf = new BufferedReader(f);
            for (; ; ) {
                String s = bf.readLine();
                if (s == null) break;//s-a terminat fisier
                listaucvinte.add(s);
            }
            listaucvinte.sort(String::compareTo);
            bf.close();
            f.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }

    public static int CautareBinara(ArrayList<String> listaucvinte, String cuvant) {
        int start = 0;
        int sfarsit = (listaucvinte.size()) - 1;


        while (start <= sfarsit) {
            int mijloc = start + (sfarsit - start) / 2;
            if (listaucvinte.get(mijloc).compareTo(cuvant) < 0) {
                start = mijloc + 1;
            } else if (listaucvinte.get(mijloc).compareTo(cuvant) > 0) {
                sfarsit = mijloc - 1;
            } else {
                return mijloc;
            }
        }
        return -1;
    }

    public void run() {
        try {
            for (;;) {
                String cuvant = bfr.readLine();
                if (cuvant == null) break;
                if (cuvant.equals("")) break;
                //cautare cuvant in ArrayList:
                for (int i = 0; i < listaucvinte.size(); i += 2) {
                    String crt = listaucvinte.get(i);
                    int r = CautareBinara(listaucvinte, cuvant);
                    if (r == -1)
                        pw.println("Elementul nu s-a gasit!");
                               else
                    pw.println("Elementul este prezent la indexul " + cuvant);
                    pw.flush();
                }


            }//for;;
        }
        catch(Exception e){e.printStackTrace();}
    }
}