Server.java

import java.net.*;
import java.io.*;
class Server
{
    ServerSocket server ;
    Socket socket ;
    BufferedReader br;
    PrintWriter out ;
    public Server(){
        try {
            server = new ServerSocket(7777);
            System.out.println("server is ready to accept connections");
            System.out.println("waiting.......");
            socket = server.accept();
            br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            out = new PrintWriter(socket.getOutputStream());

            startReading();
            startWriting();

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        

    }
    public void startReading(){
        
        Runnable r1 =()->{
            System.out.println("reader started......");
            try{
            while(true){
                
               String msg =br.readLine();
               if (msg.equals("stop")){
                System.out.println("client terminated the chat ");
                
                break;

               }
               System.out.println("user :"+ msg);
            }
        } catch(Exception e){
            //e.printStackTrace();
            System.out.println("connection closed");
        }   

        };
        new Thread(r1).start();
    }
    public void startWriting(){
Runnable r2 =()->{
    System.out.println("writer started......");
    try{
while(!socket.isClosed()){
    
        BufferedReader br1 = new BufferedReader( new InputStreamReader(System.in)); 
        String content = br1.readLine();
        out.println(content);
        out.flush();
        if(content.equals("stop")){
            socket.close();
            break;
        }
    
}
System.out.println("connection closed");
} catch(Exception e){
    e.printStackTrace();
    
}
};
new Thread(r2).start();
    }
 public static void main(String[] args) {
    System.out.println("this is server .... going to start server");
       new Server(); 
    }
}