JavaSimpleServer/src/com/company/Client.java

package com.company;

import javax.xml.crypto.Data;
import java.io.*;
import java.net.Socket;
import java.util.List;

public class Client extends Thread {
    // Сокет текущего клиента
    private Socket socket;
    // Список всех подключенных слиентов
    private List<Client> clientList;

    public static int READ_BUFFER_SIZE = 1024;

    public Client(Socket socket, List<Client> clientList) throws IOException {
        this.socket = socket;
        this.clientList = clientList;
    }

    public Socket getSocket() {
        return socket;
    }

    @Override
    public void run() {
       while (!isInterrupted()) {
           try {
               ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());

               Transport t = (Transport) ois.readObject();

               for (Client client : clientList) {
                   if (client.socket != this.socket) {
                       ObjectOutputStream coos = new ObjectOutputStream(client.socket.getOutputStream());
                       coos.writeObject(t);
                       coos.flush();
                   }
               }

               System.out.print("\033[1;31m\033[40m " + t.Name + ": \u001B[0m ");
               System.out.println(t.Message);

           } catch (IOException | ClassNotFoundException exception) {
               System.out.println(exception.getMessage());
               clientList.remove(this);
               System.out.println("Disconnected user " + socket.getRemoteSocketAddress().toString());
               try {
                   socket.close();
               } catch (IOException e) {
                   e.printStackTrace();
               }
               return;
           }
       }
    }
}