public static void main(String[] args) throws IOException {
        Socket socket=new Socket(InetAddress.getLocalHost(), 9999);
        new User(socket.toString(),socket.getInputStream()).run();


    }

	public void addMessage(User user, String message) {
		if (!this.users.contains(user)) {
			this.users.add(user);
			System.out.println("User " + user.getName() + " loggon" + System.lineSeparator());
		}
		
		this.chat.add(message);
		
		System.out.println(user.getName() + ": " + this.chat.get(this.chat.size() - 1) + System.lineSeparator());
	}

	public void start() {
		try {
			BufferedReader in = new BufferedReader(this.stream);

			String line="";
			while ((line= in.readLine()) != null) {
				Chat.CHAT.addMessage(this, line);
				if (line.equalsIgnoreCase("exit"))
					break;
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			System.out.println("User disconnect");
		}
	}

int i = 0;
			while(endless){
				client = server.accept();
				
				System.out.println("Got a connection from " + client.getInetAddress());
				
				User user = new User("user_" + i++, client.getInputStream());
				
				Thread thread = new Thread(user);
				thread.start();
				out = new PrintWriter(client.getOutputStream(), true);
				out.println("You have reached server " + client.getInetAddress() + " Have a nice day!");
				
			}

public class User implements Runnable {

    private String name;

    private InputStreamReader stream;

    public User(String name, InputStream stream) {
        this.stream = new InputStreamReader(stream);
        this.name = name;
    }

    @Override
    public void run() {
        this.start();
    }

    public void start() {
        try {
            BufferedReader in = new BufferedReader(this.stream);

            String line = "";
            while ((line = in.readLine()) != null) {
                Chat.CHAT.addMessage(this, line);
                if (line.equalsIgnoreCase("exit"))
                    break;
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            System.out.println("User disconnect");
        }
    }

    public String getName() {
        return name;
    }