vkServerThread.java

import java.net.*;
import java.io.*;

public class vkServerThread extends Thread {
    private Socket clientSocket = null;

    public vkServerThread(Socket socket) {
        super("vkServerMultiThread");
        this.clientSocket = socket;
    }

    public void run() {

        try (
        PrintWriter out =
            new PrintWriter(clientSocket.getOutputStream(), true); //Message that want to send to client
        BufferedReader in = new BufferedReader(
            new InputStreamReader(clientSocket.getInputStream())); //Message that received from client
        ) {
        String inputLine, outputLine;
        // Initiate conversation with client
        vkProtocol protocol = new vkProtocol();
        outputLine = protocol.processInput(null);
        out.println(outputLine);

        while ((inputLine = in.readLine()) != null) {
            outputLine = protocol.processInput(inputLine);
            out.println(outputLine);
            if (outputLine.equals("Bye."))
                break;
        }
        } catch (IOException e) {
        System.out.println("Exception caught when trying to listen on port or listening for a connection");
        System.out.println(e.getMessage());
        }
      }
}