Please need help!!!

  
import java.io.*;
import java.net.*;
import java.util.*;
public class StockQuoteServer {
  private static final int SERVER_PORT = 1701; 
  private static final int MAX_CLIENTS = 50;
  private ServerSocket listenSocket = null;
  private String[] stockInfo;
  private Date stockInfoTime;
  private long stockFileMod;
  private boolean keepRunning = true;
  public static void main(String[] args){
	StockQuoteServer server = new StockQuoteServer();
	server.serverQuotes();
  }
  public StockQuoteServer() {
	try{
	  listenSocket = new ServerSocket(SERVER_PORT, MAX_CLIENTS);
	}catch(IOException excpt){
	  System.err.println("Uable to listen on port " + SERVER_PORT + ": " + excpt);
	  System.exit(1);
	}
  }
  public void serverQuotes(){
	Socket clientSocket = null;
	try{
	  while(keepRunning){
		clientSocket = listenSocket.accept();
		StockQuoteHandler newHandler = new StockQuoteHandler(clientSocket, stockInfo, stockInfoTime);
		Thread newHandlerThread = new Thread(newHandler);
		newHandlerThread.start();
	  }
	  listenSocket.close();
	}catch(IOException excpt){
	  System.err.println("2Failed I/O: " + excpt);
	}
  }
  protected void stop(){
	if(keepRunning){
	  keepRunning = false;
	}
  }
}
class StockQuoteHandler implements Runnable{
  private Socket mySocket = null;
  private PrintStream clientSend = null;
  private File FILE;// = new File("stockquotes.txt");
  private DataInputStream clientReceive = null;
  private String[] stockInfo;
  private Date stockInfoTime;
  public StockQuoteHandler(Socket newSocket, String[] info, Date time){
	mySocket = newSocket;
	stockInfo = info;
	stockInfoTime = time;
  }
  public void run(){
	String nextLine;
	String quoteID;
	String quoteResponse;
	String dataFromFile=null;
	System.out.println("Connected!!!");
	char g;
	try{
	  clientSend = new PrintStream(mySocket.getOutputStream());
	  clientReceive = new DataInputStream(mySocket.getInputStream());
	  while((nextLine = clientReceive.readLine())!=null){
		System.out.println(nextLine);
		dataFromFile = readDataFromFile(nextLine.toUpperCase());
		clientSend.println(dataFromFile);//
		clientSend.flush();
		System.out.println("Was send data: "+dataFromFile);
	  }
	}catch(IOException excpt){
	  System.err.println("3Failed I/O: " + excpt);
	} finally{
	  try{
		if(clientSend != null) clientSend.close();
		if(clientReceive != null) clientReceive.close();
		if(mySocket != null) mySocket.close();
	  }catch(IOException excpt){
		System.err.println("4Failed I/O: " + excpt);
	  }
	}
  }
  private String readDataFromFile(String fileName){
	String fileStr = null;
	if(fileName.indexOf("PSW") == 0){
	  if(UserIsRegistry(fileName.substring(3))){
		FILE = new File("FIRST.txt");
		try{
		  DataInputStream stockInput = new DataInputStream(new FileInputStream(FILE));
		  fileStr = stockInput.readLine();
		  stockInput.close();
		  return "31" + fileStr;
		}catch(IOException excpt){
		  System.err.println("Error reading from file: FIRST.txt " + excpt);
		  return fileStr;
		}
	  }
	  else{
		return "30";
	  }
	}else{
	  FILE = new File(fileName + ".txt");
	  try{
		DataInputStream stockInput = new DataInputStream(new FileInputStream(FILE));
		fileStr = stockInput.readLine();
		stockInput.close();
	  }catch(IOException excpt){
		System.err.println("Error reading from file: "+ fileName + excpt);
		return fileStr;
	  }
	  return fileStr;
	}
  }
  private boolean UserIsRegistry(String UserStr){
	String dataFromFile = null;
	int index1, index2;
	FILE = new File("USERS.txt");
	try{
	  DataInputStream stockInput = new DataInputStream(new FileInputStream(FILE));
	  dataFromFile = stockInput.readLine();
	  stockInput.close();
	}catch(IOException excpt){
	  System.err.println("Error reading from file: USERS.txt " + excpt);
	  return false;
	}
	if(dataFromFile.indexOf(UserStr) != -1)return true;
	else return false;
  }
  protected String getQuotes(String quoteID){
	for(int index = 0; index < stockInfo.length; index++){
	  if(stockInfo[index].indexOf(quoteID) == 0) return "+" + stockInfo[index];
	}
	 return "-ERR UNKNOWN STOCK ID";
  }
}

  public class StockQuoteClient {
  private static final int SERVER_PORT = 1701;
  private String serverName = "<>";
  private Socket quoteSocket = null;
  private DataInputStream quoteReceive = null;
  private PrintStream quoteSend = null;
  private String[] stockIDs;
  private String[] stockInfo;
  private String currentAsOf = null;
  private String my = null;
  public static void main(String[] args){
	StockQuoteClient client = new StockQuoteClient(args);
  }
  public StockQuoteClient(String[] args) {
	String serverInfo;
   // my = args[0];
   serverInfo=contactServer();
	if(serverInfo!=null){
	 currentAsOf=serverInfo.substring(serverInfo.indexO  f(" ")+1);
	}
	getQuotes();
	quitServer();
  }
  protected String contactServer(){
	String serverWelcome=null;
	try{
	  quoteSocket = new Socket(serverName,SERVER_PORT);
	  quoteReceive = new DataInputStream(quoteSocket.getInputStream());
	  quoteSend = new PrintStream(quoteSocket.getOutputStream());
	  serverWelcome = quoteReceive.readLine();
	} catch (UnknownHostException excpt){
	  System.err.println("1Unknown host " + serverName + ": " + excpt);
	} catch (IOException excpt){
	  System.err.println("1File I/O to " + serverName + ": " + excpt);
	}
	System.out.println(serverWelcome);
	return serverWelcome;
  }
  protected String quitServer(){
	String serverBye = null;
	try{
	  if(quoteSend != null) quoteSend.close();
	  if(quoteReceive != null) quoteReceive.close();
	  if(quoteSocket != null) quoteSocket.close();
	} catch(IOException excpt){
	  System.err.println("3Failed I/O to " + serverName + ": " + excpt);
	}
	return serverBye;
  }
  protected boolean connectOK(){
	return (quoteSend != null && quoteReceive != null && quoteSocket != null);
  }
  protected void getQuotes(){
	String response;
	  try{
		quoteSocket = new Socket(serverName,SERVER_PORT);
		quoteReceive = new DataInputStream(quoteSocket.getInputStream());
		quoteSend = new PrintStream(quoteSocket.getOutputStream());
		quoteSend.println(my);
		System.out.println("Send string: " + my + "\n");
		response = quoteReceive.readLine();
		System.out.println("Response string: " + response + "\n");
	  } catch(IOException excpt){
		  System.err.println("4Failed I/O to " + serverName + ": " + excpt);
	  }
  }
}