Someone

public class MultiClient implements Runnable {
	static long[] times = new long[25];

	String hostname = null;

	int port = -1;

	private int menuCommand = -1;

	private int id = -1;

	private long startTime = -1;

	private long stopTime = -1;

	private long runTime = -1;

	Socket clientSocket = null;

	DataOutputStream os = null;

	BufferedReader is = null;

	public MultiClient(String hostname, int port, int menuCommand, int id) {
		this.hostname = hostname;
		this.port = port;
		this.menuCommand = menuCommand;
		this.id = id;

		try {
			clientSocket = new Socket(hostname, port);
			Date mydate = new Date();
			startTime = mydate.getTime();
			os = new DataOutputStream(clientSocket.getOutputStream());
			is = new BufferedReader(new InputStreamReader(clientSocket
					.getInputStream()));
		} catch (UnknownHostException e) {
			System.err.println("Don't know about host: " + hostname);
		} catch (IOException e) {
			System.err.println("Couldn't get I/O for the connection to: "
					+ hostname);
		}

	}

	public void run() {
		try {

			os.writeBytes("4" + "\n");

			String responseLine;
			while (!(responseLine = is.readLine()).equals("endprocess")) {
			}
			Date mydate = new Date();
			stopTime = (mydate.getTime());
			os.writeBytes("7");

			runTime = stopTime - startTime;
			times[id] = runTime;

			Client2.times[id] = times[id];
			Client2.numClients--;

			os.close();
			is.close();
			clientSocket.close();

		} catch (UnknownHostException e) {
			System.err.println("Trying to connect to unknown host: " + e);
		} catch (IOException e) {
			System.err.println("IOException:  " + e);
		} catch (NullPointerException e) {
			System.err.println("NPE: " + e + " \n");
			e.printStackTrace();
		}

	}
}