package Producer;import java.util.Vector;public class Server extends Thread {  Client client;  int counter;  public Server(Client _client) {    this.client = _client;    this.counter = 0;  }  public void run() {    while (counter < 10) {      this.client.queue.addElement(new Integer(counter));      counter++;    }    //throw new RuntimeException("counter >= 10");  }  public static void main(String[] args) {    Client c = new Client();    Server s = new Server(c);    c.start();    s.start();  }}class Client extends Thread {  Vector queue;  public Client() {    this.queue = new Vector();  }  public void run() {    while (true) {      if (! (queue.size() == 0)) {        processNextElement();      }    }  }  private void processNextElement() {    Object next = queue.elementAt(0);    queue.removeElementAt(0);    System.out.println(next);  }}