Implementing a Work Queue
The work queue is thread-safe so that multiple threads can simultaneously add and remove objects from it. 

 class WorkQueue {
   LinkedList queue = new LinkedList();
   public synchronized void addWork(Object o) {
     queue.addLast(o);
     notify();
   }
   public synchronized Object getWork() 
     throws InterruptedException {
       while (queue.size() == 0) {
          wait();
       }
       return queue.removeFirst();
   }
 }