How to interrupt a BlockingQueue which is blocking on take()?

If interrupting the thread is not an option, another is to place a "marker" or "command" object on the queue that would be recognized as such by MyObjHandler and break out of the loop.

BlockingQueue<MyObj> queue = new ArrayBlockingQueue<MyObj>(100);
MyObjectHandler handler = new MyObjectHandler(queue);
Thread thread = new Thread(handler);
thread.start();
for (Iterator<MyObj> i = getMyObjIterator(); i.hasNext(); ) {
  queue.put(i.next());
}
thread.interrupt();

However, if you do this, the thread might be interrupted while there are still items in the queue, waiting to be processed. You might want to consider using poll instead of take, which will allow the processing thread to timeout and terminate when it has waited for a while with no new input.