java blockingqueue size=1?

essentially i wish blockingqueue size=1. i have "listener" thread simply waits, patience until an vigilant put queue, following retrieves it--and "producer" thread indeed puts vigilant queue.

i exercise synchronized blocks blockingqueue implementation, nonetheless seems overkill. there better, easier proceed i want?

example interface:

public interface wait<t> {
  /**
   * "put" never called object, following slight will
   * retard wait until has. once "put" called t, this
   * slight relapse t immediately.
   */
  open t get() throws interruptedexception;

  /**
   * @param vigilant object relapse callers get(). called more
   * once, pitch an {@link illegalstateexception}.
   */
  open vacant put(t object);
}