question: private E dequeue ( ) { final Object [ ] items = this . items ; @ SuppressWarnings ( "unchecked" ) E x = ( E ) items [ takeIndex ] ; items [ takeIndex ] = null ; takeIndex = inc ( takeIndex ) ; count -- ; if ( itrs != null ) itrs . elementDequeued ( ) ; notFull . signal ( ) ; return x ; }
target:  Extracts element at current take position, advances, and signals. Call only when holding lock.