QueueListNode < T > function ( ) { return prev ; }
gets the previous node that this node points to . concode_field_sep QueueListNode<T> head concode_elem_sep QueueListNode<T> next concode_elem_sep T payload concode_elem_sep QueueListNode<T> tail concode_elem_sep QueueListNode<T> prev concode_elem_sep int size concode_elem_sep Object lock concode_field_sep void enqueue concode_elem_sep T getPayload concode_elem_sep int getSize concode_elem_sep QueueListNode<T> getHead concode_elem_sep void setPayload concode_elem_sep void setNext concode_elem_sep String toString concode_elem_sep void setPrev concode_elem_sep QueueListNode<T> getNext concode_elem_sep void removeNode