... because finding the index of an element in a linked list requires searching through the list incrementally from its beginning or end, counting elements as we go. For instance, we could define a ... 5 (3) enqueue (7) - (3, 7) dequeue( ) 3 (7) front( ) 7 (7) dequeue( ) 7 ( ) dequeue( ) "error" ( ) isEmpty( ) 286A Queue Interface in Java A Java interface for the ... only D and Q (and no other variables or objects) and results in D storing the elements (1,2,3,5,4,6 ,7, 8), in this order. R-5.11 Repeat the previous problem using the deque D and an initially...