Module 11: Collections Framework Deep Dive
Queue & Deque Implementations
Use PriorityQueue, ArrayDeque, and BlockingQueue variants.
ArrayDeque is a resizable array-based deque with O(1) push/pop at both ends.
PriorityQueue orders elements by priority; implement Comparable or supply Comparator.
Blocking queues (LinkedBlockingQueue, ArrayBlockingQueue) coordinate producer/consumer flows.