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3.2 ArrayDeque vs Stack & PriorityQueue Heaps
Topic Summary
Learn why java.util.Stack is obsolete, why ArrayDeque is the modern LIFO/FIFO standard, and how PriorityQueue implements binary heaps.
What You Will Learn
• Replace legacy `Stack` with `ArrayDeque`.
• Implement LIFO stacks and FIFO queues using double-ended circular buffers.
• Use `PriorityQueue` for min-heap and max-heap scheduling.
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