Module 11: Collections Framework Deep Dive
Map Implementations: HashMap, TreeMap, LinkedHashMap
Store key/value pairs with predictable performance and ordering.
HashMap offers O(1) operations; default load factor 0.75 balances speed/memory.
LinkedHashMap maintains insertion or access order (useful for LRU caches).
TreeMap keeps keys sorted and provides navigational methods; key type must be Comparable or supply a Comparator.