| Collections Framework |
Collection Interface, Map Interface, Iterator, Iterable |
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| Core Interfaces |
List, Set, Queue, Deque, Map, SortedMap, NavigableMap |
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| List Implementations |
ArrayList, LinkedList, Vector, Stack |
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| Set Implementations |
HashSet, LinkedHashSet, TreeSet |
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| Queue Implementations |
PriorityQueue, ArrayDeque, BlockingQueue |
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| Map Implementations |
HashMap, LinkedHashMap, TreeMap, Hashtable, ConcurrentHashMap |
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| Legacy Collections |
Enumeration, Vector, Hashtable, Properties |
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| Iteration Techniques |
Iterator, ListIterator, For-Each, Stream Iteration |
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| Utility Classes |
Collections Class, Arrays Class, Comparator, Comparable |
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| Sorting & Searching |
Comparable, Comparator, Collections.sort(), Binary Search |
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| Synchronization |
Synchronized Collections, CopyOnWriteArrayList, Concurrent Collections |
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| Concurrent Collections |
ConcurrentHashMap, ConcurrentLinkedQueue, BlockingQueue, CopyOnWriteArraySet |
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| Performance Considerations |
Time Complexity, Space Complexity, Big-O of Collection Operations |
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| Streams & Collections |
Stream API Integration, Collectors, Parallel Streams, Mapping/Reducing |
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| Custom Implementations |
Custom Comparator, Custom Collection, Wrapper Classes |
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| Weak & Special Collections |
WeakHashMap, IdentityHashMap, EnumMap, Soft References |
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| Advanced Data Structures |
LinkedHashMap (access order), TreeMap with Custom Comparator, PriorityQueue Customization |
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| Best Practices |
Choosing Right Collection, Fail-Fast vs Fail-Safe, Memory Considerations |
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| Garbage Collection & References |
WeakReference, SoftReference, PhantomReference in Collections |
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| Real-time Use Cases |
Caching with Maps, Thread-Safe Queues, LRU Cache with LinkedHashMap |
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