Java
How to Use This Series
Navigate this 30-part Java Collections series effectively. Learn the knowledge pyramid (API, behavior, internals), optimal learning cycles, and personalized paths based on your goals.
Java
Collection Framework Architecture
Explore the elegant design of Java's Collection Framework including core interfaces (Collection, List, Set, Queue, Map), abstract base classes, and design patterns like Template Method and Iterator.
Java
Generics Mastery
Master Java generics for collections: type erasure, wildcards (extends vs super), the PECS principle, and common pitfalls like raw types and heap pollution.
Java
The equals() and hashCode() Contract
Understand the critical equals/hashCode contract that governs HashSet and HashMap behavior. Learn why implementation matters and debug 'vanishing' objects in collections.
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Iterators and Iteration Patterns
Master Iterator internals, fail-fast mechanisms, ConcurrentModificationException, ListIterator for bidirectional traversal, and Spliterator for parallel processing.
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Arrays, BitSet, and Primitives
Explore Arrays utility class, Arrays.asList() gotchas, BitSet for memory-efficient flags, and boxing/unboxing performance considerations with primitive collections.
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ArrayList Deep Dive
Deep dive into ArrayList internals: dynamic array backing, 1.5x growth strategy, capacity management, O(1) random access, and production patterns for pre-sizing.
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LinkedList Deep Dive
Analyze LinkedList's doubly-linked structure, ~40 bytes per node overhead, O(n) random access limitations, and when LinkedList actually outperforms ArrayList.
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List Utilities and Operations
Master the Collections utility class: sorting algorithms, binarySearch semantics, shuffle, and the difference between unmodifiable views and true immutability.
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HashSet Internals
Discover how HashSet is backed by HashMap, uniqueness enforcement through hash/equals, iteration order unpredictability, and pitfalls causing 'duplicates' in sets.
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