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HashMap is one of the most widely used collections in Java applications, primarily for storing key-value pairs with efficient lookup performance. To understand its inner workings, we explore how it manages data storage, resolves collisions, handles resizing, and why it is not thread-safe. Class Hierarchy and Core Interfaces HashMap implements s ...

HashMap Core Characteristics HashMap implements key-value storage using hash tables, offering non-thread-safe operations. Both keys and values can be null, and entries are unordered. Pre-JDK 1.8, HashMap used array-chaining (linked lists) to resolve collisions. Since JDK 1.8, when bucket chains exceed 8 elements and the array size surpasses 64, ...