Arrays are Java’s fundamental low-level data structure, used to manage fixed-size collections of items. Chapter 2 introduced ArrayList, which implemented a resizable sequential collection of data items, similar to Python’s lists. Arrays are lower-level, but they’re often the best choice for representing fixed-size collections of items, such as matrices. Arrays are also the basic building block of many higher-level data structures. Therefore, understanding how to create and manipulate basic arrays is an essential skill.
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