Web Reference: An ArrayList keeps elements in the same order you add them, so the first item you add will be at index 0, the next at index 1, and so on. Mar 17, 2026 · ArrayList in Java is a resizable array provided in the java.util package. Unlike normal arrays, its size can grow or shrink dynamically as elements are added or removed. This tutorial will cover all methods of ArrayList with examples and outputs. Additionally, it will highlight key points, use cases, best practices, performance considerations, and a real-time example.
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