Web Reference: 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. 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. The ArrayList class is used to implement resizable-arrays in Java. In this tutorial, we will learn about the ArrayList class and its methods with the help of examples.
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