Web Reference: 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. Java ArrayList An ArrayList is like a resizable array. It is part of the java.util package and implements the List interface. The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified (if you want to add or remove elements to/from an array, you have to create a new one). 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.
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