Web Reference: Jul 23, 2025 · How to Replace a Element in Java ArrayList? To replace an element in Java ArrayList, set () method of java.util. An ArrayList class can be used. The set () method takes two parameters the indexes of the element that has to be replaced and the new element. The index of an ArrayList is zero-based. Through this tutorial, we’ll take a look at how to replace an element at a specific index in a Java ArrayList. Jan 16, 2026 · In this guide, we’ll explore how to safely and efficiently replace an element in a Java ArrayList using the set() method, with step-by-step instructions, examples, and best practices to handle edge cases.
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