Web Reference: 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. Jan 16, 2026 · This blog will guide you through the fundamental concepts, usage methods, common practices, and best practices of using an integer ArrayList in Java. What is an ArrayList? An ArrayList is a class in the Java Collections Framework that implements the List interface.
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