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. Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. From Java 10, you can use the var keyword to declare an ArrayList variable without writing the type twice. The compiler figures out the type from the value you assign.
YouTube Excerpt: Arrays vs. ArrayLists - What's the difference? How do you use each of them, and which one should you use and why? We'll go ...
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