Web Reference: 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. 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. 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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