Web Reference: Jul 11, 2025 · ArrayList allows null Values and HashMap allows null key and values. Both ArrayList and HashMap can be traversed through Iterator in Java. In this comprehensive tutorial, we will delve into two of the most commonly used data structures in Java: HashMap and ArrayList. These collections are essential for effective data manipulation, storage, and retrieval, making them indispensable tools for every Java programmer. It is part of the java.util package and implements the Map interface. Instead of accessing elements by an index (like with ArrayList), you use a key to retrieve its associated value.
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