Web Reference: May 17, 2025 · A HashMap is an important part of the Java collections framework and implements the Map interface. It stores items as key-value pairs, where each key is unique and is used to fetch the associated value. It is one of the most commonly used data structures for storing key-value pairs. 1 day ago · Insertion order is not preserved in HashMap. To preserve the insertion order, LinkedHashMap is used and to maintain sorted order, TreeMap is used. HashMap allows one null key and multiple null values. If a null key is added multiple times, it overwrites the previous value. 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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