How do variables behave in a HashMap regarding keys and values?

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In a HashMap, duplicate values are indeed allowed. This means that you can associate multiple keys with the same value, which is useful in various scenarios. For example, if you want to associate different products (keys) with the same price (value), a HashMap allows that flexibility. Each key must be unique, but the values can be duplicates across different keys.

Understanding this behavior is essential for leveraging HashMaps effectively. They store data as key-value pairs where the uniqueness of the key is critical for retrieving the associated value, while the same value can be linked to various keys without any restrictions. This feature is significant in cases where the same outcome (value) is pertinent to different inputs (keys).

The concept of keys needing to be unique while allowing duplicate values is fundamental to how HashMaps operate and is a distinguishing characteristic of this data structure.