Here are a few title options, keeping in mind the question-answer format and the article\'s content: **Option 1 (Direct & Clear):** * **How Can I Store Multiple Values for a Single Key in a Java

HashMap: One Key, Multiple Values

This question explores the possibility of storing multiple values for a single key in a HashMap. In Java, a HashMap is a data structure that maps unique keys to values. However, the typical implementation doesn't allow for multiple values associated with the same key.

To address this issue, one possible solution suggested in the answer is to create a Map of Lists. This approach involves mapping keys to ArrayLists, where each ArrayList can contain multiple values. For example:

<code class="java">Map<Object,ArrayList<Object>> multiMap = new HashMap<> ();</code>

By using a Map of Lists, you can access multiple values associated with a single. In the example provided, to retrieve the third value for the first key, you would access the ArrayList associated with that key and then retrieve the third element.

While libraries exist to simplify this process, the straightforward implementation using a Map of Lists provides a clear understanding of how to handle multiple values for a key in Java.

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