Multiple Values Per Key in Java Maps Example

Published: 21 September 2020
on channel: Cameron McKenzie

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Struggling to find a way to put multiple values per key in a Java map? This example tutorial demonstrates three separate ways to create Java collection classes that allow multiple values per key. Here's a write up of the steps in TSS:

https://www.theserverside.com/blog/Co...

One pure JDK APIs approach is to creatively use an ArrayList as a value, the other is to use come classes from Apache Commons and the third is to use the Google Guava Multimap class. Each of these allow you to have multiple values per key in a Java map, HashMap, HashTable or whatever key-value pair driven Java collection class you choose.

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