Java Map With Two Keys
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Java Map With Two Keys
In this short tutorial, we'll explore different map implementations that accept all case variations of a string as the same key. Stick with the standard apis and add a collection class like a ‘vector’ or ‘arraylist’ to your map or set. A combined key usually concatenates the two keys from the nested structure with a dot in between.
Use the multimap and multivaluemap classes from the apache commons library. There are two ways to think of a multimap conceptually : This is demonstrated below for two keys.
Learn to merge two hashmaps in java.
* it is not mandatory to use both keys as hierarchy, user can use two keys to store * the values and use either of the key to retrieve it. We can “flatten,” i.e., convert from nested map structure to a single map structure: We'll implement a simple method to check which keys have the same value in both hashmaps using stream api: Note that we can easily extend the solution to any number of keys.
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