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Editorial Team
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Asked: 2026-06-16T00:04:55+00:00

I need a double table from which I get two values from a key

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I need a double table from which I get two values from a key or index. I have seen this question already and I want to know what would be a better approach considering also performance.

1) Create a HashMap on this way:

HashMap<Integer, HashMap<String, String>> = ...;

I don’t know how to put values inside this the put method, I have this and Eclipse gives me an error prueba.put(0, new Hashtable<"Hi", "Bye">); As you can see I have never used something like this before I am sure is a simple question.

2) Create a HashMap on this way:

HashMap<Integer, YourFancyDatatype>

So I create a class which pack the two or more values I want to have in one Object inside a single key or index.

Which would perform better ? Also if you can help me about how to use number 1) approach. The HashMap will have about 20000 entries.

Thank you very much for your time and help 🙂

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1 Answer

  1. Editorial Team

    You would want something with a single key and a collection of values. I would suggest using Apache’s MultiMap, as they already implement this functionality for you.

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