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Editorial Team
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Asked: 2026-06-15T07:24:36+00:00

I’m designing a system which needs a specific collection, it is written in Java.

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I’m designing a system which needs a specific collection, it is written in Java. I need to store the history of prices of stock (dates and time).

One stock can have multiple dates and times as I want to show the previous prices.

Which collection would I use to map a stock id to multiple dates AND times?

I know there are HashTables, but I can’t see how they will work as they still take only a key and a value. I have a stock class, within it I want a collection which takes and a value and a value.

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1 Answer

  1. Editorial Team

    One option would be using google guava multi-map (If you are ok to include third party jars).

    multi-map allows you to add elements with same key.

    Here is simple tutorial.

    EDIT:

    If not allowed to use guava, then another option would be:

    HashMap<String, ArrayList<Stock>> map = HashMap<String, ArrayList<Stock>>()

    Here Stock is simple POJO class with timeStamp and stock symbol.

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