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Editorial Team
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Asked: 2026-05-14T20:08:00+00:00

What I need is something like Hashtable which I will fill with prices that

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What I need is something like Hashtable which I will fill with prices that were actual at desired days.

For example: I will put two prices: January 1st: 100USD, March 5th: 89USD.

If I search my hashtable for price: hashtable.get(February 14th) I need it to give me back actual price which was entered at Jan. 1st because this is the last actual price. Normal hashtable implementation won’t give me back anything, since there is nothing put on that dat.

I need to see if there is such implementation which can find quickly object based on range of dates.

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  1. Editorial Team

    Off the top of my head, there are a couple ways, but I would use a TreeMap<Date> (or Calendar, etc).

    When you need to pull out a Date date, try the following:

    1. Attempt to get(date)
    2. If the result is null, then the result is in headMap(date).lastKey()

    One of those will work. Of course, check the size of headMap(date) first because lastKey() will throw an Exception if it is empty.

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