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Editorial Team
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Asked: 2026-06-12T01:37:47+00:00

I ran into following situation and I am wondering about best solution. Let’s say

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I ran into following situation and I am wondering about best solution. Let’s say I have List<Object1> and List<Object2>, these lists are result of two separated queries. Both of them have the same size and there is relationship 1:1 between elements in the lists based on ID. I know that best solution would be fetching data in one DB query but that’s possible right now.

So my question is, what is the best way to join these lists into let’s say List<Object3>?

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1 Answer

  1. Editorial Team

    I would

    • convert the first list into Map with key as the ID and value as Object1.
    • iterate through the second list, get the object1 corresponding to the ID of object2.
    • perform the merge operation or whatever is intended and prepare object3 and put it in a list.

    The resultant order would be that of in second list.

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