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Asked: 2026-06-07T08:23:37+00:00

I have a collection, a List of Map, the map is Map<String, String> .

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I have a collection, a List of Map, the map is Map<String, String>. I need to query this collection with comparison, logical, like, not in operators. Something like SQL.

I will be populating the list from a database stored procedure, so I am not sure about the size. But, I guess the size should not be more than 10,000 records.

While posting this I am having a look at Apache functors, I don’t know if they will help here.

Other way that I am thinking of is using the in-memory database Derby to achieve this.

Please let me know of any Java library or any other way of doing this.

The maps in the list will be like below:

Map<String, String> m1 = new Map<String, String>();
m1.put("name","Mark");
m1.put("age","21");
m1.put("city","some city");

Map<String, String> m1 = new Map<String, String>();
m1.put("name","David");
m1.put("age","25");
m1.put("city","other city");

I need to query the list to get Map which has:

  1. name=Mark
  2. name=Mark and age > 30
  3. city not in "other city"
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1 Answer

  1. Editorial Team

    I found JFilter which helps you with filtering in-memory data (java objects ). Below is the description from JFilter website.

    JFilter is a simple and high performance open source library to filter (query), map (select) and reduce (aggregate) objects in a Java collection. Query is given in json format like Mongodb queries.

    I have written a post on using JFilter with Maps, which I am using as a generic way of storing data and querying/filtering using JFilter

    Here is the link to the post Using JFilter to query/filter in-memory data

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