CODEWITHSUNDEEP
java
Lavanya
Lavanya

Reputation: 33

How to read Specific Map Key Value in case of an Array Object

I have the following Map structure 

{empId=1234, empName=Mike, CDetails=[{"collegeName":"Peters Stanford","collegeLoc":"UK","collegeLoc":"UK"}]}

I need to read the value collegeLoc from the above Map

I tried this way , its working , but is there any better way 

    myMap.entrySet().stream().filter(map -> map.getKey().equals("CDetails")).forEach(e -> {

            List<Object> objsList = (List<Object>) e.getValue();

            for(int i=0;i<objsList.size();i++)
            {
                HashMap<String,String> ltr = (HashMap<String, String>) objsList.get(i);

                System.out.println(ltr.get("collegeLoc"));
            }



        });

Upvotes: 0

Views: 267

Answers (1)

Bohemian
Bohemian

Reputation: 425013

CDetails is a List, not a Map.

Try this:

empMap.entrySet().stream()
  .map(map -> map.get("CDetails"))
  .filter(Objects::nonNull)
  .flatMap(List::stream)
  .map(element -> ((Map)element).get("collegeLoc"))
  .filter(Objects::nonNull)
  .forEach(System.out::println);

Upvotes: 1

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