Question

I am trying to get data out of a list,but facing some issue while getting the data.

List<Field> errorFieldList;
Set<String> formValidationResult = new HashSet<String>();

Here the data added to validationResults is like and errorFieldList size is two having Id and type

validationResults.put(errorFieldList, formValidationResult);

public ValidationResponseErrorView(
            Map<Object, Set<String>> validationResults, String exceptionMessage) {
    if (validationResults.size() > 0) {
    for (Map.Entry<Object, Set<String>> entrySet : validationResults
                    .entrySet()) {
                Map<String, Object> fieldResultsMap = new HashMap<String, Object>();
                Object objField = entrySet.getKey();
              if (objField instanceof List) {
                    for (int i = 0; i < ((List<Map<String, Object>>) objField)
                            .size(); i++) {
                        LOGGER.info("in array list----" + objField);
                    }

        }
          }
      }
}

I am not sure how to get data out of objField.

Answer 1

Your code is really hard to read and contains a lot of inconsistencies. Especially in your constructor you declare validationResults as

Map<Object, Set<String>> validationResults

But in your introduction you declare it as

List<Field> errorFieldList;
Set<String> formValidationResult = new HashSet<String>();
validationResults.put(errorFieldList, formValidationResult);

which means your Object is a List<Field>. So now you can simply use:

objField.get(i);

to retrieve the values, where i is your index you iterate over. HOWEVER: your code probably won’t compile, since you try to cast the List<Field> to List<Map<String, Object>> in the 2nd for loop.

Simply put: rework the code, A Map has getter methods for the key and over a Set you need to iterate. Check first what data structure you need. Don’t nest too deep.