如何遍历哈希表，将值作为给定索引的数组列表

Question

I have an hashmap savedQuestionAnswer with Integer as key and ArrayList as value in the following code

<c:set var="form" value="${surveyQuestionnaire}"/>
    <c:forEach var="questionName" items="${form.questionsList }"  varStatus="theCount">
 Q.<c:out value="${questionName}"></c:out>
<c:forEach items="${savedQuestionAnswer[(theCount.count).longValue()]}" var="choice" varStatus="choiceStatus">
       <br/> ${choiceStatus.count})${choice} 
     </c:forEach> <br/>
</c:forEach>

I am trying to print a questionnaire with multiple answers . So for each question (present in questionName) I have saved the list of answer in the hash map savedQuestionAnswer with corresponding index value .

I am getting a syntax error,

"The function longValue must be used with a prefix when a default namespace is not specified".

Not able to get what is the correct syntax or way to accomplish it

Answer 1

LoopTagStatus.getCount() returns int. Why do you need:

${savedQuestionAnswer[(theCount.count).longValue()]}

Try simply

${savedQuestionAnswer[theCount.count]}

Also note that

• LoopTagStatus.getCount() starts counting at 1
• LoopTagStatus.getIndex() starts counting at 0

so depending on how you populate your HashMap, you should use

theCount.index

or

theCount.count

as a key.