LinkedHashmap的java JSTL更改密钥

Question

我在JSP中有一个linkedHashmap

我想在某些条件下更改它的键，保持值不变。 怎么做

  <c:forEach var="loop" items="${Courses}"
                varStatus="pLoop">

    <c:set var="pKey" value="${pKey+1}"/> <!-- value that needs to be set as new key -->

    <fmt:parseNumber var="tempKey" integerOnly="true" 
                   type="number" value="${loop.key}" />

    <!--Normally key values are set like this in hashmap in jstl --> 

    <c:set target="${Courses}" property="${pKey}" value="something"/>

    <!-- but I want to keep value intact, want to change only key -->                       
</c:forEach>

Answer 1

在地图中，您不会更改关键点。将具有相同值的新密钥放入，然后删除旧密钥