ColdFusion 中数组的奇怪行为

Question

我遇到了一段代码的问题，稍作修改我得到了不同的结果，但事实并非如此。

版本 1 给出了正确的结果，我遇到了实际代码版本 2 的问题。

版本 1：

<cfset keywords = listToArray("1,2,3,4,5,6,7,8,9,10")>

<!--- Common Code Below --->
<cfoutput>#getMetadata(keywords).getName()#</cfoutput>

<cfset toBeAdded = keywords>
<cfset toBeInactivated = listToArray("1,3,4,6,8")>
<cfset toBeActivated = toBeInactivated>

<cfset toBeAdded.removeAll(toBeInactivated)>
<cfset toBeInactivated.removeAll(keywords)>
<cfset toBeActivated.retainAll(keywords)>

版本 2：

<cfset keywords = []>
<cfloop from="1" to="10" index="counter">
    <cfset arrayAppend( keywords, counter )>
</cfloop>

<!--- If I add following line here then it is working as expected and similar to version 1:  --->
<!--- <cfset keywords = listToArray(arrayToList(keywords))> --->

<!--- Common Code Below --->
<cfoutput>#getMetadata(keywords).getName()#</cfoutput>

<cfset toBeAdded = keywords>
<cfset toBeInactivated = listToArray("1,3,4,6,8")>
<cfset toBeActivated = toBeInactivated>

<cfset toBeAdded.removeAll(toBeInactivated)>
<cfset toBeInactivated.removeAll(keywords)>
<cfset toBeActivated.retainAll(keywords)>

输出：

要点如下：Version 1 and Version 2。

非常感谢任何建议！

Answer 1

我不是 Java 人，但据我所知...

在版本 1 中：keywords 包含 java.lang.String 个值，在版本 2 中：keywords 包含 java.lang.Double 个值。

在版本 2 中：toBeInactivated 包含要从双精度数组中删除的字符串值。

由于那些 Java 类型不匹配，它们将无法从集合中正确删除。我猜当 CF 传递底层对象数据时，它永远不会正确转换。老实说，当一切对 CF 来说都是无类型的时候，我希望如此。

从下面@Twillen 的评论中添加，这在您将 counter 转换为 java.lang.String 类型时有效：

<cfset keywords = []>
<cfloop from="1" to="10" index="counter">
    <cfset arrayAppend( keywords, javaCast("string", counter) )>
</cfloop>


<!--- Common Code Below --->
<cfoutput>#getMetadata(keywords).getName()#</cfoutput>

<cfset toBeAdded = keywords>
<cfset toBeInactivated = listToArray("1,3,4,6,8")>
<cfset toBeActivated = toBeInactivated>

<cfset toBeAdded.removeAll(toBeInactivated)>
<cfset toBeInactivated.removeAll(keywords)>
<cfset toBeActivated.retainAll(keywords)>

<cfdump var="#toBeAdded#" label="To Be Added">
<cfdump var="#toBeInactivated#" label="To Be Inactivated">
<cfdump var="#toBeActivated#" label="To Be Activated">

Answer 2

ColdFusion 数组不是 Java 集合对象。所以我质疑对此类数组使用 removeAll() 和 retainAll() 。考虑到这一点，我的回答是：

<cfset keywords = createobject("java","java.util.Vector").init()>
<cfset toBeAdded = createobject("java","java.util.Vector").init()>
<cfloop from="1" to="10" index="counter">
    <cfset keywords.add(javaCast("int", counter))>
    <cfset toBeAdded.add(javaCast("int", counter))>
</cfloop>

<!--- Common Code Below --->
<cfoutput>#getMetadata(keywords).getName()#</cfoutput>

<cfset listToBeInactivated = "1,3,4,6,8">
<cfset toBeInactivated = createobject("java","java.util.Vector").init()>
<cfset toBeActivated = createobject("java","java.util.Vector").init()>
<cfloop list="#listToBeInactivated#" index="index">
    <cfset toBeInactivated.add(javaCast("int", index))>
    <cfset toBeActivated.add(javaCast("int", index))>
</cfloop>

<cfset toBeAdded.removeAll(toBeInactivated)>
<cfset toBeInactivated.removeAll(keywords)>
<cfset toBeActivated.retainAll(keywords)>

<cfdump var="#toBeAdded#" label="toBeAdded">
<cfdump var="#toBeInactivated#" label="toBeInactivated">
<cfdump var="#toBeActivated#" label="toBeActivated">

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