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Struts pre selecting multi select

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Hi <br/>
I am using struts with java.<br/>
I have a string List that contains<br/>
List<String> nameList = new ArrayList<String>();<br/>
nameList = name1, temp, avg1, avg2

my select box(avg) contains values avg1, avg2, avg3, avg4.

Using iterator i had separated the values as<br/>
<s:iterator value="nameList" status="sta1" var="totlis"> <br/>
<s:if test="#sta1.count == 1"><br/>
<s:set var="name" value="%{nameList.get(#sta1.index)}"/><br/>
<s:set var="desc" value="%{nameList.get(#sta1.index+1)}"/><br/>
<s:set var="avgval" value="%{nameList.get(#sta1.index+2)}"/><br/>

<s:select value="%{#avgval}" list="#populate.avg" multiple="true" size="3" />

How can i do multi select.

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