In controller I will get the data as List<List<String>>. How can I display it on Visual force page?
And that List<List<String>> is populated based on user input(Checkbox values).
If it's just List<String> then I could able to display them using datalist
List<String> alist;
then I can use this to display them
<apex:dataList value="{!alist}" var="c">
{!c}
</apex:dataList>
If you have a list of list "List < List < String>>" you will need to do something like :
<apex:repeat value="{!alist}" var="l">
<apex:dataList value="{!l}" var="c">
{!c}
</apex:dataList>
</apex:repeat>
You can show list of list by any below approach
1) first approach
<apex:repeat value="{!ListOfList}" var="List">
<apex:repeat value="{!list}" var="item">
{!item}
</apex:repeat>
</apex:repeat>
2) Second approach
(this approach use when we are creating many tables on layout
<apex:repeat value="{!ListOfList}" var="List">
<apex:pageblocktable value="{!list}" var="item">
{!item}
</apex:pageBlockTable>
</apex:repeat>
