How to perform logical comparison using struts

Hi all, I know this is probably not the best forum for a question regarding struts, but am sure most developers here are familiar with it.
how do you implement this using struts logic present or logic no present tags ?
if ((a != null ) && (b != null))
// perform operation
else
// perform altername operation
I am familiar with the stuts logic tags but not sure about the nesting levels to perform this type of operation.
Cheers

<logic:present name="XXXXForm" property="a">
     <logic:present name="XXXXForm" property="b">
          // perform operation
     </logic:present>
</logic:present>
<logic:notPresent name="XXXXForm" property="a">
     <logic:notPresent name="XXXXForm" property="b">
          // perform altername operation
     </logic:notPresent>
</logic:notPresent>
/code]

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