help on a null statement

[chaddu1256]

<%
//to test for null values
String va5 = "";
if (request.getAttribute("meterNo&quot.toString().equals("00000000&quot){
va5 = " ";
}
else{
va5 = request.getAttribute("meterNo&quot.toString();
}
%>
<td><div align="center" class="sscolor1"><%= va5%>

Right now I have this code here that is checking a database table for a Meter Number, when the meter number is 00000000 then it just displays a blank, what I want to be able to do is have this statement check for 000000000 and "null" and display a blank if either is present. Is there a way to rewrite or modify this statement to check for both of these?

 

[venur]

Hi,

OR CONDTION (One can be true)

<%if(null == request.getAttribute("meterNo&quot || request.getAttribute("meterNo&quot.toString().equals("00000000&quot){%>
BLANK LINE
<%}else{%>
DISPLAY LINE
<%}%>

AND CONDITION (Both sholuld return true)

<%if(null == request.getAttribute("meterNo&quot && request.getAttribute("meterNo&quot.toString().equals("00000000&quot){%>
BLANK LINE
<%}else{%>
DISPLAY LINE
<%}%>

I think in your case you are looking for OR codition.

Cheers,
Venu

 

[grega]

Like Venur says, when checking a String, always check for null before checking .equals. Using the equals method on a null string will cause an exception, so it's always

if ((myString == null) || (myString.equals("")))
{
  do something;
}

Greg.