Java: How is a blank character represented?

I had run a mySql query from ant, and had the output in "out.txt". In this file, right after listing the rows in the table, there is:

<-- this line is an empty line

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In Java, i am trying take out.txt and make it more readable. I want to ignore the empty line. I have tried: if (!(myStr.contains("\n") ) but it does not work. I have tried "" and null too.

This line is bothering me because when i add some html tags, it is getting in at the very end, and messing up the way the html table looks.

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So your workflow is database->ant->out.txt->Java-> what? You want to make an empty line more readable? myStr is a String, from the mySql-Query or from reading the file back in? I would first try

 (myStr != null) 

just to be sure, then

 (myStr.isEmpty ())
 // or 
 (myStr.length () == 0)

If you tried "" - was it (myStr == "") or (myStr.equals (""))?