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Beginnerquestion about if (personName==null || personName.equals(""))
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Beginnerquestion about if (personName==null || personName.equals(""))

  • Subject: Beginnerquestion about if (personName==null || personName.equals(""))
  • From: Rainer User <email@hidden>
  • Date: Fri, 7 Sep 2007 11:44:11 +0200

Hi Folks,
i am new at the webobjects-dev maillist and new to webobjects too.

I am reading the white printed book "Webobjects 5, Web Applications", from Apple, it was included in the Webobjects Package of my Webobject-Box.

On Page 84 i found an example where a funktion trys to detect if a variable named "personName" [type of it is "String"] is empty or not.

The substantial Code says:

if (personName==null || personName.equals(""))
{
return(true);
}
else
{
return(false);
}




In my opinion it would be the same if i write only:

if (personName==null)
{
return(true);
}
else
{
return(false);
}

Where is my misunderstanding?
Why i have to use personName.equals("")   +and+    personName==null to detect if personName is empty or not?


Maybe someone can help me ore give me a hint?



Thanks from Germany,

Thomas


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