On 07/09/2007, at 7:44 PM, Rainer User wrote:
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);
}
You should never set a boolean flag like this... well yes it works
but is poor style. Better:
return personName == null || personName.equals ("")
booleans can be used in expressions, just like numbers.
In my opinion it would be the same if i write only:
if (personName==null)
No, personName == null and personName.equals ("") are two different
tests. personName != null is a precondition (see Chuck's comments on
DbC) for personName.equals ("") to work.
{
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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