Re: Beginnerquestion about if (personName==null || personName.equals(""))
Re: Beginnerquestion about if (personName==null || personName.equals(""))
- Subject: Re: Beginnerquestion about if (personName==null || personName.equals(""))
- From: Kieran Kelleher <email@hidden>
- Date: Fri, 7 Sep 2007 16:00:16 -0400
And if you want to save yourself the PITA, just throw in apache
commons lang jar into your own foundation framework and use the many
useful standardized utilities that are in there:
http://commons.apache.org/lang/
For example check out StringUtilis.isBlank(...) and
StringUtils.isEmpty(...) at
http://commons.apache.org/lang/api-release/index.html
regards, Kieran
On Sep 7, 2007, at 2:52 PM, Lachlan Deck wrote:
Hi there,
On 07/09/2007, at 7:44 PM, Rainer User wrote:
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);
}
Further to what others have said it is also sometimes helpful to
test for whitespace strings. e.g., " " and treat them as empty
also. And it's often helpful to trim a string of surrounding
whitespace...
public static boolean isEmptyString(String value) {
return value == null || value.matches( "^\\s*$" );
}
public void setFirstName(String firstName) {
if (isEmptyString(firstName))
this.firstName = null;
else
this.firstName = firstName.trim();
}
with regards,
--
Lachlan Deck
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