File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java in General and the fly likes String validation Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Java in General
Bookmark "String validation" Watch "String validation" New topic

String validation

trupti nigam
Ranch Hand

Joined: Jun 21, 2001
Posts: 613
Hello all,

In my code I have declared a String name;

An I am doing following validations..
if(name == null)
{doSomething; }
else if(name != null){do Somethign;}

What I have observed is when I write if(name != null)condiiton before if(name == null)condiiton, when the name is not null the if(name != null) condiiton is ignored.
but if works fine as mentioned in the first para.

why is this happening?

pascal betz
Ranch Hand

Joined: Jun 19, 2001
Posts: 547
since a value can be either null or not null there is no need for both conditions:

is how you can validate your strings.

if the conditions are exclusive, then the order is not important.

Ben Ethridge
Ranch Hand

Joined: Jul 28, 2003
Posts: 108
I agree with Pascal, but just for the sake of argument, I wrote a simple one:

Works ok for me. You sure there isn't something else going on (maybe some subtlety) in your code?

Point of TV trivia: Who (or should I say what) used to shout the String I have in the else above?

SCJB 1.4
I agree. Here's the link:
subject: String validation
It's not a secret anymore!