Check for a Null String in Java Apart from StringUtils

Question

Is there any gun shot method to find and check for a null string without getting into exceptions??

Please do not suggest StringUtils class please. I tried everything but i am a not able to compile that with the project. I am using Tomcat and I am programming in the root folder of the tomcat and i have several jsp files which i am not able to link with StringUtils. I am programming using Dreamweaver.

Please Help,

You can open the source code of Apache StringUtils.isBlank or isNull and use the same code within your project. — RaceBase, Jul 09 '13 at 05:37

Bohemian · Answer 1 · 2013-07-09T08:19:21.137

1

Anything wrong with the usual way?

if (str == null)

If by "null" you mean "blank" also, then

if (str == null || str.trim().isEmpty())

edited Jul 09 '13 at 08:19

answered Jul 09 '13 at 05:34

Bohemian

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for blank you need to first trim the string i.e if(str == null) || str.trim().isEmpty()); – veritas Jul 09 '13 at 07:13

score 0 · Answer 2 · answered Jul 09 '13 at 05:44

0

If you want to use like a function in jsp do following:

<%!
 // define a isNull() function
 static boolean isNull(String x){
    return (x == null || x.isEmpty());
 }
%>

then you can use above function anywhere inside JSP like 

<% if (isNull(xxx)){ %>
// html code
<% } %>

answered Jul 09 '13 at 05:44

Bimalesh Jha

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Thanks sooo much... I am loving this.... Doing this project for a temple.... So you all will get transcendental credit... – Abhijeet Jul 09 '13 at 12:57

Check for a Null String in Java Apart from StringUtils

2 Answers2