Need help on guide of java mapping

HI,
I want to learn java mapping. I searched in blogs but I am not comfortable to understand. Can anyone explain me the step by step process.
Thanks,
Enivass

Hi enivas,
Having basic understanding about J2SE will be great help for you. Please check these links about Java Mapping step by step
Implementing a Java Mapping in SAP PI /people/carlosivan.prietorubio/blog/2007/12/21/implementing-a-java-mapping-in-sap-pi
XI Java Mapping Helper (DOM) /people/alessandro.guarneri/blog/2007/03/25/xi-java-mapping-helper-dom
Debugging Java Mappings using SAP Netweaver Developer Studio /people/christian.drumm/blog/2008/09/30/debugging-java-mappings-using-sap-netweaver-developer-studio
Handling and Tracing Runtime Exceptions in Java Mapping /people/prasannakrishna.mynam/blog/2009/07/21/handling-and-tracing-runtime-exceptions-in-java-mapping
SAP PI Java API has changed a lot from PI7.0 to PI7.1. http://wiki.sdn.sap.com/wiki/display/XI/UsingPI7.1APIforJavamapping
Check them out in this link Javadocs Index http://www.sdn.sap.com/irj/sdn/javadocs. Blogs mentioned use old API, but once you get idea about Java mapping switching to new API will be easy. Java help is easily available on net, use Google more. Happy learning.
Regards,
Raghu_Vamsee

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It is said that there is only one natural number n such that n-1 is a square and
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String a,b;
double n,x,y,z;
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OK I'll bite.
I assume that this is some kind of assignment.
What is the program supposed to do?
1. Figure out the value of N
2. Given an N determine if it is the correct value
I would expect #1, but then again this seem to be a strange programming assignment to me.
// additions followI see by the simulpostings that it is indeed #1.
So I will give the tried and true advice at the risk of copyright infringement.
get out a paper and pencil and think about how you would figure this out by hand.
The structure of a program will emerge from the mists.
Now that I think about it that advice must be in public domain by now.
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Here's an update on my program. I've worked on certain details and would need your comments whether it contains errors. I'd also want to know if it would work or not because i don't know how to check it on my computer.
Here's the update:
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