Java code samples for java mappings

Dear all,
Can you please send me a sample scenario in which you used the java mapping.
How do we assign the source structure,the target structure.
How do we map source->target
Do we give the source and target interface names in execute method)?
if so where do we map the same.
we have one to one mapping in graphical,message mappings which i worked with.
is there any tool for making the same thing in java?
Kindly send me the documents if any on java mapping to [email protected]
Please clarify.....

ref:
/people/prasad.ulagappan2/blog/2005/06/29/java-mapping-part-i
/people/prasad.ulagappan2/blog/2005/06/29/java-mapping-part-ii
and
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/xi/javaMappingSample+Code&

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