Java Required in SAP XI

Hey Guys
i have my background in ABAP but i wanna know JAVA too,i dont want to go for installation or admin but jst need some links which i can study to get an idea about how much of JAVA is required for a XI developer.
Thanx
Ahmad

Hi Ahmad
      You are correct ...Java will be help you lot in XI in particular mapping and modules
     And in addition to above res
     Start up with Core Java like
    1) OOPS very basics
    2) Exceptions
    3) Collections
    4) I/O Streams
        Just read theory on this try to look at the existing examples then go practicing you own examples
Links : www.java.sun.com
              www.java2s.com
    The above links will alomst all the information about Java
    This will be enough for Mapping UDF in XI
But if want write your own modules then you should know some extend J2ee(EJB)
it will take little time and practice...but If know Core Java rest all easy
I hope this will help you
Regards
Prasad

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<removed_by_moderator>
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