If you have learned another programming language before, you should be able to easily learn enough Java to write UDFs for the most common requirements within a couple of days by simply googling "Free Java Tutorial" and following one of the many results that strikes your fancy. It really is more scripting than "real" Java programming, so I don't think a formal course is necessarily required.
Hi Matthew!
In addition to Patrick's answer, I would recommend to spend some time for reading good books, for example, "Thinking in Java", for better understanding java essentials. Java development in PI is not limited by writting UDFs only.
Regards, Evgeniy.
learn about java oops concepts and API.
in pi also whether it is UDF or java mapping or adapter module, you have to use sap's java api.
by googling you can find many tutorials and forums.
https://javaranch.com/ is very friendly place where you can ask any silly questions. No matter how silly it is still they will help you.
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