Xcode and python and java
I think Xcode 4 does not support Java or python so I would be interested in seeing what the chat said. OSX does support both.

Xcode was never a very good IDE for java or python so I would always try to use something else (except if using PyObjc)

Look on Stack Overflow for suggestions of IDEs

IntelliJ/PyCharm and Eclipse work on OSX as do several others