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When using System.out.println or System.err.println what is the difference? In a console app they seems to be practically the same.
Is there a way to change this?
The difference is clearly defined here:
http://docs.oracle.com/javase/6/docs/api/java/lang/System.html
There are also methods defined (which you will find in this document) for how to change these streams (System.setErr, System.setOut, System.setIn)