While System.err and System.out are both directed by default to the monitor command line, System.err is usually reserved for error messages and System.out is reserved for valid output.

Name: While System.err and System.out are both directed by default to the monitor command line, System.err is usually reserved for error messages and System.out is reserved for valid output.
Brand: Quizplus
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Quizplus · Accepted Answer

System.err is conventionally used for error messages and System.out is used for displaying valid output.