What is the difference between system.out.println and system.err.println

It must be: Difference between? The java. System provides 3 static fields System. Standard Error stream by default connects the program system console screen and is commonly used to display error messages to the user.

The Standard Input stream connects the program to the system keyboard device and provides capability to the program to read from keyboard input.

Java provides facilities by which these streams can be redirected to other sources or destinations and change the way the program behaves.

Skip to content Java. What is the difference between System. Both statements use different output streams. In the code snippet System. The default behavior of the statements is to print the log in the console. But it can randomly choose what to print next to console, if you use both of these.

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Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 11 years, 4 months ago. Active 1 year ago. Viewed k times. Improve this question. Add a comment.

Active Oldest Votes. Improve this answer. Carlos G. Although this may seem obvious, many developers do not understand why errors and debugging use System. If you use Err to print out a string, the console in eclipse will appear in red. When outputting a stream, the JVM and the operating system collectively decide when to output the stream.

That is, although the developer has typed:. This stream is open and ready to accept output data. Typically, this stream corresponds to the display output or another output target specified by the host environment or user.

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