Java prints output twice in a very specific circumstance

Question

System.out.print("My string: ");

My string: BUILD SUCCESSFUL (total time: 1 second)

System.out.print("My string  ");

My string BUILD SUCCESSFUL (total time: 1 second)

System.out.print("My string:  ");

My string: My string:
BUILD SUCCESSFUL (total time: 1 second)

Printing a string that ends with a colon and two spaces will make it print twice. What is happening here?

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Edit: looks like it's a bug in Netbeans indeed

http://netbeans.org/bugzilla/show%5Fbug.cgi?id=167279

Answer 1

I think the output stream's buffering is making you interpret what you see wrongly. Try using println().

Answer 2

I noticed that behavior on Netbeans, when running JUnit tests. It that also your case? Seems to be just a bug.

Answer 3

Which java version do you have? It doesn't happen in 1.6.0_16

Are you sure it's not some danging lines in the unix shell (if you're on unix)?. Try with Systems.out.println("My string: ");