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I'm reading Effective Java and it uses %n for the newline character everywhere. I have used rather successfully for newline in Java programs.

Which is the 'correct' one? What's wrong with ? Why did Java change this C convention?

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From a quick google:

There is also one specifier that doesn't correspond to an argument. It is "%n" which outputs a line break. A " " can also be used in some cases, but since "%n" always outputs the correct platform-specific line separator, it is portable across platforms whereas" " is not.

Please refer https://docs.oracle.com/javase/tutorial/java/data/numberformat.html

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