String illegal escape charcter

StackOverflow https://stackoverflow.com/questions/12533921

  •  03-07-2021
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Question

While answering one of the question, I came across this interesting situation.

If I have string like the following, Netbeans does not complain that it's an illegal start of expression. 

String temp="\19825655.";

As soon as I remove '1' it complains that it's an illegal start of expression.

String temp="\9825655.";

couldn't figure out the reason for this behavior. Any input would be appreciated.

Observation: It seems \9 and \8 has special meaning. Only for \9 and \8 I am getting illegal start of expression. All other combinations it is not complaining.

Was it helpful?

Solution

\1 is an octal escape code. Check it out in the JLS in Escape Sequences for Character and String Literals.

OTHER TIPS

Right, so what this means is that the combination \1 is an escape sequence. However, to my knowledge it isn't a known escape sequence.

EDIT: OK it's an octal number, interesting - \x Escape in Java?

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