Why can't I use \u000D and \u000A as CR and LF in Java?
Unicode escapes are pre-processed before the compiler is run. Therefore, if you put \u000A
in a String literal like this:
String someString = "foo\u000Abar";
It will be compiled exactly as if you wrote:
String someString = "foo
bar";
Stick to \r
(carriage return; 0x0D
) and \n
(line feed; 0x0A
)
Bonus: You can always have fun with this, especially given the limitations on most syntax highlighters. Next time you've got a sec, try running this code:
public class FalseIsTrue {
public static void main(String[] args) {
if ( false == true ) { //these characters are magic: \u000a\u007d\u007b
System.out.println("false is true!");
}
}
}
Because it falls within the range of Unicode Control characters
Which is U+0000–U+001F
and U+007F
.
Unicode control characters are used to control the interpretation or display of text, but these characters themselves have no visual or spatial representation.
They can be escaped by using \
like described in above answer by @Mark
FROM RFC:
2.5. Strings
The representation of strings is similar to conventions used in the C family of programming languages. A string begins and ends with quotation marks. All Unicode characters may be placed within the quotation marks except for the characters that must be escaped: quotation mark, reverse solidus, and the control characters (U+0000 through U+001F).
Any character may be escaped.