Why some of the Unicode character literals can't be used in Java source code?

Java provides escape sequences for several non-graphical characters. All characters can be specified as a hexidecimal Unicode character (\uxxxx) with some as an octal character (\ddd where the first d is limited to 0-3, and the others 0-7 - same as \u0000-\u00ff). There are certain special characters which can be represented by escape sequences:

Esc Char	Unicode	Definition
\b	\u0008	backspace
\t	\u0009	tab
\n	\u000a	newline(line feed)
\f	\u000c	form feed
\r	\u000d	carriage return
\"	\u0022	double quote
\'	\u0027	single quote
\\	\u005c	backslash

The compiler translates Unicode characters at the first step of the compile cycle.

Using the Unicode escape characters '\u000a' for newline and '\u000d' for return in a String or comment produces a compile-error as they are interpreted, literally, as 'end-of-line'.

Instead, you should use the equivalent escape sequences: '\n' or '\r'.