The Java® Language Specification, Java SE 7 Edition, Fourth Edition

3.4. Line Terminators

A Java compiler next divides the sequence of Unicode input characters into lines by recognizing line terminators.

LineTerminator:    the ASCII LF character, also known as "newline"    the ASCII CR character, also known as "return"    the ASCII CR character followed by the ASCII LF characterInputCharacter:    UnicodeInputCharacter but not CR or LF

Lines are terminated by the ASCII characters CR, or LF, or CR LF. The two characters CR immediately followed by LF are counted as one line terminator, not two.

A line terminator specifies the termination of the // form of a comment (§3.7).

The lines defined by line terminators may determine the line numbers produced by a Java compiler.

The result is a sequence of line terminators ...