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).

\n	New line
  \t	Tab
  \b	Backspace
  \r	Carriage return
  \f	Formfeed
  \\	Backslash
  \'	Single quotation mark
  \"	Double quotation mark
  \d	Octal
  \xd	Hexadecimal
  \ud	Unicode character