question: private char readEscapeCharacter ( ) throws IOException { if ( pos == limit && ! fillBuffer ( 1 ) ) { throw syntaxError ( "Unterminated escape sequence" ) ; } char escaped = buffer [ pos ++ ] ; switch ( escaped ) { case 'u' : if ( pos + 4 > limit && ! fillBuffer ( 4 ) ) { throw syntaxError ( "Unterminated escape sequence" ) ; } String hex = stringPool . get ( buffer , pos , 4 ) ; pos += 4 ; return ( char ) Integer . parseInt ( hex , 16 ) ; case 't' : return '\t' ; case 'b' : return '\b' ; case 'n' : return '\n' ; case 'r' : return '\r' ; case 'f' : return '\f' ; case '\'' : case '"' : case '\\' : default : return escaped ; } }
target:  Unescapes the character identified by the character or characters that immediately follow a backslash. The backslash '\' should have already been read. This supports both unicode escapes "u000A" and two-character escapes "\n".