question: public static String javaDecode ( String s ) { int length = s . length ( ) ; StringBuilder buff = new StringBuilder ( length ) ; for ( int i = 0 ; i < length ; i ++ ) { char c = s . charAt ( i ) ; if ( c == '\\' ) { if ( i + 1 >= s . length ( ) ) { throw getFormatException ( s , i ) ; } c = s . charAt ( ++ i ) ; switch ( c ) { case 't' : buff . append ( '\t' ) ; break ; case 'r' : buff . append ( '\r' ) ; break ; case 'n' : buff . append ( '\n' ) ; break ; case 'b' : buff . append ( '\b' ) ; break ; case 'f' : buff . append ( '\f' ) ; break ; case '#' : buff . append ( '#' ) ; break ; case '=' : buff . append ( '=' ) ; break ; case ':' : buff . append ( ':' ) ; break ; case '"' : buff . append ( '"' ) ; break ; case '\\' : buff . append ( '\\' ) ; break ; case 'u' : { try { c = ( char ) ( Integer . parseInt ( s . substring ( i + 1 , i + 5 ) , 16 ) ) ; } catch ( NumberFormatException e ) { throw getFormatException ( s , i ) ; } i += 4 ; buff . append ( c ) ; break ; } default : if ( c >= '0' && c <= '9' ) { try { c = ( char ) ( Integer . parseInt ( s . substring ( i , i + 3 ) , 8 ) ) ; } catch ( NumberFormatException e ) { throw getFormatException ( s , i ) ; } i += 2 ; buff . append ( c ) ; } else { throw getFormatException ( s , i ) ; } } } else { buff . append ( c ) ; } } return buff . toString ( ) ; }
target:  Decode a text that is encoded as a Java string literal. The Java properties file format and Java source code format is supported.