Is there a faster way to figure out what a negative number in base 8 is?

Hi,
Altough I know that using base 8 in java is rare, I am still curious about ways to convert from a negative decimal number into a base 8 number.
For example, when we want to find out the negative representation of -11 (base 10) in base 8 . I would first convert -11 into the 2's complement representation of base 2 first (i.e. 11 in binary is 00001011; -11 two's complement is then 11110101). I then convert this into base 8 (365). Is there a faster way for this?
I hope i am not confusing everybody.
Thank you.
- nygrl

Octal values from 0 to Integer.MAX_VALUE is
between 0 and 17777777777, and those from
Integer.MAX_VALUE to -1 is from 20000000000 to
37777777777.correction:
Octal values from 0 to Integer.MAX_VALUE is between 0 and 17777777777, and those from Integer.MIN_VALUE to -1 is from 20000000000 to 37777777777.

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