Conversion of String(text) to BigInteger and reversal(i.e. getting back the text in order)

Question

i am implementing the rsa algorithm, since we have to deal with very large nos, i am using bigInteger datatype. it works fine with numbers but now i will have to test it for strings, how will i cast string to bigInteger and then get back the string....

Answer 1

https://code.sololearn.com/cF0kk5gjC6cY/?ref=app

Answer 2

BigInteger has a constructor that takes a String, and one that takes a String and radix (if you're using other than decimal numbers). It also has a toString() method that returns a decimal representation of the BigInteger.
https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html

Hope this helps!

Answer 3

Alternatively, you could use Character.isDigit () method on each character in the String to see it its a digit?

Answer 4

Thank You...It helps but when characters are there in string, it passes them as BigInteger which produces error. However i have now first converted string to byte array then to byte string and passed as you said...It works!