CODEWITHSUNDEEP
javahash
Rafa Alvarez-Ossorio Martin
Rafa Alvarez-Ossorio Martin

Reputation: 23

hash string at hash number java

Hiii,I need to do the opposite of what my hash method does, I want a number to convert it to a string, unlike my other method.

I need you to do it in the same way coding as decoding

Upvotes: 0

Views: 193

Answers (2)

aranchal
aranchal

Reputation: 36

I think that you are trying to implement the Vigenère cipher.

I have fixed your code for executing the two functions (hash and hash2) and I have noticed that hash("javaguay") returns the long number 2485697837967351 and then hash2(2485697837967351L) returns yaugavaj, the reverse string that you want.

A quick response could be the next, but I think you must fix your algorithm.

Add these lines to the end hash2 function: 

   String res2 = "";
    for (int i = res.length() -1; i >=0; i--) {
      res2 += res.charAt(i);
    }
    return res2;

Upvotes: 0

Eran
Eran

Reputation: 394026

That would only be possible if there was a 1 to 1 mapping between Strings and longs. Since there are 264 possible long values, and many many more possible String values (even if you limit yourself to Strings of 64 characters, there are still K64 of them, where K is the number of possible unique characters), there cannot be a method that reverses your long hash(String c) method for all possible Strings.

Upvotes: 2

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