using hashmap to compare two strings/characters

[pindo]

i need to write a code that kind of works like an encryption code.
the user will input a string (A-Z, 0-9) this will create a map between the two characters

for example the default string is ABCDEFGHIJKL, the user inputs 1234PQRSTUVW.
1 will map to A, 2 will map to B, 3 to C and so on.
the user can then enter a string and this string will be encrypted with the 'new' numbers/letters.
for example the user will enter string: 'HI' and the output will be 'ST' as 'H' is mapped to 'S' and 'I' to 'T'


any help is much appreciated,
pindo

[Tolls]

What code have you got so far?

[JosAH]

You don't need Maps for that; two simple Strings, one with the encoded characters and one with the decoded characters (as in your example) and the indexOf( ... ) method will be enough.

kind regards,

Jos

[pindo]

managed to figure it out =)

        String input,encrypted, usrInput; 
        String origAlpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789., !";
        Scanner keyboard = new Scanner (System.in); 
        System.out.println("'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789., !'" );
        System.out.println("Please enter the string above in a different order so we can create a one-to-one mapping for encryption");
        System.out.println("For example: '0123456789., !PQRSTUVWXYZABCDEFGHIJKLMNO' ");
        input = keyboard.nextLine();
        int tempEncrypt = 0;
        encrypted = "";
        Scanner keybrd = new Scanner (System.in);
        System.out.println("Please enter a sentence to be encrypted:");
        usrInput=keybrd.nextLine();
        for (int i=0; i <usrInput.length(); i++) {
           tempEncrypt = origAlpha.indexOf(usrInput.charAt(i));               
           encrypted =  encrypted + input.charAt(tempEncrypt);
           
       }
       System.out.println("The encrypted version of your string is: " +encrypted);
    }

[JosAH]

Glad to read that it works; see? two Strings are enough to get those Caesar encryptions/decryptions implemented. Those Maps would've worked too but they're overkill here ...

kind regards,

Jos