Learning simple java string decoding/decryption

Question

I want to write a program that decrypts an input string. It selects 0,2,4,6,8 etc. characters from each section of text input and displays it in reverse in the decryption output.

Input: bxoqb swi eymrawn yim
Output: my name is bob

Keep in mind that the program ignores the space symbol, and repeats the loop at the beginning of each word!

I couldn't find anything on the net that isn't based on a more complicated encryption/decryption systems. I'm starting with the simple stuff, first.

edit: Yes, my question is how do I learn how to do this? Or if someone could teach me a technique to decode strings like this?

It selects 0,2,4,6,8 etc. characters from each section of text input And how do you do that? It looks like you've added random characters between the message characters (in reverse). How did you choose those characters? — Elliott Frisch
– Elliott Frisch, Commented Nov 5, 2015 at 4:53
The letters in between were chosen at random, they are not important. — aheroafaked
– aheroafaked, Commented Nov 5, 2015 at 5:28
Is there some issue with the answers on your other question? It might help reveal more about what your aiming to learn. — Linus
– Linus, Commented Nov 5, 2015 at 7:25

ganesh r · Accepted Answer · 2015-11-05 05:01:31Z

0

pseudo code:

Split your string based of space and store it in list.
iterate your list, get each string(bxoqb) and now extract characters(bob) as you want and save it
Iterate same list in reverse order.

Hope it helps you to start.

answered Nov 5, 2015 at 5:01

ganesh r

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2 Comments

aheroafaked Over a year ago

How do I create a list?

ganesh r Over a year ago

you can refer below link for more information beginnersbook.com/2013/12/java-arraylist

Doc · Accepted Answer · 2015-11-05 07:56:42Z

0

The following code is the most straightforward way...

//code starts

    public static void main(String[] args) {
    String str = "bxoqb swi eymrawn yim";
    String ans = decryption(str);
    System.out.println(ans);
}

public static String decryption(String str) {
    String ans = "";
    String[] words = str.split(" ");
    for (String s : words) {
        for (int i = 0; i < s.length(); i += 2) {
            ans = s.charAt(i) + ans;
        }
        ans = " " + ans;
    }
    return ans.trim();
}

//code ends

Hope it helps.

answered Nov 5, 2015 at 7:56

Doc

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