字符串移位

Question

Im working on a simple encryptor for class and what Im trying to do is take in a message from the user as a String, scramble it then save the scrambled messege. I can figure out most parts of this, except that I would like to scramble the String by bit-shifting all the chars by a user set value.

So say I have:

    String msg="hello my name is blah blah";
    int userKey=6;

So how would I bit-shift the String by the value of the int?

Answer 1

Assuming you're trying to shift every char individually, you can try this snippet.-

StringBuilder msg = new StringBuilder("hello my name is blah blah");
int userKey = 6;
for (int i = 0; i < msg.length(); i ++) {
    msg.setCharAt(i, (char) (msg.charAt(i) + userKey));
}