Get the first letter of a word and bring it to the end

Question

How can I get the first letter of a word and bring it to the end?

Answer 1

You are taking the ith letter each time, when you should take the first letter with index 0 each time. Change

firstLetter = word.charAt(i);

to

firstLetter = word.charAt(0);

Answer 2

Something like this?

word = "test";
newWord = word.substring(1) + word.substring(0, 1);

Answer 3

    for (int i = 0; i < word.length(); i++) {
        firstLetter = word.charAt(0);
        word = word.substring(1, word.length());
        System.out.println(firstLetter + word);

        word += firstLetter;
    }

Answer 4

A sightly different approach: leave the word as is, and iterate through the permutations based on substrings. After all: "omputerc" is just [omputer] + [c], which is [c][omputer] swapped; the next iteration is "mputerco" which is just [mputer] + [co], or [co][mputer] swapped, and so forth:

String head, tail;
for (int i = 0, last = word.length()-1; i<last; i++) {
  head = word.substring(0,i);
  tail = word.substring(i,last);
  System.out.println(tail + head);
}

We leave the word as is, grab the head and tail substrings, and print them in reverse order, producing exactly what you need.