Question

public static String alternate (String original){
return null;
}

/**
* create and return a new string, with
* either original's first letter at the end (e.g. "abcd" --> "bcda")
* or original's last letter in the beginning (e.g. "abcd" --> "dabc")
*
*/

Answer 1

public class Alternate {

    public static String alternate(String original) {
        return original.substring(1) + original.charAt(0);
    }

    /**
     * create and return a new string, with
     * either original's first letter at the end (e.g. "abcd" --> "bcda")
     * or original's last letter in the beginning (e.g. "abcd" --> "dabc")
     */

    public static void main(String[] args) {
        System.out.println(alternate("abcd"));
    }
}