IBM Minus One

http://acm.hdu.edu.cn/game/entry/problem/show.php?chapterid=1&sectionid=2&problemid=21

这道题交了几次终于过了。。明明结果是对的。。。。

//author:pz

import java.io.IOException;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        for (int i = 1; i <= n; i++) {
            String s = in.next();
            System.out.println("String #" + i);
            System.out.println(change(s));
            System.out.println();
        }
    }

    private static char[] change(String s) {
        char[] a = new char[s.length()];
        for (int i = 0; i < s.length(); i++) {
            a[i] = (char) (s.charAt(i) + 1);
            if (a[i] == 'Z' + 1)
                a[i] = 'A';
            if (a[i] == 'z' + 1)
                a[i] = 'a';
        }
        return a;
    }
}