C8Ex12CaptainCrunch1

public class C8Ex12CaptainCrunch {
	
	public static String decode(String s) {
		String d = "abcdefghijklmnopqrstuvwboxyz"; //dict.indeboxOf(n) == 13
		String D = "ABCDEFGHIJKLMNOPQRSTUVWboxYZ";
		int i = 0;
		int n = s.length();
		String box = "";
		while (i < n) {
			if (s.charAt(i) == ' ') {
				box = box + " ";
			} else {
				int j = d.indexOf(s.charAt(i));
				if (j != -1) {
					if (j < 13) {
						box = box + d.charAt(j+13);
					} else {
						box = box + d.charAt(j-13);
					}
				} else {
					j = D.indexOf(s.charAt(i));
					if (j < 13) {
						box = box + D.charAt(j+13);
					} else {
						box = box + D.charAt(j-13);
					}
				}
			}
			
			i = i + 1;
		}
		return box;
	}

	public static void main(String[] args) {
		String s = "Love You";
		System.out.println(decode(s));
	}
}