字符串加解密

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNextLine()){
            String s1 = sc.nextLine();
            String s2 = sc.nextLine();
            encode(s1);
            decode(s2);
        }
    }
    // 解密
    public static void encode(String s){
        char[] cc = s.toCharArray();
        for(int i = 0; i < s.length(); ++i){
            if(cc[i] >= 'a' && cc[i] <= 'z'){
                int k = cc[i] - 'a';
                System.out.print((char)(('a' + (k + 1)%26) - 32));
            }else if(cc[i] >= 'A' && cc[i] <= 'Z'){
                int k = cc[i] - 'A';
                System.out.print((char)(('A' + (k + 1)%26)  + 32));
            }else{
                int k = cc[i] - '0';
                System.out.print((char)('0' + (k + 1)%10));
            }
        }
        System.out.println();
    }
    // 解密
    public static void decode(String s){
        char[] cc = s.toCharArray();
        for(int i = 0; i < s.length(); ++i){
            if(cc[i] >= 'a' && cc[i] <= 'z'){
                int k = cc[i] - 'a';
                System.out.print((char)(('a' + (k + 26 - 1)%26) - 32));
            }else if(cc[i] >= 'A' && cc[i] <= 'Z'){
                int k = cc[i] - 'A';
                System.out.print((char)(('A' + (k + 26 - 1)%26)  + 32));
            }else{
                int k = cc[i] - '0';
                System.out.print((char)('0' + (k + 10 - 1)%10));
            }
        }
        System.out.println();
    }
}