这个适配器模式的加密算法（DoEncrypt）怎么设计对应的解密算法（DoDecrypt）？

Question

public final String DoEncrypt(int key, String ps) {
        String es = "";
        for (int i = 0; i < ps.length(); i++) {
            char c = ps.charAt(i);
            if (c >= 'a' && c <= 'z') {
                c += key % 26;
                if (c > 'z') {
                    c -= 26;
                }
                if (c < 'a') {
                    c += 26;
                }
            }
            if (c >= 'A' && c <= 'Z') {
                c += key % 26;
                if (c > 'Z') {
                    c -= 26;
                }
                if (c < 'A') {
                    c += 26;
                }
            }
            es += c;
        }
        System.out.println( ps + "==>" + es);
        return es;
    }

Answer 1

https://blog.csdn.net/weixin_30912051/article/details/94928402