java - java语言中的凯撒密码密文失败

Question

我用 Java 语言制作凯撒密码加密器，这是我的代码

private void encCaesar() {
    tempCipher = "abcdef";
    char[] chars = tempCipher.toCharArray();
    for (int z = 0; z < tempCipher.length(); z++) {
        char c = chars[z];
        if (c >= 32 && c <= 126) {
            int x = c - 32;
            x = (x + keyCaesar) % 96;
            if (x < 0)
                x += 96;
            chars[z] = (char) (x + 32);
        }
    }
    ciphertext = chars.toString();
    etCipher.setText(ciphertext);
}

我查不出有什么不对，但是密文是这样的405888，明文为“abcdef”，默认 key 为3，这是胡说八道

怎么了？

正确:

private void encCaesar() {
    tempCipher = "abcdef";
    char[] chars = tempCipher.toCharArray();
    for (int z = 0; z < tempCipher.length(); z++) {
        char c = chars[z];
        if (c >= 32 && c <= 126) {
            int x = c - 32;
            x = (x + keyCaesar) % 96;
            if (x < 0)
                x += 96;
            chars[z] = (char) (x + 32);
        }
    }
    ciphertext = new String(chars);
    etCipher.setText(ciphertext);
}

Answer 1

您应该使用 new String(chars) 而不是 chars.toString() 创建 ciphertext:

ciphertext = new String(chars);