Java通过异或运算实现字符串解密

public class MyStringUtils {
//    public static String encryptString(String target,Integer factor){

//        byte[] bytes = target.getBytes();

//        for (int i = 0; i < bytes.length; i++) {

//            bytes[i] ^= factor;

//        }

//

//        return new String(bytes);

//    }

//

//    public static String decodeString(String target, Integer factor){

//        byte[] bytes = target.getBytes();

//        for (int i = 0; i < bytes.length; i++) {

//            bytes[i] ^= factor;

//        }

//

//        return new String(bytes);

//    }
public static String encryptString(String target,Integer factor){

char[] chars = target.toCharArray();

for (int i = 0; i < chars.length; i++) {

chars[i] ^= factor;

}
return new String(chars);

}
public static String decodeString(String target, Integer factor){

char[] chars = target.toCharArray();

for (int i = 0; i < chars.length; i++) {

chars[i] ^= factor;

}
return new String(chars);

}
public static void main(String[] args) {

String target = "你好啊";

int factor = 31;

String encryptString = encryptString(target, factor);

System.out.println("加密后的字符串为"+encryptString);

System.out.println("解密后的字符串为"+decodeString(encryptString, factor));

}

}

输出结果

加密后的字符串为====使奢啕
解密后的字符串为====你好啊

思考:

为什么我把字节数组那段给注释掉了

如果使用字节数组会出现什么问题