java加密解密返回值应该为多少

Question

不会填写return返回值，不填写程序出错。

import java.util.Scanner;

public class Demo10 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        char secret = '8'; 
        System.out.println("请输入您想加密的内容：");
        String pass = scan.next();
        System.out.println("原字符串内容：" + pass);
        String encryptResult = encryptAndDencrypt(pass, secret);
        System.out.println("加密后的内容：" + encryptResult);
        String uncryptResult = encryptAndDencrypt(encryptResult, secret);
        System.out.println("解密后的内容：" + uncryptResult);
}
    private static String encryptAndDencrypt(String encryptResult, char secret) {
        return ;
    }

}

Answer 1

我输入这样的，提示我没有定义encryptAndDencrypt,定义了不会填写返回值