题解 | #HJ029 字符串加解密#

import java.util.Scanner;

/**
 * HJ29 字符串加解密
 */
public class HJ029 {

    public static void main(String[] args) {
        String originStr = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        String encryptStr = "BCDEFGHIJKLMNOPQRSTUVWXYZAbcdefghijklmnopqrstuvwxyza1234567890";
        boolean isEncrypt = true;
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String str = sc.nextLine();
            StringBuilder sb = new StringBuilder();
            if (isEncrypt) {
                for (int i = 0; i < str.length(); i++) {
                    char ch = str.charAt(i);
                    int index = originStr.indexOf("" + ch);
                    sb.append(encryptStr.charAt(index));
                }
                isEncrypt = false;
            } else {
                for (int i = 0; i < str.length(); i++) {
                    char ch = str.charAt(i);
                    int index = encryptStr.indexOf("" + ch);
                    sb.append(originStr.charAt(index));
                }
                isEncrypt = true;
            }
            System.out.println(sb.toString());
        }
        sc.close();
    }

}