采用字符的移位方式实现字符文本加密解密。

package hanqi;

import java.util.Scanner;

public class Test7 {

    public static void main(String[] args) {

        System.out.println("请输入一个字符串");
        Scanner sc =new Scanner(System.in);
        String str1 = new String();
        str1=sc.nextLine();        
        System.out.println(str1.replaceAll("a", "1.").replaceAll("b", "2.").replaceAll("c", "3.").replaceAll("d", "4.").replaceAll("e", "5.").replaceAll("f", "6.").replaceAll("g", "7.").replaceAll("h", "8.").replaceAll("i", "9.").replaceAll("j", "10.").replaceAll("k", "11.").replaceAll("l", "12.").replaceAll("m", "13.").replaceAll("n", "14.").replaceAll("o", "15.").replaceAll("p", "16.").replaceAll("q", "17.").replaceAll("r", "18.").replaceAll("s", "19.").replaceAll("t", "20.").replaceAll("u", "21.").replaceAll("v", "22.").replaceAll("w", "23.").replaceAll("x", "24.").replaceAll("y", "25.").replaceAll("z", "26."));

    }

}