- /**
- * 数据加密传输
- */
- import java.util.Scanner;
- public class secretPass {
- public static void main(String[] args) {
- Scanner input = new Scanner(System.in);
- int num = 0;
- while (true) {
- System.out.println("请输入四位正整数:");
- num = input.nextInt();
- if (num> 999 && num < 10000) {
- System.out.println("输入数据有效!");
- break;
- } else {
- System.out.println("输入数据无效, 请重新输入!");
- }
- }
- System.out.println("加密前的数据是:" + num);
- int[] arrs = new int[4];
- arrs[0] = num % 10; // 取个位
- arrs[1] = num / 10 % 10; // 取十位
- arrs[2] = num / 100 % 10; // 取百位
- arrs[3] = num / 1000; // 取千位
- // 不能使用 for-each 语句改变 arrs 数组的元素
- // for-each 只能用来遍历打印数组元素
- for (int n : arrs) {
- n = (n + 5) % 10;
- System.out.print(n+" ");
- }
- /*
- for (int i = 0; i < arrs.length; i++) {
- arrs[i] = (arrs[i] + 5) % 10;
- }
- */
- /*
- for (int i = 0; i < arrs.length; i++) {
- System.out.print(arrs[i] + " ");
- }
- */
- int tmp1 = arrs[0];
- int tmp2 = arrs[1];
- int tmp3 = arrs[2];
- int tmp4 = arrs[3];
- arrs[0] = tmp4;
- arrs[1] = tmp3;
- arrs[2] = tmp2;
- arrs[3] = tmp1;
- System.out.print("加密后的数据是:");
- for (int i : arrs) {
- System.out.print(i);
- }
- }
- }
输出结果是:
来源: https://www.2cto.com/kf/201809/778510.html