【0730拓展作业】随机生成6位的字符串验证码

需求：随机生成6位的字符串验证码，要求包含数字、大小写字母

 1 package com.random;
 2 
 3 public class VerifyCode {
 4     public static String getCode(int length) {
 5         String code = "";
 6         for (int i = 0; i < length; i++) {
 7             boolean boo = (int) (Math.random() * 2) == 0;
 8             if (boo) {
 9                 code += String.valueOf((int) (Math.random() * 10));
10             } else {
11                 int temp = (int) (Math.random() * 2) == 0 ? 65 : 97;
12                 char ch = (char) (Math.random() * 26 + temp);
13                 code += String.valueOf(ch);
14             }
15         }
16         return code;
17     }
18 
19     public static void main(String[] args) {
20 
21         System.out.println(VerifyCode.getCode(6));
22         System.out.println("-----------------");
23         System.out.println(VerifyCode.getVerify(6));
24     }
25 
26     public static String getVerify(int length) {
27         String code = "";
28         String str = "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASFGHJKLZXCVBNM";
29         String[] strs = str.split("");
30         for (int i = 0; i < length; i++) {
31             code += strs[(int) (Math.random() * strs.length)];
32         }
33         return code;
34     }
35 }

 1 package com.random;
 2 
 3 
 4 import java.util.ArrayList;
 5 import java.util.Collections;
 6 import java.util.List;
 7 import java.util.Random;
 8 
 9 public class Main {
10       public static void main(String[] args) {
11             //创建一个ArrayList集合，存放生成的代码
12             List<Object> list = new ArrayList();
13             //for循环生成6位验证码
14             for(int i = 0;i<6;i++) {
15                 //if语句交替判断生成数字或者字母
16                 if(i%2==0) {
17                     int b = (int)(Math.random()*10);//生成0~9的数字
18                     list.add(b);
19                 }else {
20                     boolean flag = false;
21                     do {
22                         int a = (int)(Math.random()*58+65);//生成大小写字母的ASCII码
23                         //if排斥多余的中间其他字符
24                         if(!(a>=91&&a<=95)) {
25                             String s = (char)a+"";//数字转字母
26                             list.add(s);
27                             flag = true;
28                         }
29                     }while(!flag);
30                 }
31             }
32              Collections.shuffle(list);//shuffle随机排序
33              String out = new String();
34              for(Object s : list) {
35                  out+=s;
36              }
37              System.out.println(out.toString());
38         }
39      
40 }