随机生成6位的字符串验证码，要求包含数字、大小写字母

约定不等于承诺〃 2021-11-02 11:16 443阅读 0赞

老师讲的方法

package com.homework;
    
    public class Password {
        public static String getCode(int length){
            String code = "";
            for(int i=0;i<length;i++){
                boolean boo = (int)(Math.random()*2)==0;
                if(boo){
                    code += String.valueOf((int)(Math.random()*10));
                }else {
                    int temp = (int)(Math.random()*2)==0?65:97;
                    char ch = (char)(Math.random()*26+temp);
                    code += String.valueOf(ch);
                }
            }
            return code;
        }
    
        public static void main(String[] args) {
    
            System.out.println(Password.getCode(6));
            System.out.println("-----------------");
            System.out.println(Password.getVerify(6));
        }
    
        public static String getVerify(int length){
            String code = "";
            String str = "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASFGHJKLZXCVBNM";
            String[] strs = str.split("");
            for(int i = 0;i<length;i++){
                code += strs[(int)(Math.random()*strs.length)];
            }
            return code;
        }
    }

![1718617-20190729225002206-1759610876.png][]

网上找的方法

package cn.meiju;
    
    public class Password {
            public static void main(String[] args) {
                char[] arr = {48,49,50,51,52,53,54,55,56,57,//从0到9的数字 
                        65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,//从A到Z的数字 
                        97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122//从a到z的数字 
                }; 
                int i=1; 
                while(i++<=6){ 
                    //循环六次，得到六位数的验证码 
                char msg =arr[(int)(Math.random()*62)]; 
                System.out.print(msg); 
                } 
                
            }
    }

![1718617-20190729225115557-794068280.png][]

转载于:https://www.cnblogs.com/lev1/p/11267058.html

[1718617-20190729225002206-1759610876.png]: /images/20211101/be0f90fdb469475987f9a1e14e2435e0.png
[1718617-20190729225115557-794068280.png]: /images/20211101/fdcdf3abcc3047aa9eda16627250dd89.png