Java随机生成5位验证码，顺序，字母大小随机-创新互联

import java.util.Random;

public class test8 {

public static void main(String[] args){

//随机生成5位验证码

String str1 = "qwertyuiopasdfghjklzxcvbnm" + "QWERTYUIUOPASDFGHJKLZXCVBNM" ;

String str2 = "1234567890" ;

char[] arr1 = str1.toCharArray();

char[] arr2 = str2.toCharArray();

char[] arr = new char[5];

Random r = new Random();

for (int i = 0; i< 4; i++) {

int n = r.nextInt(arr1.length);

arr[i] = arr1[n];

}

int n2 = r.nextInt(arr2.length);

arr[arr.length-1] = arr2[n2];

//打乱顺序

int n = r.nextInt(5);

char temp = arr[n];

arr[n] = arr[arr.length-1];

arr[arr.length-1] = temp;

String str = new String(arr);

//输出结果

System.out.println(str);

}

}

运行结果：

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