本文共 728 字，大约阅读时间需要 2 分钟。

实现代码：

import java.util.Random;public class Demo {
   		static char[] chars = {
   '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h',	            'i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};	  	    public static String getStr(int i){
   	        StringBuffer string =  new StringBuffer();	        Random random = new Random();	        while(i-->0){
   	            //获取随机生成的下标	            int x = random.nextInt(chars.length);	            string.append(chars[x]);	        }	        return string.toString();	}	    public static void main(String[] args) throws Exception {
   	        int i=6;	        String string = getStr(i);	        System.out.println(string);	    }}

实现结果截图：

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