Java生成随机数代码演示，java随机数演示,import java.

Java生成随机数代码演示，java随机数演示,import java.

import java.util.Random;public class RandomCode {    public String getrandomCode(){        Random random = new Random();        StringBuffer randomCode = new StringBuffer();        int countCode = 4;        char[] codeSequence = { '0', '1', '2', '3', '4', '5', '6', '7', '8',        '9' };        for(int i=0;i<countCode;i++){            String strRand = String.valueOf(                    codeSequence[random.nextInt(codeSequence.length)]);            randomCode.append(strRand);        }        return randomCode.toString();    }    public static void main(String[] args) {        RandomCode rd = new RandomCode();        String str = rd.getrandomCode();        System.out.println(str);    }}