总结:还是掌握方法的运用++++++
package com.c2; //随机数组合,随机号码产生器 //随机号码 import java.util.Random; public class rfe { private static Random random = new Random(); public static String getRandom(String[] a, int length, int alength) { StringBuffer x = new StringBuffer(); for (int i = 0; i < length; i++) { x.append(String.valueOf(a[random.nextInt(alength)])); } return x.toString(); } public static void main(String[] args) { String a[] = new String[] { "2", "4", "5", "3", "7", "8", "1", "6" };// 输入的是字符串,对于StringBuffer System.out.println(getRandom(a, 10, 5));// 这里的10为数组元素个数,5为随机产生的数个数 } } // 522745