新手问题，关于双色球求高手指教！

Question

如何将双色球随机取出来而不重复，在不使用集合的情况下。求教，学习！

Answer 1

貌似这个前几天我刚遇到代码如下:package test;import java.util.ArrayList;
import java.util.List;
import java.util.Random;public class DoubleBalls {
public static void main(String[] args) {
String[] balls=new String[]{"01","02","03","04","05","06","07","08","09","10","11","12","13","14","15","16","17","18","19",
"20","21","22","23","24","25","26","27","28",};
boolean[] used=new boolean[balls.length];
List<String> picked=new ArrayList<String>();
Random ra=new Random();
int n=7;//这里是要取的个数
while(true){
int a=ra.nextInt(balls.length);
if(used[a])
continue;
else{
picked.add(balls[a]);
used[a]=true;
}
if(picked.size()==n)
break;
}
System.out.println(picked);
}}

Answer 2

终于做出来了，谢谢各位！
public static String[] gen(){
    String[] pool = {"01","02","03","04","05","06","07",
        "08","09","10","11","12","13","14","15","16",
        "17","18","19","20","21","22","23","24","25",
        "26","27","28","29","30","31","32","33"};
    boolean[] used = new boolean[pool.length];//使用标记
    Random r = new Random();
    String[] balls = new String[6];//空白数组
    int i = 0;
    while(true){
      int index = r.nextInt(pool.length);//随机下标
      if(used[index])//检查下标是否使用过
        continue;//重新执行循环, 生成新的随机数
      balls[i++]=pool[index];//取出一个球到 balls 数组
      used[index]=true;//标识使用了
      if(i==balls.length)//检查是否都取满了
        break;
    }