/**
* 實現生成 雙色球彩票號碼 算法
*
* 實現方法 返回彩票號碼 如:[03, 06, 08, 12, 15, 23, 28]
*
* 1) 生成紅球號碼
* 數據 紅球 ："01" ~ "33"
* 使用標記： f, f, ...
* 紅球號 : { ^, ^, ^, ^, ^, ^}
* index = 0 生成號碼的個數
* 2) 生成藍色球號碼
*/
public class Demo10 {
public static void main(String[] args) {
String[] balls = gen();
System.out.println(Arrays.toString(balls));
}
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];
String[] balls = new String[6];
int index = 0;
Random r = new Random();
do{
int i = r.nextInt(pool.length);
if(used[i]){ continue; }
balls[index++] = pool[i];
used[i] = true;
}while(index!=balls.length);
Arrays.sort(balls);
//擴容，追加藍色球號碼
balls = Arrays.copyOf(balls, balls.length+1);
balls[balls.length-1] = pool[r.nextInt(16)];
return balls;
}
}