中奖率 控制！

Question

抽奖系统怎么控制他！1，2，....3等奖的中奖率!
  我的思路是！从数据库里随机取几等奖！然后生成一随机的数组!把他放进数组！让后在随机取！在数据库里控制好中奖率！ 
 有没谁做过抽奖的啊！ 提供下思路啊！

Answer 1

package doubleball;import java.util.Arrays;
import java.util.Random;public class DoubleBallDemo {
  public static void main(String[] args) {
    String[] balls = gen();
    System.out.println(Arrays.toString(balls)); 
  }
  /** 生成一个双色球彩票号码 */
  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];
    Random random = new Random();
    String[] balls = new String[6];
    int i=0;//代表生成的结果球的序号
    while(true){
      int index = random.nextInt(pool.length);
      if(used[index]){//如果使用了index
        continue;//继续下次循环
      }
      balls[i++]=pool[index];//取出一个球放到balls中
      used[index]=true;
      if(i==balls.length){
        break;
      }
    }
    Arrays.sort(balls);
    balls=Arrays.copyOf(balls, balls.length+1);
    balls[i++]=pool[random.nextInt(16)];
    return balls;
  }
}这个双色球的代码有点类似你所说的抽奖问题