多线程抽奖,加了个数组,怎么弄?有思路吗?

public class Test_01Demo extends Thread {
static int[] money = { 10, 5, 20, 50, 100, 200, 500, 800, 2, 80, 300, 700 };
static int index = 0;

@Override
public void run() {
    synchronized (Test_01.class) {
        while (true) {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            // 创建随机数对象
            Random r = new Random();
            index = r.nextInt(money.length);
            System.out.println(getName() + "又产生了一个" + money[index] + "元大奖");
        }
    }
}

}

// 测试类
public class Test_01 {
public static void main(String[] args) {
Test_01Demo t1 = new Test_01Demo();
t1.setName("抽奖箱1");
t1.start();
Test_01Demo t2 = new Test_01Demo();
t2.setName("抽奖箱2");
t2.start();

}

}

private int[] arr = {10,5,20,50,100,200,500,800,2,80,300};
private int num = arr.length;
private ArrayList<Integer> list =  new ArrayList<Integer>();