现有一个数组装了10个奖品在里面，使用3个线程同时去抽奖.最后打印出来.三个线程各自都抽到了什么奖品

public class TestDemo {
    public static void main(String[] args) {
        //1.现有一个数组装了10个奖品在里面.
        String[] box = {"电视机","电冰箱","电脑","游戏机","洗衣机","空调","手机","平板电脑","电动车","电饭煲"};
        //2.转换为List集合
        List list = new ArrayList<>(Arrays.asList(box));
        //3.创建三个线程, 并把"奖池"传入到线程中
        MyThread mt1 = new MyThread(list);
        MyThread mt2 = new MyThread(list);
        MyThread mt3 = new MyThread(list);
        mt1.setName("张三");
        mt2.setName("李四");
        mt3.setName("王五");
        //4.启动三个线程.
        mt1.start();
        mt2.start();
        mt3.start();
    }
}
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public class MyThread extends Thread {
    //定义List集合,用来存储所有的奖品
    private List list;

    public MyThread(List list) {
        this.list = list;
    }

    //定义List集合,存储自己抽到的奖品(因为是成员变量,所以每个MyThread对象,都有一个自己的集合)
    private List myList = new ArrayList<>();

    @Override
    public void run() {
        while (true) {
            synchronized (MyThread.class) {
                //获取集合中还有多少奖品
                int size = list.size();
                if (size > 0) {
                    //如果还有,就继续抽奖
                    int index = new Random().nextInt(size);
                    //删除的同时,可以把被删除元素返回,相当于拿出来了
                    String str = list.remove(index);
                    myList.add(str);
                } else {
                    //如果,没有就打印,并输出
                    System.out.println(getName() + ":" + myList);
                    break;
                }
            }
        }
    }
}