public static void main(String[] args) {
        ArrayList<Integer> productList = new ArrayList<>();
        ExecutorService executorService = Executors.newFixedThreadPool(15);
        for (int i = 0; i < 5; i++) {
             executorService.submit(new Productor(productList, 8));
        }
        for (int i = 0; i < 10; i++) {
             executorService.submit(new Consumer(productList));
        }
    }

class Consumer implements Runnable {
    private List<Integer> mProductList;

    public Consumer(List<Integer> mProductList) {
        this.mProductList = mProductList;
    }

    @Override
    public void run() {
        while (true) {
            synchronized (mProductList) {
                try {
                    while (mProductList.isEmpty()) {
                        mProductList.wait();
                    }
                    int product = mProductList.remove(0);
                    System.out.println("consume product:" + product);
                    mProductList.notifyAll();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

class Productor implements Runnable {
    private List<Integer> mProductList;
    private int maxSize;

    public Productor(List<Integer> mProductList, int maxSize) {
        this.mProductList = mProductList;
        this.maxSize = maxSize;
    }

    @Override
    public void run() {
        while (true) {
            synchronized (mProductList) {
                try {
                    while (mProductList.size() == maxSize) {
                        mProductList.wait();
                    }
                    Random random = new Random();
                    int product = random.nextInt();
                    mProductList.add(product);
                    System.out.println("produce product:" + product);
                    mProductList.notifyAll();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}