编程实现生产者、消费者和共享数据区域，并编写测试代码验证。给出java代码

以下是一个简单的Java代码实现生产者、消费者和共享数据区域的例子，并包含测试代码：

import java.util.LinkedList;

public class ProducerConsumerExample {

    public static void main(String[] args) {
        SharedData sharedData = new SharedData();
        Thread producer = new Thread(new Producer(sharedData));
        Thread consumer = new Thread(new Consumer(sharedData));
        producer.start();
        consumer.start();
    }

    static class SharedData {
        private final LinkedList<Integer> buffer = new LinkedList<>();
        private final int MAX_SIZE = 10;

        public synchronized void produce(int i) {
            while (buffer.size() == MAX_SIZE) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            buffer.add(i);
            System.out.println("Produced: " + i);
            notify();
        }

        public synchronized int consume() {
            while (buffer.size() == 0) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            int i = buffer.remove();
            System.out.println("Consumed: " + i);
            notify();
            return i;
        }
    }

    static class Producer implements Runnable {
        private final SharedData sharedData;

        public Producer(SharedData sharedData) {
            this.sharedData = sharedData;
        }

        @Override
        public void run() {
            for (int i = 0; i < 20; i++) {
                sharedData.produce(i);
                try {
                    Thread.sleep((long) (Math.random() * 100));
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    static class Consumer implements Runnable {
        private final SharedData sharedData;

        public Consumer(SharedData sharedData) {
            this.sharedData = sharedData;
        }

        @Override
        public void run() {
            for (int i = 0; i < 20; i++) {
                sharedData.consume();
                try {
                    Thread.sleep((long) (Math.random() * 100));
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

测试代码：

@Test
public void testProducerConsumer() {
    ProducerConsumerExample.SharedData sharedData = new ProducerConsumerExample.SharedData();
    Thread producer = new Thread(new ProducerConsumerExample.Producer(sharedData));
    Thread consumer = new Thread(new ProducerConsumerExample.Consumer(sharedData));
    producer.start();
    consumer.start();
    try {
        producer.join();
        consumer.join();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}