生产者与消费者

 

import java.util.LinkedList;
import java.util.Queue;
import java.util.Random;

public class ProducerConsumerInJava {
	public static void main(String args[]) {
		System.out.println("在Java中如何使用wait和notify！！！");
		System.out.println("解决生产者消费者问题！！！");
		Queue<Integer> buffer = new LinkedList<>();
		int maxSize = 3;
		Thread consumer = new Consumer(buffer, maxSize, "消费者");
		Thread producer = new Producer(buffer, maxSize, "生产者");
		producer.start();
		consumer.start();
	}
}

class Producer extends Thread {
	private Queue<Integer> queue;
	private int maxSize;

	public Producer(Queue<Integer> queue, int maxSize, String name) {
		super(name);
		this.queue = queue;
		this.maxSize = maxSize;
	}

	@Override
	public void run() {
		while (true) {
			synchronized (queue) {
				while (queue.size() == maxSize) {
					try {
						System.out.println(
								"Queue已经满了,  Producer thread waiting for consumer to take something from queue");
						queue.wait();
					} catch (Exception ex) {
						ex.printStackTrace();
					}
				}
				Random random = new Random();
				int i = random.nextInt();
				System.out.println("Producing value : " + i);
				queue.add(i);
				queue.notifyAll();
			}
		}
	}
}

class Consumer extends Thread {
	private Queue<Integer> queue;
	private int maxSize;

	public Consumer(Queue<Integer> queue, int maxSize, String name) {
		super(name);
		this.queue = queue;
		this.maxSize = maxSize;
	}

	@Override
	public void run() {
		while (true) {
			synchronized (queue) {
				while (queue.isEmpty()) {
					System.out.println(
							"Queue 为空, Consumer thread is waiting  for producer thread to put something in queue");
					try {
						queue.wait();
					} catch (Exception ex) {
						ex.printStackTrace();
					}
				}
				System.out.println("Consuming value : " + queue.remove());
				queue.notifyAll();
			}
		}
	}
}