生产者消费者问题（java）

最新推荐文章于 2022-11-16 09:09:33 发布

VICHOU_FA

最新推荐文章于 2022-11-16 09:09:33 发布

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分类专栏： java 多线程线程安全

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本文介绍了一个使用Java实现的生产者消费者模式案例。通过定义Product类来同步增加和减少产品的数量，Producer类负责生产产品，而Consumer类负责消费产品。三个线程分别代表一个生产者和两个消费者，在共享资源Product实例的情况下并发运行。

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package com.testcase;


public class TestThread {
	public static void main(String[] args) {
		Product product = new Product();
		Producer p1 = new Producer();
		p1.setProduct(product);
		
		Consumer c1 = new Consumer();
		c1.setProduct(product);
		Consumer c2 = new Consumer();
		c2.setProduct(product);
		
		Thread t1 = new Thread(p1);
		t1.setName("生产者1");
		t1.start();
		Thread t2 = new Thread(c1);
		t2.setName("消费者01");
		t2.start();
		Thread t3 = new Thread(c2);
		t3.setName("消费者02");
		t3.start();
	
	}
}


class Producer implements Runnable{
	private Product product;


	public Product getProduct() {
		return product;
	}


	public void setProduct(Product product) {
		this.product = product;
	}


	@Override
	public void run() {
		while (true) {
			try {
				product.increase();
				
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	
}


class Consumer implements Runnable{
	private Product product;


	public Product getProduct() {
		return product;
	}


	public void setProduct(Product product) {
		this.product = product;
	}


	@Override
	public void run() {
		while (true) {
			try {
				product.decrease();
				Thread.yield();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}


class Product {
	
	private int num = 0;


	public int getNum() {
		return num;
	}


	public void setNum(int num) {
		this.num = num;
	}
	
	public synchronized void increase() throws InterruptedException {
		if (num < 100) {
			Thread.sleep(200);
			this.num ++;
			System.out.println(Thread.currentThread().getName() + "生产第" + num + "个产品！");
			notifyAll();
		} else {
			wait();
		}
	}
	
	public synchronized void decrease() throws InterruptedException {
		if (num > 0) {
			Thread.sleep(500);
			System.out.println(Thread.currentThread().getName() + "消费第" + num + "个产品！");	
			this.num --;
			notifyAll();
		} else {
			wait();
		}
		
	}
}