java多线程-生产者消费者

最新推荐文章于 2024-05-14 21:35:15 发布

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最新推荐文章于 2024-05-14 21:35:15 发布

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分类专栏： java多线程生产者消费者经典多线程例子

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本文通过Java多线程实现生产者消费者模型，介绍了一个具体的例子，包括仓库类、生产者类、消费者类以及测试用例。该模型使用同步方法来确保线程安全，并通过wait()和notifyAll()来协调生产者与消费者的运行。

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例子用java多线程模拟生产者消费者的例子，上代码，代码有注释说的清楚：

仓库

package day5;
/**
 * <p>Title: Warehouse.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Warehouse {
	private int MAXNUM = 100;
	private int currentCount;
	
	public Warehouse(int i) {
		this.currentCount = i;
	}

	/**
	 * 生产者
	 * @param neednum
	 */
	public synchronized void produce(int neednum){
		
		// 当当前的数量和生产的数量大于仓库容量时等待消费
		while (currentCount + neednum > MAXNUM) {
			try {
				System.out.println("要生产的产品" + neednum + "个产品，超过仓库最大值" + MAXNUM);

				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		currentCount += neednum;
		System.out.println("已经生产了" + neednum + "个产品，现仓储量为" + currentCount);

		notifyAll();
	}
	
	/**
	 * 消费者方法
	 * @param neednum
	 */
	public synchronized void consume(int neednum){
		
		// 当当前的消费的数量大于库存时等待生产
		while (currentCount < neednum) {
			try {
				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		currentCount -= neednum;
		System.out.println("已经消费了" + neednum + "个产品，现仓储量为" + currentCount);
		notifyAll();
	}
	
}

生产者

package day5;
/**
 * <p>Title: Productor.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Producer extends Thread {

	private Warehouse house;
	private int neednum;
	
	public Producer(Warehouse house, int neednum){
		this.neednum = neednum;
		this.house = house;
	}
	@Override
	public void run() {
		house.produce(neednum);
	}


}

消费者

package day5;
/**
 * <p>Title: Consumer.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Consumer extends Thread {
	
	private Warehouse house;
	private int neednum;
	
	public Consumer(Warehouse house, int neednum){
		this.neednum = neednum;
		this.house = house;
	}
	@Override
	public void run() {
		house.consume(neednum);
	}

}

测试用例

package day5;
/**
 * <p>Title: Test.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Test {
	
	public static void main(String[] args) {
		
		Warehouse hourse = new Warehouse(30); 
		while(true){
			Consumer c1 = new Consumer(hourse,50); 
		    Consumer c2 = new Consumer(hourse, 20); 
		    Consumer c3 = new Consumer(hourse, 30); 
		    Consumer c4 = new Consumer(hourse,50); 
		    Consumer c5 = new Consumer(hourse, 20); 
		    Consumer c6 = new Consumer(hourse, 30); 
  		    
		    Producer p1 = new Producer(hourse, 10); 
		    Producer p2 = new Producer(hourse, 10); 
		    Producer p3 = new Producer(hourse, 10); 
		    Producer p4 = new Producer(hourse, 10); 
		    Producer p5 = new Producer(hourse, 10); 
		    Producer p6 = new Producer(hourse, 10); 
		    Producer p7 = new Producer(hourse, 80); 
		    
		    c1.start(); 
		    c2.start(); 
		    c3.start(); 
		    c4.start(); 
		    c5.start(); 
		    c6.start(); 
		    
		    p1.start(); 
		    p2.start(); 
		    p3.start(); 
		    p4.start(); 
		    p5.start(); 
		    p6.start(); 
		    p7.start(); 
		}
	    
	}
}