#生产者和消费者问题 ``` package 生产者消费者; public class ProducerConsumerTest { public static void main(String[] args) { PublicResource resource = new PublicResource(); new Thread(new ProducerThread(resource)).start(); new Thread(new ConsumerThread(resource)).start(); new Thread(new ProducerThread(resource)).start(); new Thread(new ConsumerThread(resource)).start(); new Thread(new ProducerThread(resource)).start(); new Thread(new ConsumerThread(resource)).start(); } } ``` ``` package 生产者消费者; /** * 生产者线程，负责生产公共资源 * @author dream * */ public class ProducerThread implements Runnable{ private PublicResource resource; public ProducerThread(PublicResource resource) { this.resource = resource; } @Override public void run() { while (true) { try { Thread.sleep((long) (Math.random() * 1000)); } catch (InterruptedException e) { e.printStackTrace(); } resource.increase(); } } } ``` ``` package 生产者消费者; /** * 消费者线程，负责消费公共资源 * @author dream * */ public class ConsumerThread implements Runnable{ private PublicResource resource; public ConsumerThread(PublicResource resource) { this.resource = resource; } @Override public void run() { while (true) { try { Thread.sleep((long) (Math.random() * 1000)); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } resource.decrease(); } } } ``` ``` package 生产者消费者; /** * 公共资源类 * @author dream * */ public class PublicResource { private int number = 0; private int size = 10; /** * 增加公共资源 */ public synchronized void increase() { while (number >= size) { try { wait(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } number++; System.out.println("生产了1个，总共有" + number); notifyAll(); } } /** * 减少公共资源 */ public synchronized void decrease() { while (number <= 0) { try { wait(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } number--; System.out.println("消费了1个，总共有" + number); notifyAll(); } } ```