java 线程模拟生产者和消费者

生产者和消费者问题是操作系统里面的一个经典问题，用java线程可以来模拟实现。知识点参考：

http://blog.csdn.net/lazy_p/archive/2010/06/02/5642657.aspx

代码如下：

package test1;

public class ConsumerAndProducer {
	private int[] buffer = new int[10];
	private int index = -1;
	private String SIGNAL1 = "SIGNAL";//互斥信号量
	private String SIGNAL2 = "SIGNAL";//互斥信号量

	public static void main(String[] args) {
		ConsumerAndProducer cp = new ConsumerAndProducer();
		cp.new Producer().start();
		cp.new Consumer().start();
	}

	private class Producer extends Thread {
		private void product() {
			buffer[++index] = index;
			System.out.println("生产:" + index);
		}

		@Override
		public void run() {
			while (true) {
				synchronized (SIGNAL2) {
					if (index < 9)
						product();
					else {
						System.out.println("wait Producer");
						try {
							// sleep(1000);
							SIGNAL1.notify();
							SIGNAL2.wait();

						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}

	}

	private class Consumer extends Thread {
		private void consume() {
			--index;
			System.out.println("消费" + buffer[index + 1]);
		}

		@Override
		public void run() {
			while (true) {
				synchronized (SIGNAL1) {
					if (index >= 0) {
						consume();
					} else {

						System.out.println("wait consumer");
						try {
							// sleep(1000);
							SIGNAL2.notify();
							SIGNAL1.wait();

						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}
	}
}