闲着没事，写了个生产者消费者模式玩玩，顺便熟悉下notify的用法。

package sync;

public class Test {

	public static void main(String[] args) {
		
		Test test = new Test();
		Producer producer = test.new Producer();
		producer.start();
		
		Consumer consumer = test.new Consumer();
		consumer.setName("consumer   0======");
		consumer.start();
		
		Consumer consumer1 = test.new Consumer();
		consumer1.setName("consumer  1======");
		consumer1.start();
		
		Consumer consumer2 = test.new Consumer();
		consumer2.setName("consumer  2======");
		consumer2.start();
	}

	/**
	 * @Desc 仓库   （这是个内部静态类）
	 * @author liuxingmi
	 * @QQ 63972012
	 */
	static class Factory {

		volatile int count = 0;
		boolean flag = true;
		private static Factory instance = new Factory();
		public static Factory getInstance(){
			if(instance == null){
				instance = new Factory();
			}
			return instance;
		}
		
		public synchronized void producer() {
			if (count >= 5) {	
				flag = false;
				this.notifyAll();
				try {
					this.wait();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}

			count++;
			System.out.println("producer count = " + count);
			try {
				Thread.sleep(500);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		public synchronized void consumer() {
			
			if (!flag) {
				System.out.println( Thread.currentThread().getName() + "start count = " + count + " times:" + System.currentTimeMillis());
				if (count <= 0) {
					try {
						flag = true;
						this.notify();
						this.wait();
						
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
				if(count > 0){//这个地方一定要判断，因为notify是随机唤醒线程，如果不判断在一个生产者，多个消费者情况下会出现负数的情况
					count--;
					System.out.println( Thread.currentThread().getName() + " count = " + count);
				}

				try {
					Thread.sleep(500);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}

	/**
	 * @Desc 生产者
	 * @author liuxingmi
	 * @QQ 63972012
	 */
	class Producer extends Thread {

		Factory factory = Factory.getInstance();

		@Override
		public void run() {

			while (true) {
				factory.producer();

			}
		}
	}

	/**
	 * @Desc 消费者
	 * @author liuxingmi
	 * @QQ 63972012
	 */
	class Consumer extends Thread {
		
		Factory factory = Factory.getInstance();

		@Override
		public void run() {

			while (true) {
				factory.consumer();

			}
		}
	}
}

多线程生产者消费者模式