线程经典模式之---生产者和消费者

package thread;

import java.util.LinkedList;
import java.util.Queue;

public class Demo16{
	private static Queue<Integer> q=new LinkedList<Integer>();
	public static void main(String[] args) {
		int maxSize=2;
		new Producer(q,maxSize,"生产者1").start();
		new Producer(q,maxSize,"生产者2").start();
		new Consumer(q,maxSize,"消费者1").start();
		new Consumer(q,maxSize,"消费者2").start();
		new Consumer(q,maxSize,"消费者3").start();
	}
	static class Producer extends Thread{
		Queue<Integer> q;
		int maxSize;
		String name;
		public Producer(Queue<Integer> q,int maxSize,String name) {
			this.q=q;
			this.maxSize=maxSize;
			this.name=name;
		}
		public void run() {
			while(true) {
				System.out.println(name+ "等待获得队列的锁");
				synchronized(q) {
					System.out.println(name+ "获得队列的锁");
					if(q.size()>=maxSize) {
						System.out.println("生产已经满员，"+name+"线程请等待。。。");
						try {
							//如果生产已经满员了，则生产者进入等待的状态，等待消费者的唤醒(消费者消费之后，maxSize不是最大值了就唤醒所有的线程)
							q.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
					int num=(int)(int)(Math.random()*100);
					q.add(num);
					//唤醒所有的线程，等待CPU调度其一获取锁
						q.notifyAll();
					System.out.println(name+"生产一个商品==>"+num+"剩余的q-->"+q);
					try {
						Thread.sleep(1000L);
						System.out.println(name+ "释放队列的锁");
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}
	}
	static class Consumer extends Thread{
		Queue<Integer> q;
		int maxSize;
		String name;
		public Consumer(Queue<Integer> q,int maxSize,String name) {
			this.q=q;
			this.maxSize=maxSize;
			this.name=name;
		}
		public void run() {
			while(true) {
				System.out.println(name+ "等待获得队列的锁");
				synchronized(q) {
					System.out.println(name+ "获得队列的锁");
					if(q.size()==0) {
						System.out.println(name+"暂时没有商品，线程请等待。。。");
						try {
							//如果没有商品，则线程释放锁，进入等待状态，等待生产者的的唤醒
							q.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
					int num=q.poll();
					//唤醒所有的线程，等待CPU调度其一获取锁
					q.notifyAll();
					System.out.println(name+"消费一个商品==>"+num+"剩余的q-->"+q);
					try {
						Thread.sleep(500L);
						System.out.println(name+ "释放队列的锁");
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}
	}
}
                                             package thread;

import java.util.LinkedList;
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