IPC之生产者消费者问题：Java实现

import java.util.concurrent.*;
import java.util.*;

public class ConsumerProducer 
{
    public static void main(String[] args)
    {
        ExecutorService executor = Executors.newCachedThreadPool();
        executor.execute(new Consumer());
        executor.execute(new Producer());
        executor.shutdown();
    }
    
    private static Semaphore mutex = new Semaphore(1);    
    private static Semaphore full = new Semaphore(0);
    private static Semaphore empty = new Semaphore(20);

    private static LinkedList<Integer> q = new LinkedList<Integer>();
    
    private static class Consumer implements Runnable 
    {
        public void run()
        {
            try 
            {
                while ( true )
                {
                    full.acquire();
                    mutex.acquire();
                    
                    System.out.println("consume " + q.remove() );
                    
                    mutex.release();
                    empty.release();
                    
                    Thread.sleep((int)(Math.random() * 1000));
                }
            } 

            catch( InterruptedException ex ) 
            {
                ex.printStackTrace(); 
            }
        }
    }
    
    private static class Producer implements Runnable 
    {
        public void run()
        {
            try 
            {
                while ( true )
                {
                    empty.acquire();
                    mutex.acquire();
                    
                    int data = (int)(Math.random() * 1000);
                    q.offer(data);
                    System.out.println("\t\t\t\tproduce " + data);
                    
                    mutex.release();
                    full.release();
                    
                    Thread.sleep((int)(Math.random() * 1000));
                }
                
            } 
            
            catch( InterruptedException ex )
            {
                ex.printStackTrace();
            }
        }
    }
}