Java多线程: 生产者消费者问题(源码)

有人反映看不到源码，发现是CSDN的代码控件有问题。希望CSDN好好改进一下。

暂时先以文本方式发布出来，格式会变样。

import java.util.LinkedList; public class ProducerConsumer { /** * @param args */ public static void main(String[] args) { Queue queue = new Queue(); Producer producer1 = new Producer(queue, "producer1"); Producer producer2 = new Producer(queue, "producer2"); Consumer consumer1 = new Consumer(queue, "consumer1"); Consumer consumer2 = new Consumer(queue, "consumer2"); Consumer consumer3 = new Consumer(queue, "consumer3"); producer1.start(); producer2.start(); consumer1.start(); consumer2.start(); consumer3.start(); } } class Message { public static int sno = 0; public int id = 0; public String content = null; public Message(String content) { synchronized(Message.class) { this.id = ++sno; } this.content = content; } public String toString() { return "id = " + id + ", content = " + content; } } class Queue { private LinkedList queue = null; private int capacity = 0; public Queue(int capacity) { this.capacity = capacity; queue = new LinkedList(); } public Queue() { this(10); } public synchronized void put(Message product) { //wait until the consumer has consume a product while(queue.size() >= capacity) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } queue.addLast(product); // notify the Consumer that a message has been put in the queue notifyAll(); } public synchronized Message get() { while(queue.isEmpty()) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } Message product = (Message)queue.removeFirst(); // notify the Producer that a message has been removed notifyAll(); return product; } public synchronized boolean isEmpty() { return queue.isEmpty(); } } class Producer extends Thread { private Queue queue = null; public Producer(Queue queue, String name) { this.queue = queue; setName(name); } public void run() { for(int i = 0; i < 10; i++) { try { sleep(100); } catch (Exception e) { e.printStackTrace(); } queue.put(produce()); } } public Message produce() { Message product = new Message("Made by " + getName()); System.out.println(this.getName() + " -- Produce: " + product); return product; } } class Consumer extends Thread { private Queue queue = null; public Consumer(Queue queue, String name) { this.queue = queue; this.setName(name); } public void run() { while(true) { try { sleep(100); } catch (Exception e) { e.printStackTrace(); } //when get a terminated message, stop the thread. if(!consume(queue.get())) { break; } } } public boolean consume(Message product) { System.out.println(this.getName() + " -- Consume: " + product); //terminated message. if(product == null || product.id == 20) { queue.put(null); return false; } return true; } }

import java.util.LinkedList;

public class ProducerConsumer
{

/**
* @param args
*/
public static void main(String[] args)
{
Queue queue = new Queue();

Producer producer1 = new Producer(queue, "producer1");
Producer producer2 = new Producer(queue, "producer2");

Consumer consumer1 = new Consumer(queue, "consumer1");
Consumer consumer2 = new Consumer(queue, "consumer2");
Consumer consumer3 = new Consumer(queue, "consumer3");

producer1.start();
producer2.start();
consumer1.start();
consumer2.start();
consumer3.start();
}
}

class Message
{
public static int sno = 0;

public int id = 0;

public String content = null;

public Message(String content)
{
synchronized(Message.class)
{
this.id = ++sno;
}
this.content = content;
}
public String toString()
{
return "id = " + id + ", content = " + content;
}
}

class Queue
{
private LinkedList queue = null;
private int capacity = 0;

public Queue(int capacity)
{
this.capacity = capacity;
queue = new LinkedList();
}
public Queue()
{
this(10);
}

public synchronized void put(Message product)
{
//wait until the consumer has consume a product
while(queue.size() >= capacity)
{
try
{
wait();
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}

queue.addLast(product);
// notify the Consumer that a message has been put in the queue
notifyAll();
}

public synchronized Message get()
{
while(queue.isEmpty())
{
try
{
wait();
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}

Message product = (Message)queue.removeFirst();
// notify the Producer that a message has been removed
notifyAll();

return product;
}

public synchronized boolean isEmpty()
{
return queue.isEmpty();
}
}
class Producer extends Thread
{
private Queue queue = null;
public Producer(Queue queue, String name)
{
this.queue = queue;
setName(name);
}
public void run()
{
for(int i = 0; i < 10; i++)
{
try
{
sleep(100);
}
catch (Exception e)
{
e.printStackTrace();
}

queue.put(produce());
}
}
public Message produce()
{
Message product = new Message("Made by " + getName());
System.out.println(this.getName() + " -- Produce: " + product);

return product;
}
}

class Consumer extends Thread
{
private Queue queue = null;

public Consumer(Queue queue, String name)
{
this.queue = queue;
this.setName(name);
}

public void run()
{
while(true)
{
try
{
sleep(100);
}
catch (Exception e)
{
e.printStackTrace();
}

//when get a terminated message, stop the thread.
if(!consume(queue.get()))
{
break;
}
}
}

public boolean consume(Message product)
{
System.out.println(this.getName() + " -- Consume: " + product);

//terminated message.
if(product == null || product.id == 20)
{
queue.put(null);
return false;
}

return true;
}
}