本帖最后由 lcjasas 于 2013-3-31 10:40 编辑
class ProducerConsumerDemo
{
public static void main(String[] args)
{
Resource r = new Resource();
Producer pro = new Producer(r);
Consumer con = new Consumer(r);
Thread t1 = new Thread(pro);
Thread t2 = new Thread(pro);
Thread t3 = new Thread(con);
Thread t4 = new Thread(con);
t1.start();
t2.start();
t3.start();
t4.start();
}
}
class Resource
{
private String name;
private int count = 1;
private boolean flag = false;
public synchronized void set(String name)
{
while(flag)
try
{
wait();
}
catch (Exception e)
{
}
this.name = name+"---"+count++;
System.out.println(Thread.currentThread().getName()+"...生产者..."+this.name);
flag = true;
this.notifyAll();//
}
public synchronized void out()
{
while(!flag)
try
{
wait();
}
catch (Exception e)
{
}
System.out.println(Thread.currentThread().getName()+"...消费者-------"+this.name);
flag = false;
this.notifyAll();//
}
}
class Producer implements Runnable
{
private Resource res;
Producer(Resource res)
{
this.res = res;
}
public void run()
{
while(true)
{
res.set("+++商品+++");
}
}
}
class Consumer implements Runnable
{
private Resource res;
Consumer(Resource res)
{
this.res = res;
}
public void run()
{
while(true)
{
res.out();
}
}
}
这是毕老师多线程视频中关于“生产消费”的代码,实现生产1件商品,就消费1件商品。
疑问:那怎么实现生产多件商品,消费多件商品呢?其中还会出现什么安全问题? |