分享一下毕老师的生产者与消费者问题 - 黑马程序员技术交流社区

/*
对于多个生产者和消费者
为什么要定义while判断标识
因为：被唤醒的线程再一次判断标识
【为什么要定义notfiyAll
因为需要唤醒对方的线程
因为只用notfiy，容易出现只唤醒本方线程的情况，导致程序中的所有线程都等待
*/
class Rerource
{
private String name;
private int count=1;
private boolean flag=false;
public synchronized void set(String name)
{
while(this.flag)
try{this.wait();}catch(Exception e){}
this.name=name+"---"+count++;
System.out.println(Thread.currentThread().getName()+".....生产者...."+this.name);
this.flag=true;
this.notifyAll();
}
public synchronized void get()
{
while(!this.flag)
try{this.wait();}catch(Exception e){}
System.out.println(Thread.currentThread().getName()+".....消费者..........."+this.name);
this.flag=false;
this.notifyAll();
}
}
class Product implements Runnable
{
Rerource re=new Rerource();
Product(Rerource re)
{
this.re=re;
}
public void run()
{
while(true)
{
re.set("+商品+");
}
}
}
class Consumer implements Runnable
{
Rerource re=new Rerource();
Consumer(Rerource re)
{
this.re=re;
}
public void run()
{
while(true)
{
re.get();
}
}
}
public class ProductConsumerDome {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Rerource r=new Rerource();
Product p=new Product(r);
Consumer c=new Consumer(r);
Thread t1=new Thread(p);
Thread t2=new Thread(p);
Thread t3=new Thread(c);
Thread t4=new Thread(c);
t1.start();
t2.start();
t3.start();
t4.start();
}
}

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