多生产者多消费者问题 - 黑马程序员技术交流社区

class Resource
{
private String name;
private int count = 1;
private boolean flag = false;
public synchronized void set(String name)
{
if(flag) {
try{this.wait();}catch(InterruptedException e){}
} else {//老师讲的是用while来判断防止生产一个消费多个的问题，我这样用if else 来判断是不是也可以也不会出现安全问题
this.name = name + count;
count++;
System.out.println(Thread.currentThread().getName()+"...生产者..."+this.name);
flag = true;
notifyAll();
}
}
public synchronized void out()// t3
{
if(!flag) {
try{this.wait();}catch(InterruptedException e){}
}else {
System.out.println(Thread.currentThread().getName()+"...消费者........"+this.name);
flag = false;
notifyAll();
}
}
}
class Producer implements Runnable
{
private Resource r;
Producer(Resource r)
{
this.r = r;
}
public void run()
{
while(true)
{
r.set("烤鸭");
}
}
}
class Consumer implements Runnable
{
private Resource r;
Consumer(Resource r)
{
this.r = r;
}
public void run()
{
while(true)
{
r.out();
}
}
}
class ProducerConsumerDemo
{
public static void main(String[] args)
{
Resource r = new Resource();
Producer pro = new Producer(r);
Consumer con = new Consumer(r);
Thread t0 = new Thread(pro);
Thread t1 = new Thread(pro);
Thread t2 = new Thread(con);
Thread t3 = new Thread(con);
t0.start();
t1.start();
t2.start();
t3.start();
}
}

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