多线程--多生产多消费例子中疑点 - 黑马程序员技术交流社区

class Resource
{
private String name;
private int count=1;
private boolean flag=false;
//注释一
public synchronized void set(String name)//①t1拥有执行权 t2等待->②执行到notify()唤醒t2,t1判断标识后执行wait(),等待->③t2开始执行
{
if(flag)
try
{
this.wait();
}
catch (InterruptedException e)
{
}
this.name=name+count;
count++;
System.out.println(Thread.currentThread().getName()+"...生产者"+this.name);
flag=true;
this.notify();
}
public synchronized void out()//t3等待 t4等待
{
if(!flag)
try
{
this.wati();
}
catch (InterruptedException e)
{
}
System.out.println(Thread.currentThread().getName+"...消费者"+this.name);
flag=false;
this.notify();
}
}
class Producer implements Runnable
{
private Resource r;
producer(Resource r)
{
this.r=r;
}
public void run()
{
while(true)
{
r.set("面包");
}
}
}
class Consumer implements Runnable
{
private Resource r;
consumer(Resource r)
{
this.r=r;
}
public void run()
{
while(true)
{
r.out();
}
}
}
class ThreadDemo
{
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();
}
}

复制代码