多线程经典——生产者消费者问题（未加锁版）

/* * 生产者，消费者 *  * */class Resrouce{    private String name;    private int count=1;    private boolean flag=false;    public synchronized void set(String name)    {  while(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;        notifyAll();    }    public synchronized void out()    {    while(!flag)        try{this.wait();}        catch(InterruptedException e)        {}        System.out.println(Thread.currentThread().getName()+"..消费者............."+this.name);        flag=false;        notifyAll();    }}class Producer implements Runnable{    private Resrouce r;    Producer(Resrouce r)    {        this.r=r;    }    public void run()    {        while(true)        {            r.set("烤鸭");        }    }}class Consumer implements Runnable{    private Resrouce r;    Consumer(Resrouce r)    {        this.r=r;    }    public void run()    {        while(true)        {            r.out();        }    }}public class Demo  {    public static void main(String[] args)     {               Resrouce r=new Resrouce();        Producer pro=new Producer(r);        Consumer con=new Consumer(r);        Thread t1=new Thread(pro);        Thread t2=new Thread(con);        Thread t3=new Thread(pro);        Thread t4=new Thread(con);        t1.start();        t2.start();        t3.start();        t4.start();    }}