多线程小例子

来源：互联网发布：c语言 char 编辑：程序博客网时间：2024/06/06 02:45

/*注意代码里面的while（flag）判断是否需要进行操作，如果是if会只进行判断一次，while则是每次线程唤醒之后还需要再进行一次判断。

synchronized不再使用，因为这样会使notify配套使用，而在这个类型之中需要两套监视器，分别控制着生产者和消费者。

在这种线程问题之中要注意死锁问题以及线程调用*/

import java.util.concurrent.locks.*;
import java.util.concurrent.locks.ReentrantLock;

class resource {
   private int t = 1;
   private boolean flag = false;
   private String name;
   Lock lock=new ReentrantLock();
   Condition a=lock.newCondition();
   Condition b=lock.newCondition();
   public void set(String name)
   {
       lock.lock();
       try
      {
          while(flag)
          try{a.await();}catch(InterruptedException e) {}
          this.name=t+"个"+name;
          t++;
       System.out.println(Thread.currentThread().getName()+"生产了"+"第"+this.name);
       flag=true;
       b.signal();
      }
       finally
       {
           lock.unlock();
       }
   }
   public void out()
   {    lock.lock();
           try
           {
               while(!flag)
                   try {b.await();}catch(InterruptedException e) {}
               System.out.println(Thread.currentThread().getName()+"消费了第"+"..."+this.name);
               flag=false;
               a.signal();
           }
           finally
           {
               lock.unlock();
           }

       }

   }

   class creater implements Runnable
   {   private int i=1;
       private resource r;
       creater(resource r)
       {
           this.r=r;
       }
       public void run() {
           while(i<=100)
           {

               r.set("鸡");
               i++;



           }
       }
   }

class customer implements Runnable
{   private int i=1;
   private resource r;
   customer(resource r)
   {
       this.r=r;
   }
   public void run() {
           while(i<=100)
           {

           r.out();
           i++;



           }
       }

   }

public class MoreWorkDemo {
   public static void main(String[] args) {
       resource r = new resource();
       creater c=new creater(r);
       customer b=new customer(r);
       Thread t0 = new Thread(c);
       Thread t1= new Thread(c);
       Thread t2 = new Thread(b);
       Thread t3 = new Thread(b);
       t0.start();
       t1.start();
       t2.start();
       t3.start();

   }

}

阅读全文

0 0