生产者消费者问题

最新推荐文章于 2021-02-12 09:02:52 发布

原创最新推荐文章于 2021-02-12 09:02:52 发布 · 408 阅读

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CC 4.0 BY-SA版权

文章标签：

#class #产品 #thread #c #string

本文通过Java代码实现了一个简单的生产者消费者模式案例。该案例中包含多个生产者线程和消费者线程，它们共享一个仓库对象来模拟生产和消费过程。通过同步方法控制生产与消费的时机，确保仓库不会溢出也不会为空。

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public class Producer_Consumer {

/**
* @param args
*/
public static void main(String[] args) {
  // TODO Auto-generated method stub
  GoDown gd=new GoDown(20);
  Producer p=new Producer(10,gd);
  Producer p2=new Producer(30,gd);
  Producer p3=new Producer(30,gd);
  Producer p4=new Producer(40,gd);
  Producer p5=new Producer(50,gd);
  Customer c1=new Customer(10,gd);
  Customer c2=new Customer(50,gd);
  Customer c3=new Customer(60,gd);
  Customer c4=new Customer(10,gd);
  Customer c5=new Customer(10,gd);
  p.start();
  p2.start();
  p3.start();
  p4.start();
  p5.start();
  c1.start();
  c2.start();
  c3.start();
  c4.start();
  c5.start();
}

}

class GoDown{
public static final int MAX_NUM=100;
public int curr_num;
public GoDown(){}
public GoDown(int num){
  this.curr_num=num;
}

public synchronized void produce(int n){
  while((this.curr_num+n)>MAX_NUM)
  {
   System.out.println("仓库已经满了，不能再生产了！");
   try {
    wait();
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  curr_num+=n;
  System.out.println("已经生产了"+n+"个产品，库存为"+curr_num+"个产品。");
  notifyAll();
}

public synchronized void consume(int n){
  while(this.curr_num<n)
  {
   System.out.println("库存产品不够了！");
   try {
    wait();
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  curr_num-=n;
  System.out.println("已经消费了"+n+"个产品，库存为"+curr_num+"个产品。");
  notifyAll();
}
}

class Customer extends Thread{
private int num;
private GoDown godown;
public Customer(int num, GoDown godown) {
  super();
  this.num = num;
  this.godown = godown;
}
@Override
public void run() {
  // TODO Auto-generated method stub
  godown.consume(num);
}

}

class Producer extends Thread{
private int num;
private GoDown godown;
public Producer(int num, GoDown godown) {
  super();
  this.num = num;
  this.godown = godown;
}
@Override
public void run() {
  // TODO Auto-generated method stub
  godown.produce(num);
}

}