多线程模拟例题

创建一个商品类, 商品有编号, 价格, 生产日期属性,商品的编号不能重复.创建一个仓库类, 用户储存商品, 仓库类中使用Map集合, 将商品的编号当作是key,仓库有存储和取出的方法,创建两个工人和两个消费者, 工人生产商品, 消费者消费商品, 永不停止如果消费者消费时没有商品了, 就打印一句话:"快点生产呀", 然后休息1秒钟

商品类

import java.util.Date;

public class Commodity {
   private int num;
   private int price;
   private Date date = new Date();
   public Commodity(int num, int price, Date date) {
       super();
       this.num = num;
       this.price = price;
       this.date = date;
   }
   public int getNum() {
       return num;
   }
   public void setNum(int num) {
       this.num = num;
   }
   public int getPrice() {
       return price;
   }
   public void setPrice(int price) {
       this.price = price;
   }
   public Date getDate() {
       return date;
   }
   public void setDate(Date date) {
       this.date = date;
   }
   @Override
   public String toString() {
       return " 商品[编号:" + num + ", 价格:" + price + ", 日期:" + date + "]";
   }


}

仓库类

import java.util.HashMap;

public class Warehouse {
   static HashMap<Integer, Commodity> map = new HashMap<>();

   public static synchronized void cun(Commodity c){
       map.put(c.getNum(), c);
   }
   public static synchronized Commodity qu(){
       for(Integer i : map.keySet()){
           return map.remove(i);
       }
       return null;
   }

}

员工

import java.util.Date;
import java.util.Random;

public class Gongren extends Thread {
   static int num =0;
   public void run() {
       Warehouse wa = new Warehouse();
       Random ra = new Random();
       Date date = new Date();
   synchronized (Class.class) {

   while(true){
           num++;
           Commodity co = new Commodity(num, ra.nextInt(21)+20, date);
           wa.cun(co);
           System.out.println(Thread.currentThread().getName()+"做了一个"+co);

       }

}
}
}

消费者

public class People extends Thread{
   public void run (){


       while(true){
           Commodity co = Warehouse.qu();
           if(co==null){
               System.out.println("快点生产吧");
               try {
                   Thread.sleep(1000);
               } catch (InterruptedException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }
           }else{
               System.out.println(this.getName()+"买了一个"+co);
           }
       }
   }
}

测试

public class Test5 {
   public static void main(String[] args) {
       Gongren g1 = new Gongren();
        Gongren g2 = new Gongren();
        g1.setName("员工甲");
        g2.setName("员工乙");
       People p1 = new People();
       People p2 = new People();
       p1.setName("消费者1");
       p2.setName("消费者2");
        g1.start();
        g2.start();
       p1.start();
       p2.start();

   }
}

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