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</pre><pre name="code" class="java"><span style="font-family: Arial, Helvetica, sans-serif;">
</span>
<span style="font-family: Arial, Helvetica, sans-serif;">package com.martin.java1;</span>
/**
*
* 问题: 生产者(Productor)将产品交给店员(Clerk),而消费者(Customer)从店员处取走产品,
* 店员一次只能持有固定数量的产品(比如:20),如果生产者试图生产更多的产品,店员会叫生产者
* 停一下,如果店中有空位放产品了,再通知生产者继续生产;如果店中没有产品了,店员会告诉消费者等一下, 如果店中有产品了再通知消费者来取走产品。
* 这里可能出现两个问题: >生产者比消费者快时,消费者会漏掉一些数据没有取到。 >消费者比生产者快时,消费者会取相同的数据
*/
class Clerk {
int product = 0;
public synchronized void addProduct() {
if (product < 20) {
product++;
System.out.println(Thread.currentThread().getName() + "生产者,生产了第"
+ product + "个产品");
notifyAll();
} else {
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public synchronized void comsumeProduct() {
if (product > 0) {
System.out.println(Thread.currentThread().getName() + "消费者,消费了第"
+ product + "个产品");
product--;// 消费一个就能将productor唤醒
notifyAll();
} else {
try {
wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
class Productor implements Runnable {
Clerk clerk;
public Productor(Clerk clerk) {
this.clerk = clerk;
}
public void run() {
System.out.println("生产者生产产品");
while (true) {
try {
Thread.currentThread().sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
clerk.addProduct();
}
}
}
class Customer implements Runnable {
Clerk clerk;
public Customer(Clerk clerk) {
this.clerk = clerk;
}
public void run() {
System.out.println("消费者消费产品");
while (true) {
try {
Thread.currentThread().sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
clerk.comsumeProduct();
}
}
}
public class TestProductComsume {
public static void main(String[] args) {
Clerk clerk = new Clerk();
Productor p = new Productor(clerk);
Customer c = new Customer(clerk);
Thread t1 = new Thread(p);
Thread t2 = new Thread(c);
t1.setName("生产者1");
t2.setName("消费者1");
t1.start();
t2.start();
}
}