需求分析:生产者生产产品,存放在仓库里,消费者从仓库里消费产品。
程序分析:
1、生产者仅仅在仓储未满时候生产,仓满则停止生产。
2、消费者仅仅在仓储有产品时候才能消费,仓空则等待。
3、当消费者发现仓储没产品可消费时候会通知生产者生产。
4、生产者在生产出可消费产品时候,应该通知等待的消费者去消费。
package duoxiancheng;
public class ProducersAndConsumers {
public static void main(String[] args) {
Storage storage = new Storage();
Thread consumer = new Thread(new Consumer(storage));
consumer.setName("消费者");
Thread producer = new Thread(new Producer(storage));
producer.setName("生产者");
consumer.start();
producer.start();
}
}
/**
* 消费者
*/
class Consumer implements Runnable {
private Storage storage;
public Consumer(Storage storage) {
this.storage = storage;
}
@Override
public void run() {
storage.pop();// 从仓库中取出商品
}
}
/**
* 生产者
*/
class Producer implements Runnable {
private Storage storage;
public Producer(Storage storage) {
this.storage = storage;
}
//手动输入商品
@Override
public void run() {
Product product = new Product("0001", "手机");
Product product2 = new Product("0002", "平板");
storage.push(product);
storage.push(product2);
}
}
/**
* 产品类
*/
class Product {
private String id;// 产品id
private String name;// 产品名称
public Product(String id, String name) {
this.id = id;
= name;
}
@Override
public String toString() {
return "(产品ID:" + id + " 产品名称:" + name + ")";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
= name;
}
}
/**
* 仓库
*/
class Storage {
// 仓库容量为10
private Product[] products = new Product[10];
private int top = 0;
// 生产者往仓库中放入产品,定义临界区域。同步方法机制
public synchronized void push(Product product) {
while (top == products.length) {
try {
wait();// 仓库已满,等待
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 把产品放入仓库
products[top++] = product;
System.out.println(Thread.currentThread().getName() + " 生产了产品" + product);
notifyAll();// 唤醒等待线程
}
// 消费者从仓库中取出产品
public synchronized Product pop() {
while (top == 0) {
try {
wait();// 仓库空,等待
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 从仓库中取产品
--top;
Product p = new Product(products[top].getId(), products[top].getName());
products[top] = null;
System.out.println(Thread.currentThread().getName() + " 消费了产品" + p);
notifyAll();// 唤醒等待线程
return p;
}
}