package com.cj.java1;
class Producer extends Thread{
    private Clerk clerk;
    public Producer(Clerk clerk){
        this.clerk = clerk;
    }

    @Override
    public void run() {
        System.out.println("開始生產");
        while (true){
            try {
                Thread.sleep(20);
            } 
 
catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.addProduct();
        }
    }
}
class Clerk{
    private int productCount = 0;
    public synchronized void addProduct() {
        if (productCount<20){
            productCount++;
            System.out.println(Thread.currentThread().getName() 
 
+ "開始生產第："+productCount+"個產品");
            notify();

        }else{
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    public synchronized void decProduct() {
        if (productCount>0){
            System.out.println(Thread.currentThread().getName() 
 
+ "開始消費第："+productCount+"個產品");
            productCount--;
            notify();
        }else{
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
class Customer extends Thread{
    private Clerk clerk;
    public Customer(Clerk clerk){
        this.clerk = clerk;
    }
    @Override
    public void run() {
        System.out.println("開始消費");
        while (true){
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.decProduct();
        }
    }
}

public class ProductTest {
    public static void main(String[] args) {
        Clerk clerk = new Clerk();

        Producer producer = new Producer(clerk);
        Customer customer = new Customer(clerk);
        producer.setName("生產者");
        customer.setName("消費者");
        producer.start();
        customer.start();
    }
}