package com.www.java3;

/**
 * 线程通信例子：使用两个线程交替打印1-100
 * 三个方法：
 * 1.wait()：一旦执行此方法，线程进入阻塞状态，并释放同步监视器
 * 2.notify()：一旦执行此方法，唤醒被wait阻塞的一个线程，如果有多个线程被wait，则唤醒优先级最高的那个
 * 3.notifyAll()：唤醒所有被wait阻塞的线程
 *
 * 说明：
 * 1.wait()、notify()、notifyAll()只能出现在同步代码块，同步方法中（lock不行）
 * 2.三个方法的调用者必须是同步代码块或者同步方法中的同步监视器
 * 3.三个方法定义在Object类中
 * @author www
 * @creat 2022-{MONTH}-{DAY}
 */
class Number implements Runnable{
    private int num = 1;
    @Override
    public void run() {
        while(true){
            synchronized (this) {
                notify();
                if(num <= 100){
                    try {
                        Thread.sleep(10);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName() + num);
                    num++;
                    try {
                        //使调用wait()方法的线程进入阻塞状态
                        wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }else break;
            }
        }
    }
}
public class CommunicationTest {
    public static void main(String[] args) {
        Number number = new Number();
        Thread t1 = new Thread(number);
        Thread t2 = new Thread(number);
        t1.setName("线程一");
        t2.setName("线程二");
        t1.start();
        t2.start();
    }
}

package com.www.java3;

/**
 *
 * @author www
 * @creat 2022-{MONTH}-{DAY}
 */
class Clerk{

    private int productCount = 0;
    public synchronized void produceProduct() {
        if(productCount < 20){
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            productCount++;
            System.out.println(Thread.currentThread().getName() + "开始生产第" + productCount + "个产品");
            notify();
        }else {
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

    public synchronized void consumeProduct() {
        if(productCount > 0){
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + "开始消费第" + productCount + "个产品");
            productCount--;
            notify();
        }else {
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
class Productor extends Thread{
    private Clerk clerk;
    public Productor(Clerk clerk){
        this.clerk = clerk;
    }

    @Override
    public void run() {
        System.out.println(getName() + "开始生产产品");
        while (true){
            clerk.produceProduct();
        }
    }
}
class Customer extends Thread{
    private Clerk clerk;
    public Customer(Clerk clerk){
        this.clerk = clerk;
    }

    @Override
    public void run() {
        System.out.println(getName() + "开始消费产品");
        while (true){
            clerk.consumeProduct();
        }
    }
}
public class ProductTest {
    public static void main(String[] args) {
        Clerk clerk = new Clerk();
        Productor p1 = new Productor(clerk);
        Customer c1 = new Customer(clerk);
        p1.setName("生产者1");
        c1.setName("消费者1");
        p1.start();
        c1.start();
    }
}