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synchronized实现

public class App {       private int num;    /**     * 生产     */    public void product() {           try {               // 生产耗时            Thread.sleep(1000);            synchronized (this) {                   while (num >= 100) {                       wait();                }                num++;                System.out.println("生产");                System.out.println("库存量:" + num);                notifyAll();            }        } catch (InterruptedException e) {               e.printStackTrace();        }    }    /**     * 消费     */    public void sell() {           try {               // 卖出耗时            Thread.sleep(500);            synchronized (this) {                   while (num <= 0) {                       wait();                }                num--;                System.out.println("卖出");                System.out.println("库存量:" + num);                notifyAll();            }        } catch (InterruptedException e) {               e.printStackTrace();        }    }    public static void main(String[] args) throws Exception {           App app = new App();        Runnable product = new Runnable() {               @Override            public void run() {                   while (true) {                       app.product();                }            }        };        Runnable sell = new Runnable() {               @Override            public void run() {                   while (true) {                       app.sell();                }            }        };        for (int i = 0; i < 5; i++) {               System.out.println("投产");            new Thread(product).start();        }        for (int i = 0; i < 10; i++) {               System.out.println("销售");            new Thread(sell).start();        }    }}

阻塞队列实现

import java.util.concurrent.ArrayBlockingQueue;import java.util.concurrent.BlockingQueue;import java.util.concurrent.atomic.AtomicInteger;public class App {       private BlockingQueue
   
     blockingQueue=new ArrayBlockingQueue<>(100);    private AtomicInteger atomicInteger=new AtomicInteger();    /**     * 生产     */    public void product() {           try {               // 生产耗时            Thread.sleep(1000);            blockingQueue.offer(atomicInteger.incrementAndGet());            System.out.println("工厂"+Thread.currentThread().getName()+"生产\n库存量:" + blockingQueue.size());        } catch (InterruptedException e) {               e.printStackTrace();        }    }    /**     * 消费     */    public void sell() {           try {               // 卖出耗时            Thread.sleep(500);            System.out.println("消费者"+Thread.currentThread().getName()+"购买"+blockingQueue.take()+"号商品\n库存量:" + blockingQueue.size());        } catch (InterruptedException e) {               e.printStackTrace();        }    }    public static void main(String[] args) throws Exception {           App app = new App();        Runnable product = new Runnable() {               @Override            public void run() {                   while (true) {                       app.product();                }            }        };        Runnable sell = new Runnable() {               @Override            public void run() {                   while (true) {                       app.sell();                }            }        };        for (int i = 0; i < 3; i++) {               System.out.println("投产");            new Thread(product).start();        }        for (int i = 0; i < 5; i++) {               System.out.println("销售");            new Thread(sell).start();        }    }}
   

ReentrantLock实现

import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.ReentrantLock;public class App {       private ReentrantLock lock = new ReentrantLock();    private final Condition notFull = lock.newCondition();    private final Condition notEmpty = lock.newCondition();    private int num = 0;    public void product() {           try {               Thread.sleep(1000);            lock.lock();            while (num > 100) {                   notFull.await();            }            num++;            System.out.println("工厂" + Thread.currentThread().getName() + "生产\n库存：" + num);            notEmpty.signalAll();        } catch (Exception e) {               e.printStackTrace();        } finally {               lock.unlock();        }    }    public void sell() {           try {               Thread.sleep(800);            lock.lock();            while (num <= 0) {                   notEmpty.await();            }            num--;            System.out.println("顾客" + Thread.currentThread().getName() + "购买\n库存：" + num);            notFull.signalAll();        } catch (Exception e) {               e.printStackTrace();        } finally {               lock.unlock();        }    }    public static void main(String[] args) {           App app = new App();        for (int i = 0; i < 10; i++) {               new Thread(new Runnable() {                   @Override                public void run() {                       while (true) {                           app.product();                    }                }            }).start();        }        for (int i = 0; i < 5; i++) {               new Thread(new Runnable() {                   @Override                public void run() {                       while (true) {                           app.sell();                    }                }            }).start();        }    }}

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