生产者和消费者

生产者和消费者问题 Synchronized 版

public class Data {
    private int num=0;

    public synchronized void increat() throws InterruptedException {
        while (num!=0){
            this.wait();
        }
        num++;
        System.out.println(Thread.currentThread().getName()+num);
        this.notifyAll();
    }

    public synchronized void decreat() throws InterruptedException {
        while (num==0){
            this.wait();
        }
        num--;
        System.out.println(Thread.currentThread().getName()+num);
        this.notifyAll();
    }
}

public class Pc {
    public static void main(String[] args) {
        Data data=new Data();

        new Thread(()->{
            for (int i = 0; i < 20; i++) {
                try {
                    data.increat();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();

        new Thread(()->{
            for (int i = 0; i < 20; i++) {
                try {
                    data.decreat();
                } catch (InterruptedException e) {

                }
            }
        },"B").start();
    }


}

JUC版的生产者和消费者问题

public class Data {
    private int num = 0;
    Lock lock = new ReentrantLock();
    Condition condition1 = lock.newCondition(); 
    Condition condition2 = lock.newCondition();
    Condition condition3 = lock.newCondition();

    public void A() {
        lock.lock();
        try {
            while (num != 0) {
                condition1.await();
            }
            System.out.println(Thread.currentThread().getName() + num);
            num = 1;
            condition2.signal(); //指定唤醒
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void B() {
        lock.lock();

        try {
            while (num != 1) {
                condition2.await();
            }
            System.out.println(Thread.currentThread().getName() + num);
            num = 2;
            condition3.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void C() {
        lock.lock();

        try {
            while (num != 2) {
                condition3.await();
            }
            System.out.println(Thread.currentThread().getName() + num);
            num = 0;
            condition1.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

}

public class Pc {

    public static void main(String[] args) {
        Data data = new Data();
        new Thread(()->{for (int i = 0; i < 10; i++) data.A();},"A").start();
        new Thread(()->{for (int i = 0; i < 10; i++) data.B();},"B").start();
        new Thread(()->{for (int i = 0; i < 10; i++) data.C();},"C").start();
    }

}