1.14 volatile是否能够替代synchronized(

/**
 * This is description.
 * 对比c013volatile.Demo, synchronized既可以保证可见性, 也能保证原子性, 而volatile只能保证可见性.
 * @author Chris Lee
 * @date 2019/3/6 20:59
 */
public class Demo {
    /*volatile*/ int count = 0;

    private synchronized void fun() {
        for (int i = 0; i < 10000; i++) {
            count++;
        }

    }

    public static void main(String[] args) {
        /*
        代码块与c013volatile.Demo一样.
         */
        Demo demo = new Demo();
        ArrayList<Thread> threads = new ArrayList<>(5);

        for (int i = 0; i < 5; i++) {
            Thread thread = new Thread(demo::fun, "thread" + (i + 1));
            threads.add(thread);
        }

        threads.forEach((o) -> o.start());

        threads.forEach((o) -> {
            try {
                // join: 等待终止指定的线程.
                o.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });

        System.out.println("count: " + demo.count);
        /*
        结果:
            count: 50000
         */
    }
}

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资料:

1. 学习视频: https://www.bilibili.com/video/av11076511/?p=1
2. 参考代码: https://github.com/EduMoral/edu/tree/master/concurrent/src/yxxy
3. 我的代码: https://github.com/ChrisLeejing/learn_concurrency.git