volatile中i++的原子性问题

/**
 * @create on 17/3/27
 * @description
 */
public class Main {
    static volatile int i = 0;
    public static class PlusTask implements Runnable{
        @Override
        public void run(){
            for(int k=0; k<10000; k++)
                i++;
        }
    }

    public static void main(String[] args) throws InterruptedException{
        Thread[] threads = new Thread[10];
        for(int i=0;i<10;i++){
            threads[i] = new Thread(new PlusTask());
            threads[i].start();
        }

        for(int i=0;i<10;i++){
            threads[i].join();
        }

        System.out.println(i);
    }
}

请教各位大牛 为什么这里的输出总是小于10000? 已经调用了thread.join

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