关于Java的Atomic包用法求助

public class Learn13 {
    AtomicInteger count = new AtomicInteger(0);
     void m() {
        for(int i= 0; i< 10000; i++)
            count.getAndIncrement();
    }
    
    public static void main(String[] args) {
        final Learn12 learn = new Learn12();
        Runnable r = new Runnable() {

            @Override
            public void run() {
                learn.m();
            }
            
        };
        List<Thread> threads = new ArrayList<Thread>();
        for(int i= 0; i< 10; i++) {
            threads.add(new Thread(r, "thead" + i));
        }
        for(Thread thread : threads) {
            thread.start();
        }
        
        for(Thread thread : threads) {
            try {
                thread.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        
        System.out.println(learn.count);
    }
}