8.volatile原子性

package demo1;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * Created by liudan on 2017/7/2.
 */
public class MyThread_volatile2  extends Thread{
    private static volatile  int count;
    /*AtomicInteger：使用步长一次性加10*/
    private static void addCount(){
        for (int i=0;i<1000;i++){
            count++;
        }
        System.err.println(count);
    }
    @Override
    public   void run() {
        addCount();
    }
    public static  void main(String[] args){
        MyThread_volatile2[] myThread_volatile2 = new MyThread_volatile2[10];
        for (int i=0;i<myThread_volatile2.length;i++){
            myThread_volatile2[i] = new MyThread_volatile2();
        }
        for (int i=0;i<10;i++){
            myThread_volatile2[i].start();
        }
    }
}
输出：
1000
2000
3000
4000
5309
6716
7716
5716
8716
9716