比较volatile下count++和 AtomicInteger自增中原子操作问题_JAVA_编程开发_程序员俱乐部

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;

public class VolatileTest {
private  AtomicInteger count1 = new AtomicInteger(0);

private volatile int count = 0;

public /* synchronized */ void increase() {
count++;
}
public  void increase2() {
count1.addAndGet(1);
}
public static void main(String[] args) throws InterruptedException {
CountDownLatch end = new CountDownLatch(10);
CountDownLatch start =  new CountDownLatch(1);
ExecutorService es   = Executors.newFixedThreadPool(10);
VolatileTest v = new VolatileTest();
for(int i=0;i<10;i++) {
es.execute(()->{
try {
start.await();
for(int j=0;j<1000;j++) {
v.increase();
}
} catch (InterruptedException e) {
e.printStackTrace();
}finally {
end.countDown();
}

});
}
System.out.println("线程开启执行");
start.countDown();
end.await();
System.out.println("计算结果");
System.out.println(v.count);

}
   

}