多线程操作--AtomicInteger

来源：互联网发布：企业号oa系统源码编辑：程序博客网时间：2024/05/16 17:52

主函数：

public static void main(String[] args) throws InterruptedException    {        final MultiThreadVolatile test = new MultiThreadVolatile();        ExecutorService executorService = Executors.newFixedThreadPool(150);        for (int i =0 ; i < 100000; i++){            executorService.execute(new Runnable() {                @Override                public void run() {                    test.increase();                }            });        }        executorService.shutdown();        executorService.awaitTermination(100*1000, TimeUnit.DAYS);        System.out.println(test.getCount());    }

能正确运行的代码，每次结果都是100000：

public class MultiThreadVolatile {    private AtomicInteger count  = new AtomicInteger(0);    public int getCount(){        return count.get();    }    public void increase(){        count.incrementAndGet();    }}

肯定出问题的代码A:

public class MultiThreadVolatile {    private Integer count  = 0;    public int getCount(){        return count;    }    public void increase(){        count++;    }}

可能出问题的代码B:

public class MultiThreadVolatile {    private volatile Integer count  = 0;    public int getCount(){        return count;    }    public void increase(){        count++;    }}

阅读全文

0 0