java.util.concurrent.atomic.Atom

AtomicInteger （保证多线程情况下的原子操作）

public class AtomicIntegerDemo {
    public static AtomicInteger count = new AtomicInteger(0);

    public static void inc(){
        try{
            Thread.sleep(1); //延迟1毫秒

        }catch (InterruptedException e){ //catch住中断异常，防止程序中断
            e.printStackTrace();

        }
        count.getAndIncrement();//count值自加1
    }


    public static void main(String[] args) throws InterruptedException {
        
        final CountDownLatch latch = new CountDownLatch(100);
        for(int i=0;i<100;i++){
            new Thread(new Runnable() {
                @Override
                public void run() {
                    AtomicIntegerDemo.inc();
                    latch.countDown();
                }
            }).start();
        }
        latch.await();

        System.out.println("运行结果："+AtomicIntegerDemo.count);
    }
}

运行结果

运行结果：100

Process finished with exit code 0