java - int 是线程安全的吗?

Question

例如在springmvc的controller中

    public class EnchashmentController extends BaseController {
            private int a = 0;
            
            @requestMapping("")
            public ModelAndView add(){
                a++;
                return null;
            }
    }

每一个请求都在这里都执行一次a加一操作,1万次请求(并发)甚至更多次以后,这里输出的a是否就是 10000 或者 100000呢?

Answer 1

It should be said that a++ is not thread-safe

Answer 2

AtomicInteger should be the answer you want

Answer 3

Not safe. . . .