小编dev*_*Yan的帖子

我不明白'a'的值是0，为什么'a'不是10，那段代码的运行过程是什么，有必要从Java Memory Model分析吗？这是我的测试代码

package com.study.concurrent.demo;

import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

//@SpringBootTest
@Slf4j
class DemoApplicationTests {

    int a = 0;
    int b = 0;
    @Test
    void contextLoads() {
        ExecutorService executorService = Executors.newFixedThreadPool(1);
//        final Semaphore semaphore = new Semaphore(3);
        for (int i = 0; i < 10; i++) {
            executorService.execute(() -> {
//                try {
//                    semaphore.acquire();
//                } catch (InterruptedException e) {
//                    e.printStackTrace();
//                }
                add();
                bdd();
//              log.info("a: {},concurrent_id: {}",a,Thread.currentThread().getName());
//                semaphore.release();
            }); …