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>一下午面了6个Java后端,全是菜鸡...
一下午面了6个Java后端,全是菜鸡...
2025-12-04 12:50:41
一下午面了6个Java后端,全是菜鸡...
Java后端真的不难面吧,我就不信有了这个题库,还不会!
一、基础原理与并发编程
1. HashMap在JDK1.8之后的优化有哪些?链表转红黑树的阈值为什么是8?
2. 谈谈ThreadLocal的实现原理及其可能引发的内存泄漏问题。
3. synchronized和ReentrantLock在锁实现上的本质区别是什么?
4. 线程池的核心参数如何配置?为什么需要自定义拒绝策略?
5. volatile关键字如何保证可见性?能否保证原子性?
6. JVM内存结构中哪些区域是线程共享的?哪些是线程私有的?
7. 举例说明什么是指令重排序,JMM如何保证有序性?
8. CAS机制的原理是什么?ABA问题如何解决?
二、框架原理与中间件
1. Spring如何解决循环依赖问题?三级缓存的具体作用是什么?
2. Spring事务失效的常见场景有哪些?底层原理是什么?
3. MyBatis中#{}和{}的区别是什么?哪些场景必须使用{}?
4. SpringBoot自动配置的原理是怎样的?如何自定义Starter?
5. Redis持久化机制RDB和AOF的优缺点对比?生产环境如何选择?
6. 如何用Redis实现分布式锁?哪些坑需要注意?
7. Kafka如何保证消息不丢失?如何解决重复消费问题?
三、系统设计与架构
1. 如何设计一个支撑秒杀场景的系统?核心思路是什么?
2. 微服务拆分的原则是什么?如何划分服务边界?
3. 分布式ID生成方案有哪些?Snowflake算法存在哪些问题?
4. 如何实现接口的幂等性?有哪些典型方案?
5. 分布式事务的实现方式有哪些?TCC和可靠消息最终一致性的适用场景?
6. 如何设计一个高性能的本地缓存?需要考虑哪些问题?
7. 数据库分库分表的策略有哪些?如何避免热点数据问题?
四、场景设计与故障排查
1. 如果线上服务CPU突然飙升到100%,你的排查思路是什么?
2. 接口响应缓慢,如何定位性能瓶颈?需要关注哪些指标?
3. 线上环境出现OutOfMemoryError,如何快速定位和解决?
4. 如何设计一个安全的API开放平台?需要考虑哪些因素?
5. MySQL主从同步延迟导致数据不一致,如何解决?
6. Redis缓存穿透、击穿、雪崩的区别及解决方案?
7. 如何设计一个分布式会话方案?有哪些实现方式?
8. 系统上线后发现内存泄漏,如何定位和修复?
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CONNECT:[ UseTime:0.000596s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000844s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000282s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000302s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.000451s ]
SELECT * FROM `set` [ RunTime:0.000209s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.000611s ]
SELECT * FROM `article` WHERE `id` = 457248 LIMIT 1 [ RunTime:0.000377s ]
UPDATE `article` SET `lasttime` = 1765126438 WHERE `id` = 457248 [ RunTime:0.008744s ]
SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000225s ]
SELECT * FROM `article` WHERE `id` < 457248 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000388s ]
SELECT * FROM `article` WHERE `id` > 457248 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000327s ]
SELECT * FROM `article` WHERE `id` < 457248 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002965s ]
SELECT * FROM `article` WHERE `id` < 457248 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000498s ]
SELECT * FROM `article` WHERE `id` < 457248 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000506s ]
0.127135s