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>其实大部分后端岗都有一个通病...
其实大部分后端岗都有一个通病...
2025-12-04 18:41:37
其实大部分后端岗都有一个通病...
现在来面试的Java开发基本都有一些通病,想要拿到offer,这些坑可得避开👇🏻
Java 基础不扎实
问题表现:对JVM内存模型、线程安全、反射/注解核心原理理解模糊,手写代码时容易卡壳(比如实现线程池、手写单例模式或HashMap)。
建议:
深入理解JVM运作机制(如垃圾回收算法、类加载机制、双亲委派模型)。
能解释清楚synchronized与Lock的底层差异、CompletableFuture异步编程原理。
框架停留在API层面
问题表现:会用Spring Boot/Spring Cloud写接口,但说不清Spring IoC容器初始化流程、AOP动态代理原理、MyBatis的SQL执行流程与缓存机制。
建议:
研究框架源码核心逻辑(如Spring Bean的生命周期、Spring Cloud微服务组件的通信原理)。
思考业务场景:比如高并发场景下如何优化Spring事务?分布式锁该如何选型?
项目描述缺乏技术深度
问题表现:只罗列“用了Spring Boot+MySQL”,但不说为什么用(如MySQL索引如何提升查询效率?)、遇到什么挑战(如接口响应时间从500ms优化到50ms的具体手段)。
建议:
突出性能优化(MySQL慢查询优化、JVM参数调优、Redis缓存策略)。
准备一个复杂问题的解决过程(如分布式事务如何保证数据一致性?)。
工程化与中间件能力薄弱
问题表现:对Java CI/CD、自动化测试(如JUnit/TestNG用例设计、覆盖率提升)、Redis/Zookeeper/Kafka核心原理与调优经验不足。
建议:
至少掌握一种高级中间件优化(如Kafka分区策略与消费端限流、Redis集群部署与数据持久化)。
了解现代构建工具链(如Maven/Gradle依赖管理、Docker+K8s部署Java应用的优势)。
现在大厂很少问纯八股文,更多是:
场景题:如何设计一个高可用的分布式订单系统?
编码实战:手写一个带过期时间的本地缓存工具类(考察并发+数据结构)。
架构思维:微服务与单体应用如何取舍?分库分表后如何解决分布式ID问题?
建议:把“会用”变成“懂为什么”,并能在业务场景中做出合理的技术决策。
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CONNECT:[ UseTime:0.001107s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001822s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000698s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000714s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001483s ]
SELECT * FROM `set` [ RunTime:0.000599s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001486s ]
SELECT * FROM `article` WHERE `id` = 457252 LIMIT 1 [ RunTime:0.000995s ]
UPDATE `article` SET `lasttime` = 1765115650 WHERE `id` = 457252 [ RunTime:0.008739s ]
SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000657s ]
SELECT * FROM `article` WHERE `id` < 457252 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001066s ]
SELECT * FROM `article` WHERE `id` > 457252 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001032s ]
SELECT * FROM `article` WHERE `id` < 457252 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001135s ]
SELECT * FROM `article` WHERE `id` < 457252 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001359s ]
SELECT * FROM `article` WHERE `id` < 457252 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003739s ]
0.198330s