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>其实,Java后端面试听到这几句话基本没戏
其实,Java后端面试听到这几句话基本没戏
2025-12-12 10:01:25
其实,Java后端面试听到这几句话基本没戏
这个世界就是个巨大的草台班子,大家的代码水平半斤八两。那些拿offer和被pass的人之间,最大的鸿沟就是不会“说”技术。
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有时面试换一种技术表达,结果天差地别。今天就分享几个能救命的回答技巧👇
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1、请介绍一下你最熟悉的项目?
不要说:“就是一个管理系统,用了Spring Boot和MySQL。”
✔参考回答:“我最近主导了一个订单中台项目,核心是解决超卖和高并发问题。我通过Redis+Lua实现了库存的原子扣减,用RabbitMQ做订单异步拆解,将下单接口的P99响应时间从2秒优化到了200毫秒,并在大促期间保持了零超卖。”
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2、HashMap的扩容机制是怎样的?
不要说:“达到负载因子就扩容,大概是两倍吧。”
✔参考回答:“当元素数量超过容量*负载因子时触发。JDK1.8做了优化,扩容时会重新计算索引,但元素的位置要么在原下标,要么在原下标+旧容量的位置。这个过程通过高位运算快速判定,避免了重新哈希,并发扩容时通过给槽位加锁保证线程安全。”
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3、线上CPU突然100%怎么排查?
不要说:“重启一下,或者看看日志。”
✔参考回答:“我会立刻通过top -Hp定位问题线程,用jstack抓取线程栈,分析是否死锁或陷入死循环。同时用jstat观察GC状况,判断是否因Full GC导致。”
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4、你说你用了Redis,那缓存穿透怎么办?
不要说:“不知道,没遇到过。”
✔参考回答:“我们采用了多层防御。对于不存在的Key,会缓存一个空值并设置短过期时间。同时,在接入层用布隆过滤器预先判断Key是否存在。对于热门Key失效导致的击穿,我们使用了互斥锁,只让一个请求回源加载,其他请求等待。”
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5、如何保证分布式事务的数据一致性?
不要说:“用Spring的@Transactional。”
✔参考回答:“根据业务场景选择。对强一致性要求高的支付链路,我们用了Seata的AT模式。对于最终一致性的场景,比如扣库存后发积分,我们采用可靠消息最终一致性,通过本地事务表+消息队列+定时对账来保证。”
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最后再碎碎念两句
回答时多关联业务价值,比如不说“我用了线程池”,而说“我用线程池优化了批量处理任务,使得系统在流量高峰时能平滑处理,资源利用率提升了40%”。让对方知道你不是只会调API,更能解决实际问题。
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CONNECT:[ UseTime:0.000823s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001242s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002333s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000649s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001190s ]
SELECT * FROM `set` [ RunTime:0.002243s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001378s ]
SELECT * FROM `article` WHERE `id` = 458070 LIMIT 1 [ RunTime:0.024689s ]
UPDATE `article` SET `lasttime` = 1765639894 WHERE `id` = 458070 [ RunTime:0.002945s ]
SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000603s ]
SELECT * FROM `article` WHERE `id` < 458070 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000978s ]
SELECT * FROM `article` WHERE `id` > 458070 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002870s ]
SELECT * FROM `article` WHERE `id` < 458070 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001135s ]
SELECT * FROM `article` WHERE `id` < 458070 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001145s ]
SELECT * FROM `article` WHERE `id` < 458070 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003613s ]
0.220775s