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>突然发现会面试的Java前同事真的好会说啊..
突然发现会面试的Java前同事真的好会说啊..
2025-12-25 14:51:49
突然发现会面试的Java前同事真的好会说啊..
很厉害的java同事离职了,跳槽到了一家更好的公司,笔试面试都是一把过,同事人太好了,直接自己总结好的笔试题都给我发来了,大致看了下真的很有用,大四准备找工作或者是想年末跳槽的,可以直接照着背!
.
1、HashMap的扩容机制是啥?JDK1.8做了啥优化?
普通回答:到负载因子就扩容,大概两倍。1.8加了红黑树。
✅高分回答:触发扩容是看元素数量 > 容量 * 负载因子。核心优化有三点:一是数据结构,链表过长(>8)且数组够长(>=64)会转成红黑树,防止超长链表影响查询效率;树节点过少(<=6)时再转回链表。二是插入方式,1.7是头插法(多线程下可能死循环),1.8改成了尾插法。三是扩容算法,1.8通过高位运算(e.hash & oldCap) == 0来判断元素新位置,要么在原下标i,要么在i + oldCap,避免了1.7中全部重新计算哈希,效率更高。
.
2、Spring的@Transactional在哪些常见场景下会失效?
普通回答:异常不对、方法不是public可能会失效。
✅高分回答:失效本质是Spring AOP代理没生效。常见坑有:一是自调用,类里A方法没加注解,调了本类有注解的B方法,这叫“自调用”,事务不生效,因为调用没走代理对象。二是异常被吃了,默认只回滚RuntimeException和Error,如果你在方法里try-catch了异常却没抛出去,或者抛了Exception这种受检异常,都不会回滚。三是方法非public,@Transactional基于代理,对非public方法不好使。四是数据库引擎,比如MySQL用了MyISAM,它本身就不支持事务。
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3、线上服务CPU突然飙升到100%,你的排查思路是啥?
普通回答:重启一下,或者看看日志。
✅高分回答:这是标准操作题。第一步定位进程和线程:用top找到最耗CPU的Java进程PID,再用top -Hp
[PID]
找到这个进程里最耗CPU的线程ID(TID)。第二步看线程在干嘛:把TID转成16进制,然后用jstack
[PID]
打印所有线程栈,在输出里搜这个16进制ID,就能看到是这个线程的哪行代码、执行哪个方法最吃CPU。第三步结合分析:如果是GC线程疯狂跑,就用jstat -gcutil
[PID]
看是不是频繁Full GC;如果是业务线程,大概率是代码里有死循环或者计算太密集的逻辑。用Arthas的thread命令能更快定位热点方法。
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CONNECT:[ UseTime:0.000986s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001570s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000626s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000569s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001295s ]
SELECT * FROM `set` [ RunTime:0.000479s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001348s ]
SELECT * FROM `article` WHERE `id` = 458502 LIMIT 1 [ RunTime:0.000888s ]
UPDATE `article` SET `lasttime` = 1766731288 WHERE `id` = 458502 [ RunTime:0.008005s ]
SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000495s ]
SELECT * FROM `article` WHERE `id` < 458502 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001005s ]
SELECT * FROM `article` WHERE `id` > 458502 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001148s ]
SELECT * FROM `article` WHERE `id` < 458502 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001150s ]
SELECT * FROM `article` WHERE `id` < 458502 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001075s ]
SELECT * FROM `article` WHERE `id` < 458502 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004123s ]
0.187680s