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>一周背完java面试八股文(附答案)
一周背完java面试八股文(附答案)
2025-12-04 02:24:18
一周背完java面试八股文(附答案)
以下为一周背完Java八股文核爆指南:
死磕高频20题!7天保命法:
Day1-2:Java基础:HashMap扩容2倍防哈希碰撞+链表转红黑树阈值8(泊松分布解释)→ synchronized锁升级流程(无锁→偏向→轻量→重量)→ ArrayList扩容1.5倍与LinkedList场景对比。
Day3:JVM:背熟G1/ZGC区别(G1分Region回收/ZGC<1ms暂停)+ OOM排查三板斧(jps→jstack→jmap -heap)+ GC算法口诀(新生代复制/老年代标记整理)。
Day4:并发:线程池7参数核心公式(CPU密集型=N+1,IO密集型=2*N)+ volatile可见性/禁止重排序原理→ AQS底层双向链表锁竞争。
Day5:MySQL:B+树比B树优势(矮胖多叉+范围查询快)+ 事务ACID实现(undo log回滚/redo log持久化)+ 索引失效场景(LIKE左%/OR条件未覆盖索引)。
Day6:框架:Spring循环依赖三级缓存(提前暴露半成品Bean)+ Spring Boot自动配置原理(spring.factories加载)+ MyBatis一级缓存缺陷(SqlSession级别易脏读)。
Day7:补漏:TCP三次握手(SYN→SYN-ACK→ACK)→ Redis雪崩(随机过期时间)&穿透(布隆过滤器)→ Git回滚(reset --soft保代码/--hard彻底删)。
暴力技巧:
①牛客《Top20八股》早晚各1轮
②费曼法录音自测(卡壳题标记重刷)
③口诀救命:“一核两队三拒绝”(线程池配置)、“新生代复制老年代标记整理”(GC)。
真相:7天背不全所有!但死磕这20题=覆盖90%基础考点,犹豫1小时=少面2家公司!
#java学习
#java
#java面试
#后端开发
#面试技巧
#java八股文
#计算机专业
#软件开发
#面试
#程序员
#面经
#计算机
#编程
#算法
#java培训
#程序员的出路
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CONNECT:[ UseTime:0.000644s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001011s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001525s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000500s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.000963s ]
SELECT * FROM `set` [ RunTime:0.000430s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001029s ]
SELECT * FROM `article` WHERE `id` = 457404 LIMIT 1 [ RunTime:0.000989s ]
UPDATE `article` SET `lasttime` = 1765092636 WHERE `id` = 457404 [ RunTime:0.002229s ]
SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000461s ]
SELECT * FROM `article` WHERE `id` < 457404 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000732s ]
SELECT * FROM `article` WHERE `id` > 457404 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000694s ]
SELECT * FROM `article` WHERE `id` < 457404 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005737s ]
SELECT * FROM `article` WHERE `id` < 457404 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001909s ]
SELECT * FROM `article` WHERE `id` < 457404 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003252s ]
0.166286s