Java后端开发面试资料资源-CSDN文库

java

开发语言

需积分: 5 71 浏览量 2022-04-14 23:53:33 上传评论收藏 27.1MB PDF 举报

资源推荐

资源详情

资源评论

一 java 基础

........................................................................................................................................

1.1java 的 8 种基本数据类型装箱拆箱

...............................................................................

1.1.1．8 种基本数据类型

.................................................................................................

1.1.2．装箱和拆箱

..........................................................................................................

1.1.3．String 转出 int 型，判断能不能转？如何转？

..............................................

1.1.4 short s1 = 1; s1 = s1 + 1;有什么错? short s1 = 1; s1 +=1;有什么错?

..............

1.1.5．Int 与 Integer 区别

...............................................................................................

1.1.6．字节字符区别

......................................................................................................

1.1.7 java 基本类型与引用类型的区别

.........................................................................

1.2 重写重载封装继承多态

....................................................................................................

1.3 Stack Queue

.......................................................................................................................

1.3.1 PriorityQueue

..........................................................................................................

1.7 Concurrent 包

....................................................................................................................

1.8 面向对象

.............................................................................................................................

1.9 String StringBuffer StringBuilder hashcode equal

.........................................................

String 中的 hashcode 以及 toString

.............................................................................

1.10 java 文件读取

..................................................................................................................

1.11 Java 反射

..........................................................................................................................

1.12 JDK NDK JRE JNI

..............................................................................................................

1.13 static 和 final 的区别

......................................................................................................

1.14 map，list，set 区别

........................................................................................................

1.16 Session 和 COOKIE

..........................................................................................................

1.19 IO NIO BIO AIO select epoll

........................................................................................

1.19.1 NIO 的原理

...........................................................................................................

1.20 ThreadLocal

......................................................................................................................

1.22 finalize finalization finally

...............................................................................................

1.23 public private default protected

....................................................................................

1.25 Object

...............................................................................................................................

1.26 equls 和 == 的区别

......................................................................................................

1.27 异常

..................................................................................................................................

1.28 序列化

..............................................................................................................................

1.30 comparable 接口和 comparator 接口

...........................................................................

1.33 接口和抽象类

.................................................................................................................

1.34 Socket

...............................................................................................................................

1.35 Runtime 类

......................................................................................................................

1.36 值传递与引用传递

.........................................................................................................

1.37 泛型？与 T 的区别

.......................................................................................................

1.38 枚举类型字节码层面理解 Enum

.................................................................................

1.39 java 注解类型

............................................................................................................

1.40 字节流字符流

...............................................................................................................

1.41 静态内部类匿名类

.......................................................................................................

1.41.2 匿名类

................................................................................................................

二．集合类 Set

................................................................................................................................

2.1 HashMap

............................................................................................................................

(1) hashMap 的原理

.......................................................................................................

（3） get

.........................................................................................................................

（4）HashMap 的 put 方法源码

..................................................................................

（5）HashMap 问题 jdk1.8 优化

................................................................................

7.Hashmap 中的 key 可以为任意对象或数据类型吗？

...........................................

2.2 CurrentHashMap

...............................................................................................................

0. JDK1.7 ConCurrentHashMap 原理

.........................................................................

1. JDK1.7 Get

....................................................................................................................

2. JDK1.7 PUT

................................................................................................................

3. JDK1.7 Remove

............................................................................................................

4.JDK1.7 & JDK1.8 size()

..................................................................................................

5.JDK 1.8

...........................................................................................................................

6.JDK1.8 put

...................................................................................................................

7. JDK1.8 get 方法

...........................................................................................................

8. rehash 过程

..................................................................................................................

2.3 . Hashtable

.........................................................................................................................

0.参数

...............................................................................................................................

1.put

..................................................................................................................................

2.get

..................................................................................................................................

3.Remove

........................................................................................................................

4.扩容

................................................................................................................................

2.4 hashtable 和 hashmap 的区别

.........................................................................................

2.5 HashMap 和 ConCurrentHashMap 区别

.....................................................................

2.6 ConcurrentHashMap 和 HashTable 区别

........................................................................

2.7 linkedHashMap

...............................................................................................................

2.8 Linkedhashmap 与 hashmap 的区别

.............................................................................

2.9 HashSet

...............................................................................................................................

2.10 hashmap 与 hashset 区别

..............................................................................................

2.11 Collections.sort 内部原理

..............................................................................................

2.12 hash 算法

.........................................................................................................................

2.13 迭代器 Iterator Enumeration

........................................................................................

2.14 LIST ArrayList，LinkedList 和 Vector 的区别和实现原理

.........................................

2.15 快速失败(fail-fast)和安全失败(fail-safe)

....................................................................

三锁 volatile synchronized Lock ReentrantLock AQS CAS

.......................................................

3.1 .volatile 和 synchronized

.................................................................................................

3.1.1 Volatile 与 synchronized 区别

............................................................................

3.1.2 Volatile

.....................................................................................................................

3.1.3 Synchronized 原理

.................................................................................................

3.2 CAS

...................................................................................................................................

3.3 可重入锁 ReentrantLock

................................................................................................

1.5.3 乐观锁和悲观锁阻塞锁，自旋锁，偏向锁，轻量锁，重量锁。公平锁非公

平锁

...................................................................................................................................

3.3 ReentrantLock 和 synchronized 区别

...........................................................................

1.5.3 重入锁、对象锁、类锁的关系

............................................................................

四 java 多线程；

.............................................................................................................................

4.1 ．如何创建线程？哪种好？

...........................................................................................

4.2．线程状态

..........................................................................................................................

4.3．一般线程和守护线程的区别

.........................................................................................

4.4．sleep wait yield notify notifyAll join

........................................................................

4.5 中断线程

.............................................................................................................................

4.6 多线程如何避免死锁

.......................................................................................................

4,7 多线程的好处以及问题

...................................................................................................

4.8 多线程共用一个数据变量注意什么？

...........................................................................

4.9 线程通信方式

....................................................................................................................

4.10 线程池

...........................................................................................................................

4.11.线程中抛出异常怎么办

..................................................................................................

五．Java 进阶 ssh/ssm 框架

...........................................................................................................

2.1Spring

...................................................................................................................................

2.1.0 什么是 Spring 以及优点

.....................................................................................

2.1.1 ApplicationContext 和 beanfactory 的区别

.....................................................

2.1.2 Spring Bean 生命周期

.........................................................................................

2.1.3 spring

中

bean

的作用域

.................................................................................

2.1.4 Spring IOC

........................................................................................................

2.1.5 Spring AOP

............................................................................................................

2.1.6 事务

.........................................................................................................................

2.1.7 Spring MVC

.......................................................................................................

2.1.8 Spring

中设计模式

............................................................................................

2.2 Servlet

.................................................................................................................................

2.2.1 Servlet 生命周期

..................................................................................................

2.2 Struts

..................................................................................................................................

2.2.1 Struts 工作流程

.....................................................................................................

2.2.2 Struts 工作原理

......................................................................................................

2.2.3 do Fliter

...................................................................................................................

2.2.4 拦截器与过滤器的区别

........................................................................................

2.2.5 Struts 中为什么不用考虑线程安全

......................................................................

2.2.6 Struts2 和 Struts1 区别

.......................................................................................

2.3 Hibernate

............................................................................................................................

2.4 Redis

...................................................................................................................................

2.5 Tomcat

................................................................................................................................

2.6 netty

....................................................................................................................................

2.7 Hadoop

...............................................................................................................................

2.8 Volley

..................................................................................................................................

六．Java 内存模型和垃圾回收

.................................................................................................

3.0 什么是 JMM 内存模型？（JMM 和内存区域划分不是一回事）

................................

3.0.1 JMM 中的 happens-before 原则

......................................................................

100

3.1 内存分区

.........................................................................................................................

101

3.2 GC 算法（YGC and FGC）

.............................................................................................

104

3.2.1 YGC

........................................................................................................................

105

3.2.2 FGC

......................................................................................................................

105

3.3 垃圾收集器 CMS

...........................................................................................................

105

3.4 java 类加载机制双亲委派

............................................................................................

106

3.4.1 java 类加载的过程

..............................................................................................

106

3.4.2 双亲委派机制

.....................................................................................................

108

3.4.3 破坏双亲委派模型

..............................................................................................

109

3.5 内存泄露

.........................................................................................................................

110

3.6 .内存泄露的案例分析 jvm 调优

....................................................................................

110

3.6.1 jvm 调优目的

........................................................................................................

110

3.6.2 案例分析

..............................................................................................................

110

3.7 jstat jmap jps jinfo jconsole

............................................................................................

113

3.7.1 jstat

........................................................................................................................

113

3.7.2 jmap

.......................................................................................................................

114

3.7 JVM 参数设置

.................................................................................................................

114

3.8 内存分配与回收策略

.....................................................................................................

116

3.9 面试问题

.........................................................................................................................

116

3.9.1 一般 Java 堆是如何实现的？

..............................................................................

116

3.9.2 对象在内存中的初始化过程

..............................................................................

117

3.9.3 对象的强、软、弱和虚引用

.............................................................................

117

3.9.4

如何减少

的次数

........................................................................................

117

3.9.5

新生代老年代永久代

..................................................................................

118

七． juc 包

.....................................................................................................................................

120

7.0 juc 概况

............................................................................................................................

120

7.1 Tools

.................................................................................................................................

120

7.1.1 CountDownLatch

..................................................................................................

120

7.1.2 CyclicBarrier

........................................................................................................

120

7.1.3 Semaphore

..........................................................................................................

121

7.1.4 Exchanger

...........................................................................................................

121

7.2 List Set

.............................................................................................................................

121

7.3 Map

..............................................................................................................................

121

7.4 Queue

.........................................................................................................................

121

7.4.1 ArrayBlockingQueue

..........................................................................................

121

7.4.2 LinkedBlockingQueue

.......................................................................................

122

7.4.3 LinkedBlockingQueue 和 ArrayBlockingQueue 迥异

.................................

122

7.5 线程池

.............................................................................................................................

123

1.线程池工作原理

.........................................................................................................

123

2.线程池分类

.................................................................................................................

123

3.线程池底层实现类 ThreadPoolExecutor 类

..........................................................

124

4.线程池状态

.................................................................................................................

124

四.设计模式

....................................................................................................................................

125

4.0 什么是设计模式

.............................................................................................................

125

4.1.常见的设计模式及其 JDK 中案例：

..............................................................................

125

4.1.1 适配器模式

..........................................................................................................

125

4.1.2 迭代器模式

..........................................................................................................

125

4.1.3 代理模式

...........................................................................................................

125

4.1.4 观察者模式

.......................................................................................................

126

4.1.5 装饰器模式

.......................................................................................................

127

4.1.6 工厂模式

...........................................................................................................

128

4.1.7 建造者模式

.......................................................................................................

128

4.1.8 命令模式

...........................................................................................................

129

4.1.9 责任链模式

..........................................................................................................

129

4.1.10 享元模式

.........................................................................................................

129

4.1.11 中介者模式

.....................................................................................................

130

4.1.12 备忘录模式

.....................................................................................................

130

4.1.13 组合模式

.........................................................................................................

130

4.1.14 模板方法模式

.................................................................................................

130

4.1.15 单例模式

.................................................................................................................

131

1.非线程安全懒汉模式

................................................................................................

131

2、线程安全懒汉模式

................................................................................................

131

3.饿汉模式

....................................................................................................................

131

4. 静态类内部加载

.......................................................................................................

132

5.双重锁校验模式

.........................................................................................................

132

7. 懒汉模式与饿汉模式区别

.......................................................................................

133

8. 双重校验锁方法与线程安全的懒汉模式区别

.......................................................

133

4.2 设计模式六大原则

........................................................................................................

133

4.3 java 动态代理

..............................................................................................................

134

算法

.................................................................................................................................................

138

海量数据

.........................................................................................................................................

142

七．数据结构与算法

.....................................................................................................................

143

7.1 排序

..................................................................................................................................

143

7.1.1 直接插入排序

......................................................................................................

143

7.1.2 希尔排序

..............................................................................................................

145

7.1.3 冒泡排序

..............................................................................................................

145

7.1.4 快速排序

..............................................................................................................

145

7.1.5 直接选择排序

......................................................................................................

148

7.1.6 堆排序

..................................................................................................................

149

7.1.7 归并排序

..............................................................................................................

150

7.1.8 基数排序

..............................................................................................................

153

7.2 树

......................................................................................................................................

153

7.2.1 二分查找树

...........................................................................................................

153

八.数据库

........................................................................................................................................

155

8.1 索引 B 树 B+树

...............................................................................................................

155

8.1.1 索引特点优缺点适用场合

..................................................................................

155

8.1.2 Mysql 索引原理 B+树：

......................................................................................

156

8.1.3 索引分类

..............................................................................................................

159

8.2 innoDB 与 MyISAM 引擎区别

........................................................................................

162

剩余262页未读，继续阅读

评论收藏

内容反馈

liangzi1122333

粉丝: 0
资源: 2

Java后端开发面试资料

Java 后端面试题附答案

JAVA后端详细面试资料

JAVA后端开发面试题

java后端面试问题

java后端开发面试题总结

【Java核心知识面试】-各大公司Java后端开发面试题总结.zip

各大公司Java后端开发面试题总结.pdf

各大公司Java后端开发面试题总结

Java后端开发面试常见问题

Java后端技术面试题汇总

Java后端研发面试题集.zip

各大公司Java后端开发面试题总结.doc

这是一个Java后端开发面试题

500道java后端面试必知必会

Java 后端开发面试题-附校招简历（秋招）

Java后端开发面试题2021，基于JavaGuide、Cyc大佬

java后端面试题答案.pdf

java 后端 工程师面试集锦答案

java后端面试题答案

sentinel-dashboard-1.8.0.jar

基于spring boot的小区物业管理系统源码+论文+答辩ppt

tomcat 8.5.100

最新Java JDK 8安装版（Windows 64位）

自主研发的软著申请代码文档整理输出工具

毕业设计-基于JAVA的springboot超市进销存系统(源代码+论文）

Java 面经手册·小傅哥.pdf

JAVA课程设计，学生管理系统，设计SQL server数据库操作

BurpLoaderKeygen.jar.zip

java-11 windows-x64 安装包

最新资源

java 后端工程师面试集锦答案