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乔戈里 java面经
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2019-03-14
08:19:21
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项目篇很重要,基本面试的第一个环节都是扣你的项目。项目一定要准备1到2个亮点(难点)!!!项目一定要准备1到2个亮点(难点)!!!项目一定要准备1到2个亮点(难点)!!!有些人看到这里就会说,我这项目水的一批,一点亮点都没有,咋整,全完了呀,别慌,听我给你吹一波。一开始我第一次面试的时候(第一次就去面阿里,我也是胆贼大),阿里面试官上来就怼项目,问我这是啥,那是啥,我说了以后,他就问着玩意底层是咋实现的,我用的是一个开源的爬虫,然后我就说我只会用,底层没有看过,他估计很失望;然后他问我的项目亮点是啥,我当时一下愣住了,扯了一些有的没的,都是失败的惨痛的教训,大家参考参考就好,不一定就一定要照着我学,非要知耻而后勇,咋提前准备好也是不错的。经过这次惨痛的教训以后,我就开始有意识地去想一些项目的亮点,即使不是我遇到的问题,我强行把这些问题加到我的项目上面,当做我的项目亮点。
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目录
一
java
基础
...................................................................................................................................
17
1.1java
的
8
种基本数据类型 装箱 拆箱
........................................................................
17
1.1.1
.
8
种基本数据类型
..........................................................................................
17
1.1.2
.装箱和拆箱
......................................................................................................
18
1.1.3
.
String
转出
int
型,判断能不能转?如何转?
......................................
18
1.1.4 short s1 = 1; s1 = s1 + 1;
有什么错
? short s1 = 1; s1 +=1;
有什么
错
?
...................................................................................................................................
19
1.1.5
.
Int
与
Integer
区别
.......................................................................................
19
1.1.6
.字节字符区别
..................................................................................................
20
1.1.7 java
基本类型与引用类型的区别
...................................................................
20
1.2
重写重载封装继承多态
.................................................................................................
20
1.3 Stack Queue
...............................................................................................................
21
1.3.1 PriorityQueue
................................................................................................
21
1.7 Concurrent
包
.............................................................................................................
26
1.8
面向对象
.........................................................................................................................
27
1.9 String StringBuffer StringBuilder hashcode equal
....................................
27
String 中的 hashcode 以及 toString
...........................................................................
28
1.10 java
文件读取
...........................................................................................................
29
1.11 Java
反射
...................................................................................................................
30
1.12 JDK NDK JRE JNI
................................................................................................
31
1.13 static
和
final
的区别
..............................................................................................
31
1.14 map
,
list
,
set
区别
................................................................................................
33
1.16 Session
和
COOKIE
.................................................................................................
34
1.19 IO NIO BIO AIO select epoll
............................................................................
35
1.19.1 NIO
的原理
.....................................................................................................
36
1.20 ThreadLocal
.............................................................................................................
38
1.22 finalize finalization finally
..................................................................................
38
1.23 public private default protected
.....................................................................
39
1.25 Object
.........................................................................................................................
39
1.26 equls
和
==
的区别
.................................................................................................
40
1.27
异常
.............................................................................................................................
40
1.28
序列化
.........................................................................................................................
42
1.30 comparable
接口和
comparator
接口
...............................................................
44
1.33
接口和抽象类
.............................................................................................................
45
1.34 Socket
.........................................................................................................................
47
1.35 Runtime 类
....................................................................................................................
47
1.36
值传递与引用传递
.....................................................................................................
47
1.37
泛型 ?与
T
的区别
..................................................................................................
47
1.38 枚举类型字节码层面理解 Enum
...............................................................................
48
1.39 java
注解类型
..........................................................................................................
50
1.40
字节流 字符流
...........................................................................................................
50
1.41
静态内部类 匿名类
...................................................................................................
52
1.41.2 匿名类
...............................................................................................................
54
二.集合类
Set
..............................................................................................................................
56
2.1 HashMap
......................................................................................................................
56
(1) hashMap 的原理
.....................................................................................................
56
(3) get
.......................................................................................................................
58
(4)HashMap 的 put 方法源码
.................................................................................
58
(5)HashMap 问题 jdk1.8 优化
...............................................................................
59
7.Hashmap 中的 key 可以为任意对象或数据类型吗?
.........................................
60
2.2 CurrentHashMap
......................................................................................................
61
0. JDK1.7 ConCurrentHashMap 原理
.......................................................................
61
1. JDK1.7 Get
...........................................................................................................
62
2. JDK1.7 PUT
..............................................................................................................
64
3. JDK1.7 Remove
...................................................................................................
66
4.JDK1.7 & JDK1.8 size()
...................................................................................
67
5.JDK 1.8
....................................................................................................................
67
6.JDK1.8 put
..................................................................................................................
68
7. JDK1.8 get
方法
...................................................................................................
70
8. rehash
过程
.............................................................................................................
70
2.3 . Hashtable
..................................................................................................................
70
0.参数
..............................................................................................................................
70
1.put
................................................................................................................................
71
2.get
................................................................................................................................
71
3.Remove
.......................................................................................................................
72
4.
扩容
.............................................................................................................................
72
2.4 hashtable
和
hashmap
的区别
................................................................................
73
2.5 HashMap
和
ConCurrentHashMap
区别
..........................................................
73
2.6 ConcurrentHashMap
和
HashTable
区别
...........................................................
73
2.7 linkedHashMap
.......................................................................................................
74
2.8 Linkedhashmap
与
hashmap
的区别
..................................................................
74
2.9 HashSet
........................................................................................................................
75
2.10 hashmap
与
hashset
区别
......................................................................................
76
2.11 Collections.sort
内部原理
.....................................................................................
76
2.12 hash
算法
....................................................................................................................
77
2.13
迭代器
Iterator Enumeration
...........................................................................
78
2.14 LIST ArrayList
,
LinkedList
和
Vector
的区别和实现原理
........................
79
2.15 快速失败(fail-fast)和安全失败(fail-safe)
...................................................................
80
三 锁
volatile synchronized Lock ReentrantLock AQS CAS
....................................
81
3.1 .volatile
和
synchronized
.......................................................................................
81
3.1.1 Volatile
与
synchronized
区别
.................................................................
84
3.1.2 Volatile
..............................................................................................................
84
3.1.3 Synchronized
原理
........................................................................................
84
3.2 CAS
..............................................................................................................................
87
3.3 可重入锁
ReentrantLock
.........................................................................................
87
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
.................................................................................................................................
88
3.3 ReentrantLock
和
synchronized
区别
..............................................................
88
1.5.3
重入锁、对象锁、类锁的关系
........................................................................
89
四
java
多线程;
..........................................................................................................................
89
4.1
.如何创建线程?哪种好?
........................................................................................
90
4.2
.线程状态
......................................................................................................................
90
4.3
.一般线程和守护线程的区别
......................................................................................
91
4.4.sleep
wait yield notify notifyAll join
..........................................................
91
4.5
中断线程
.........................................................................................................................
92
4.6
多线程如何避免死锁
....................................................................................................
93
4,7
多线程的好处以及问题
................................................................................................
94
4.8
多线程共用一个数据变量注意什么?
........................................................................
94
4.9
线程通信方式
................................................................................................................
94
4.10 线程池
.........................................................................................................................
95
4.11.
线程中抛出异常怎么办
..............................................................................................
95
五.
Java
进阶
ssh/ssm
框架
.....................................................................................................
97
2.1Spring
.............................................................................................................................
97
2.1.0 什么是 Spring 以及优点
...................................................................................
97
2.1.1 ApplicationContext 和 beanfactory 的区别
...................................................
97
2.1.2 Spring Bean 生命周期
........................................................................................
98
2.1.3 spring 中 bean 的作用域
...............................................................................
98
2.1.4 Spring IOC
.......................................................................................................
99
2.1.5 Spring AOP
..........................................................................................................
99
剩余282页未读,继续阅读
资源评论
- sharksir2019-10-30和简易版相比很粗糙,感觉不像是详细版。
- 最后d轻语2019-08-01半半拉拉的,不过还不错
spxcmz
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