Internet winter has already begun, the whole industry is there such a strange scene: on the one hand to speed up the upgrading of enterprise, increase the pressure of internal competition to improve efficiency; on the other hand crazy to recruit people, to the scarcity of talent remains a high It needs.
Surely we have personal experience, the requirements for promotion within the company becomes higher, fewer places, requiring external opportunities have gone up, and limit gains, rank and so on. Abroad, too: Facebook, Microsoft, Google executives leave from time to time the news.
On the current environment point of view, the difficulty of quit success is much higher than in previous years. A clear feeling: This year's interview, whether face or two faces, are the test of technical knowledge Java programmers.
These architectural finishing techniques Java developers hope to be friends reference and detours, the focus of this article is that you have no gain and growth, and the rest is not important, I hope readers can keep this in mind!
note! : The need for small series finishing basic Java + database + SSM message queue framework + Redis + + Spring Boot + Spring Cloud seven categories interview questions and answers, study notes, Xmind mind map Friends can click on the portal below to get free
My collection of questions and answers surface finishing: Java foundation, Jvm, Redis, Mysql, Zookeeper, Tomcat, Docker, Nginx, etc.
A, Java foundation
- Object-oriented features have what? [Base]
- int and Integer What is the difference? [base]
- How much Math.round (11.5) equal? Math.round (-11.5) equals how much? [Base]
- Programming problem: calculate the most efficient method 2 multiplied by 8 is equal to a few [base]?
- Array has no length () method? String has no length () method? 【basis】
- Whether the constructor (constructor) can be rewritten (override)? 【basis】
- Can inherit String class? [Base]
- When an object is passed as a parameter to a method, this method can change the properties of this object, and returns the result of changes in the value of this in the end is passed by reference or pass? [Base]
- The difference between String and StringBuffer? [Base]
- String, StringBuffer StringBuilder difference of. 【basis】
- The difference between overloading (Overload) and rewritable (Override) is. Overloaded method can be differentiated according to the type of return? 【basis】
- Describe JVM load the class file the principle mechanism? 【medium】
- interface method can achieve it? 【medium】
- Can I issue a call to a non-static method from within a static method? 【basis】
- GC is the What? Why should there be GC? [Base]
- What is the basic principle is that the garbage collector? The garbage collector can immediately reclaim memory? Is there any way the initiative to inform the virtual machine garbage collection? 【basis】
- A ".java" if the source file can contain multiple class (not an internal class)? What are the limits? 【basis】
- The final keyword in Java What usage? 【basis】
- Transcoding: how to GB2312 encoded string into ISO-8859-1 encoded string? 【basis】
- error and exception What is the difference? [base]
- try {} there is a return statement, then the code immediately after this finally try {} Lane will not be executed, when executed, the return before or after? [base]
- List, Set, Map whether inherited from the Collection interface? 【basis】
- Say ArrayList, Vector, LinkedList storage performance and characteristics? 【basis】
- The difference between HashMap and Hashtable? [Base]
- Arraylist and Vector difference? 【basis】
- List, Map, Set three interfaces, accessing elements, what are the differences? 【basis】
- sleep () and wait () What is the difference? [base]
- When a thread enters a synchronized method of an object, other threads can access this object other methods? [Base]
- There are several methods to achieve multi-threaded, are what? There are several synchronous implementation, are what? [Base]
- When a thread enters a synchronized method A object, other threads can access synchronized method B of this object? 【medium】
- Description of the similarities and differences between synchronized and java.util.concurrent.locks.Lock? 【medium】
- There are several writing multithreaded program implementation? 【medium】
- How to implement Java serialization, what is the point? 【medium】
Java exam and interview basis of learning Mind Mapping
Second, the database
- Step forth JDBC database operation. 【basis】
- When you use JDBC to operate the database, how to improve the performance of data read? How to improve the performance of update data? 【medium】
- During programming database connection pool What is the role? 【basis】
- ACID transactions What does it mean? 【basis】
- Talk dirty reads, phantom reads and non-repeatable read? 【medium】
- How JDBC transaction processing? 【medium】
- Obtaining a class object class what way? 【basis】
- Which have built-in objects JSP? What role are? 【basis】
- get and post requests difference? 【basis】
- JSP explain in four scopes. 【basis】
Database interview exam and learning Mind Mapping
Three, SSM framework
- There MyBatis in writing using the # and $ placeholder What is the difference? 【medium】
- Explain the role MyBatis namespace (namespace) of. 【medium】
- What is the IoC and DI? DI is how to achieve? 【medium】
- Explain what AOP (Aspect Oriented Programming)? 【basis】
- How do you understand the "cross-cutting concerns," the concept? 【medium】
- How do you understand the connection point (Joinpoint) AOP in the cut point (Pointcut), enhanced (Advice), introducing (Introduction), weaving (Weaving), section (Aspect) these concepts? 【basis】
- Spring's transaction management support What types? Which way you use in your project? 【medium】
- Spring MVC works is like? 【basis】
- What is XSS ***? 【difficult】
- SQL injection ***? 【difficult】
- What is CSRF ***? 【difficult】
SSM interview exam and learning Mind Mapping
Four, redis
- What are the benefits of using redis there? 【basis】
- What data structures Redis there? 【basis】
- If a large number of key needs to be set at the same time has expired, the general needs attention? 【medium】
- Why Redis need to put all the data into memory? 【medium】
- Redis provides what kinds of persistent way? 【medium】
- 如何选择合适的持久化方式？【中等】
- redis支持的java客户端你用过哪个？【基础】
- Redis集群的主从复制模型是怎样的？【困难】
- Redis集群之间是如何复制的？【中等】
- 怎么测试Redis的连通性？【基础】
面试题库及学习思维导图
五、消息队列
- 为什么要用消息队列?【中等】
- 使用消息队列有什么缺点【中等】
- 为什么选用RocketMQ；RocketMQ和ActiveMQ的区别【困难】
- RocketMQ是怎么保证系统高可用的？【困难】
- 消息中间件集群崩溃，如何保证百万生产数据不丢失？【中等】
消息队列面试题库及学习思维导图
六、spring boot
- Spring Boot 的核心配置文件有哪几个？它们的区别是什么？【中等】
- Spring Boot 的配置文件有哪几种格式？它们有什么区别？【中等】
- Spring Boot 的核心注解是哪个？它主要由哪几个注解组成的？【基础】
- 开启 Spring Boot 特性有哪几种方式？【基础】
- Spring Boot 需要独立的容器运行吗？【基础】
- 如何在 Spring Boot 启动的时候运行一些特定的代码？【中等】
- Spring Boot 有哪几种读取配置的方式？【中等】
- Spring Boot 如何定义多套不同环境配置？【中等】
- SpringBoot中的定时任务如何实现？【中等】
- 我们如何连接一个像 MYSQL 或者 orcale 一样的外部数据库？【中等】
Spring Boot面试题库及学习思维导图
七、spring cloud
- 什么是微服务【中等】
- 微服务之间是如何独立通讯的spring Cloud和 Dubbo有哪些区別?【困难】
- springcloud如何实现服务的注册和发现【中等】
- Ribbon和Feign的区别【中等】
- springcloud断路器的作用【中等】
- springcloud如何实现服务的注册和发现【中等】
- springcloud中的组件有那些？【中等】
Spring Cloud面试题库
八、其他
- cookie和session的区别【基础】
- 一次完整的http请求过程【中等】
- 讲一下长连接【困难】
- TCP如何保证可靠传输？【困难】
- The difference between URI and URL of [medium]
- The difference between http and https? 【medium】
- docker commonly used commands [medium]
- What is the Docker mirror? 【medium】
- What is the Docker containers? 【medium】
- What is the Docker Hub? 【medium】
- What is Git engraved (fork)? Engraved (fork), What is the difference between a branch (branch) and clone (clone)? 【medium】
- What is the difference between "git pull" and "git fetch"? 【medium】
- What are the advantages and disadvantages of using Ajax? 【medium】
- Cross-domain issues, who cross-domain restrictions, how to solve [the difficulties]
to sum up
Opportunities will always be people who are prepared! Xiao Bian finishing above the base Java + database + SSM message queue framework + Redis + + Spring Boot + Spring Cloud and other eight categories of interview questions and answers, study notes, Xmind mind map share out
Requires the full version of the portal friends can click below to free access to all of the above documents! ! !