350 lines in Java interview questions cut to the heart, in order to prepare gold and three silver four I also fight

Preface:

2020 can not wait to come, they say 2020-1024 = 996, this year is bound to be an extraordinary year, I believe many of my friends may have intended to quit looking for work after the Spring Festival, or that from now on preparing for intense gold and three silver four, we must be fully prepared, if not well-prepared interview, complete waste of time, it is not responsible for their own.

Today to share with you my finishing the interview topics and answers Java architecture, most of which are large enterprises face interview frequently asked questions, you can control this leak filled, of course, and certainly listed here can not cover all the way, but also I am hoping to play some help to find a job soon friends! As many in this text, I summed up the java interview involved the scope and structure of frequently asked interview topics and answers and architecture videos free to share to you, the end of the text has to receive!

Performance Tuning Box

Performance Optimization finishing a .tomcat

1. How you give tomcat tuning

2. How to increase the number of links tomcat

3. How to increase the tomcat memory

4. tomcat how to stop the file directory under the column

5. There are several ways to deploy tomcat

6. Optimization of experience tomcat

Two .Jvm Performance Optimization column

• Java in the loading process

• Java memory allocation

• Describe the principle mechanism jvm loaded class files

• What gc that? Why should gc

• Description of Java garbage collection

• How to determine whether an object is alive

• Garbage collection a bit and principles, and the use of two kinds of recovery mechanisms

• What is the basic principle is that the garbage collector? Garbage collector can immediately reclaim memory?

• Java will be a memory leak it? Please describe

• Deep and shallow copy copy

• System.gc () and Runtime.gc () will do anything

• fifinalize () method is called when? What is the purpose destructor (fifinalization) is?

• If the object is referenced set rull, if the garbage collector will immediately release the memory occupied by objects?

• What is a distributed garbage collection, how it works

• What is the difference between serial (Serial) collector and throughput (throughput) is collector

• Garbage can be recycled at what time Java objects?

• Description of Java memory allocation and recovery policy rates and Minor GC and Major GC

• Permanent behalf of the JVM garbage collection will happen yet

• Java garbage collection method in which

• 什么是内加载器，内加载器有哪些

• 类加载器双亲委派模型机制?

微服务架构面试专栏

一.SpringCloud面试整理

• 什么是SpringCloud

• SpringCloud有什么优势

• 服务注册和发现是什么意思?SpringCloud如何实现

• 负载平衡的意义是什么

• 什么是Hystrix?它如何实现容错?

• 什么是Hystrix断路器?我们需要它吗

• 什么是Netflflix Feign?他的优点是什么

• 什么是SpringCloud bus?我们需要它吗

二.springboot面试题整理

• 什么是springboot

• springboot有哪些优点

• 什么是JavaConfifig?

• 如何重新加载springboot上的更改，而无需重新启动服务器

• springboot中的监视器是什么?

• 如何在springboot中禁用Actuator端点安全性

• 如何在自定义端口上运行springboot应用程序

• 什么是YAML?

• 如何实现springboot应用程序的安全性

• 如何集成springboot和ActiveMQ?

• 如何使用springboot实现分页跟排序

• 什么是swagger?你用springboot实现他了吗

• 什么是Spring Profifiles?

• 什么是Spring Batch?

• 什么是FreeMarker模板?

• 如何使用springboot实现异常处理?

• 你使用了哪些starter maven依赖项

• 什么是csrf***?

• 什么是AOP

三.Dubbo面试整理

• Dubbo中zookeeper做注册中心，如果注册中心的集群都挂掉，发布者和订阅者之间还能通信吗

• Dubbo服务负载均衡策略?

• Dubbo在安全机制方面是怎么解决的

• Dubbo链接注册中心和直连有什么区别

并发编程高级面试专栏

• Synchronized用过吗?其原理是什么?

• 如何获取对象的锁，这个"锁"是指什么?如何确定对象的锁

• 什么是可重入性，为什么说Synchronized是可重入锁?

• JVM对Java的原生锁做了哪些优化?

• 为什么说Synchronized是非公平锁

• 什么是锁消除和锁粗化

• Why Synchronized is a pessimistic lock? What principle to achieve optimistic locking is?

• Optimistic locking it certainly is good

• Compared with Synchronized, reentrant lock ReentrantLock implementation principle any different

• Then please talk about how it AQS framework

• Synchronized and contrast similarities and differences ReentrantLock detailed as possible

• How ReentrantLock achieve reentrancy of

• In addition to ReentrantLock, which you have come into contact with the concurrent tool juc

• Please talk about ReadWriteLock and StampedLock

• How to make Java thread synchronization with each other

• ̵CyclicBarrier and CountDownLatch look similar, please contrast of

• How the Java thread pool is implemented

• Several core configuration parameters to create a thread pool

• Compare the similarities and differences of the next volatile contrast Synchronized

• ThreadLocal is how to solve concurrency safe

Due to space limitations there are several columns not share it, tidied face questions PDF documents can come to me to receive oh

to sum up:

For face questions on the above, I summed up the Internet company java programmers involved in most of face interview questions and answers made the document architecture and free for everyone to share video material (including Dubbo, Redis, Netty, zookeeper, Spring cloud , distributed, high concurrency architecture technical information), hoping to help review your pre-interview and find a good job, but also saves you the time to search for information online learning, you can also concerned about me in the future there will be more dry goods share.

Receive way: My concern for the kind of numbers (Java Zhou people) can receive

This document has 127 includes answers to these questions of the surface, surface 350 questions, all with detailed analysis