Are interviews all about memorizing answers?

Preface

I don't know when to start , Eight part essay has become a kind of atmosphere ！

Now the interview doesn't ask about the two eight part essays. I feel that there is something missing .

The enterprise is interested in Java Programmers are demanding more and more , They would rather sacrifice more time costs , We should also pick out more capable 、 More experienced candidates .

Does that mean , It's getting harder and harder to get a high salary ？ In my submission “ broken ” The key is , We must accurately understand the current enterprise needs ！

Collected in recent months N A carefully calibrated copy of PDF Version of Java Encyclopedia of eight part essay , involve Java All aspects of the back end , Share with you . I hope it can help you review before the interview and find a good job , It also saves time for people to search information on the Internet to learn .

Download address ： Self scanning code to receive

One 、Java Basics

1、 What is object-oriented ？

2、JDK JRE JVM

3、== and equals Compare

4、hashCode And equals

5、final

6、String、StringBuffer、StringBuilder

7、 The difference between overloading and rewriting

8、 The difference between interface and abstract class

9、List and Set The difference between

10、ArrayList and LinkedList difference

11、HashMap and HashTable What's the difference? ？ What is the underlying implementation ？

12、ConcurrentHashMap principle ,jdk7 and jdk8 Differences in versions ？

13、 What is bytecode ？ What are the advantages of bytecode ？

14、Java The abnormal system in

15、Java Class loader

16、 Parent commission model

17、GC How to judge whether an object can be recycled

Two 、 Threads 、 Concurrent correlation

1、 The life cycle of a thread ？ Threads have several States

2、sleep()、wait()、join()、yield() The difference between

3、 Understanding of thread safety

4、Thread、Runable The difference between

5、 Understanding of daemons

6、ThreadLocal Principle and use scenario of

7、ThreadLocal Cause of memory leak , How to avoid

8、 Concurrent 、 parallel 、 The difference between serial

9、 Three features of concurrency

10、volatile

11、 Why pool threads ？ Explain the thread pool parameters ？

12、 Briefly describe the thread pool processing flow

13、 The role of blocking queues in thread pools ？ Why add a queue first instead of creating the largest thread first ？

14、 Principle of thread reuse in thread pool

3、 ... and 、spring

1、 How to achieve a IOC Containers

2、spring What is it? ？

3、 Talk to you about AOP The understanding of the

4、 Talk to you about IOC The understanding of the

5、BeanFactory and ApplicationContext What's the difference? ？

6、 Describe the Spring Bean Life cycle of ？

7、 Explain Spring Several kinds of support bean Scope of action .

8、Spring Single example in framework Bean Is it thread safe ？

9、Spring What design patterns are used in the framework ？

10、Spring The implementation and principle of transaction and isolation level ？

11、spring Transaction propagation mechanism

12、spring When will the transaction fail ?

13、 What is? bean Automatic assembly of , What are the ways ？

Four 、springmvc、springBoot、Mybatis

1、Spring Boot、Spring MVC and Spring What's the difference?

2、SpringMVC Workflow

3、Spring MVC The main components of ？

4、Spring Boot Auto configuration principle ？

5、 How to understand Spring Boot Medium Starter

6、 What is embedded server ？ Why use an embedded server ?

7、mybatis Advantages and disadvantages

8、MyBatis And Hibernate What are the differences ？

9、#{} and ${} What's the difference ？

10、 sketch Mybatis How the plug-in works , How to write a plug-in .

5、 ... and 、MySQL and Redis

1、 The fundamentals of indexing

2、mysql The difference between clustered and nonclustered indexes

3、mysql The data structure of the index , Their advantages and disadvantages

4、 The principles of index design ？

5、 What is the leftmost prefix principle ？ What is the leftmost matching principle

6、 What are the types of locks

7、InnoDB Storage engine lock algorithm

8、 I care about the business system sql Is it time consuming ？ Is the statistics too slow ？ How to optimize slow queries ？

9、 The basic characteristics and isolation levels of transactions

10、ACID By what guarantee ？

11、 What is? MVCC

12、 After the table is divided, it is not sharding_key How to deal with the query of , Sort after the table is divided ？

13、mysql Master slave synchronization principle

14、 sketch MyISAM and InnoDB The difference between

15、 sketch mysql Index type and its impact on the performance of the database

16、mysql What do you think of the implementation plan

6、 ... and 、Redis

1、RDB and AOF Mechanism

2、Redis The deletion policy of expired key

3、Redis Threading model 、 The reason why single thread is fast

4、 sketch Redis Transaction implementation

5、redis Cluster solution

6、redis The core principle of master-slave replication

7、 Cache avalanche 、 Cache penetration 、 Cache breakdown

7、 ... and 、 Distributed and microservices

1、CAP theory ,BASE theory

2、 Load balancing algorithm 、 type

3、 Distributed architecture ,Session What's the solution to sharing

4、 Briefly describe what you are right about RPC、RMI The understanding of the

5、 Distributed id Generation scheme

6、 Distributed lock solutions

7、 Distributed transaction solutions

8、 How to realize the idempotency of interface

9、 sketch ZAB agreement

10、 sketch zk The naming service 、 Configuration Management 、 Cluster management

11、 Talk a Zookeeper watch Mechanism

12、zk and eureka The difference between

13、Spring Cloud and Dubbo The difference between

14、 What is? Hystrix？ Briefly describe the implementation mechanism

15、springcloud Core components and their functions

16、Dubbo The overall architecture design and layering of

8、 ... and 、 middleware MQ

1、 sketch RabbitMQ Architecture design

2、RabbitMQ How to ensure that messages are sent ？ Message reception ？

3、RabbitMQ Transaction message

4、RabbitMQ Dead letter queue 、 Delay queue

5、RabbitMQ Mirror queue mechanism

6、 sketch kafka Architecture design

7、kafka How to deal with message order 、 Repeat send 、 Repeated consumption 、 Lost message

8、Kafka Under what circumstances will there be message loss and solutions ？

9、Kafka yes pull？push？ SWOT Analysis

10、Kafka in zk The role of

11、 sketch kafka Of rebalance Mechanism

12、Kafka What's so good about it

Last

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