It’s too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Time:2021-8-14

Today’s sharing begins. Please give us more advice~

Although most interviewers seem to work hard, their ability level is not enough to pass the interview or get the expected salary.

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

In my opinion, there are two main reasons for this situation:

First, “know what it is and don’t know why”.I have developed some business applications for several years, but I haven’t thought about the logic behind these technology choices. Therefore, it is difficult for me to locate their future growth potential, and I will not rest assured that I will give them a certain depth of tasks.

Second, knowledge is fragmented and unsystematic.In fact, when the interviewer cannot completely and clearly describe the system he developed or the related technology he used, the interviewer will doubt whether he has the ability to solve complex problems and design complex systems.

Therefore, if you usually only know to work hard or pay too much attention to some implementation details without looking up to examine these technologies, it is necessary to comb the java knowledge system when preparing for the interview, so as to win a satisfactory offer.

The document covers knowledge:

What you must ask in the interview: detailed explanation of knowledge points such as Java foundation, high concurrency, multithreading, distribution, design pattern, spring bucket, Java, mybatis, zookeeper, Dubbo, elasticsearch, memcached, mongodb, redis, mysql, rabbitmq, Kafka, Linux, netty, Tomcat, etc. and interview escort.

In the document, 485 Java interview questions are selected from the knowledge points and necessary abilities of the interview and investigation of large factories. They not only give typical answers and analysis of test sites, but also analyze the core knowledge points of Java, so that you can understand the key abilities investigated in the interview and help you achieve the goal of “knowing why” and systematization.

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Java Foundation

  • Java annotation
  • Java reflection
  • Java generics
  • Java inner class
  • Java replication
  • Java serialization
  • Java exception classification and handling

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Java basic brain map
Detailed parsing document corresponding to Java Foundation

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Detailed parsing document corresponding to Java Foundation

Java multithreading concurrency

  • Java Concurrent knowledge base
  • Java thread implementation / creation mode
  • 4 thread pools
  • Thread lifecycle (state)
  • There are four ways to terminate threads
  • What is the difference between sleep and wait
  • The difference between start and run
  • Java background thread
  • Java lock
  • Thread basic method
  • Thread context switching
  • Synchronization lock and deadlock
  • Thread pool principle
  • Java blocking queue principle
  • Usage of cyclicbarrier, countdownlatch and semaphore
  • Role of volatile keyword (variable visibility, prohibition of reordering)
  • How to share data between two threads
  • ThreadLocal function (thread local storage)
  • The difference between synchronized and reentrantlock
  • Concurrent HashMap
  • Thread scheduling used in Java
  • Process scheduling algorithm
  • What is CAS (compare and swap – optimistic lock mechanism – lock spin)
  • What is AQS (Abstract queue synchronizer)

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Java multithreading concurrent brain diagram
Java multithreading concurrent knowledge point corresponding detailed analysis document

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Java multithreading concurrent knowledge point corresponding detailed analysis document

JVM

  • thread
  • JVM memory area
  • JVM runtime memory
  • Garbage collection and algorithm
  • Java four reference types
  • GC generation collection algorithm vs partition collection algorithm
  • GC garbage collector
  • JAVA IO/NIO
  • JVM class loading mechanism

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

JVM brain map

Analysis of detailed documents corresponding to JVM brain map

JVM detailed document parsing

Spring principle

  • Spring features
  • Spring core components
  • Common spring modules
  • Spring main package
  • Common spring annotations
  • Spring third party integration
  • Spring IOC principle
  • Spring AOP principle
  • Spring MVC principle
  • Spring boot principle
  • JPA principle
  • Mybatis cache
  • Tomcat architecture
  • It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Spring schematic diagram

Detailed analysis documents corresponding to spring principles

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Detailed analysis documents corresponding to spring principles

database

  • Storage engine
  • Indexes
  • Three paradigms of database
  • The database is a transaction
  • stored procedure
  • trigger
  • Database concurrency strategy
  • Database lock
  • Redis based distributed lock
  • Partition table
  • Two phase submission agreement
  • Three phase submission agreement
  • Flexible transaction
  • CAP

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Detailed parsing document corresponding to database

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Detailed parsing document corresponding to database

Data structure and algorithm

  • data structure
  • encryption algorithm
  • Java algorithm
  • Consistency algorithm

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Data structure and algorithm brain map

Microservices

  • Service registration discovery
  • API gateway
  • Configuration center
  • Event scheduling (Kafka)
  • Service trace (starter sleuth)
  • Service fuse (hystrix)
  • API management
  • It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Microservice brain map

Microservices are important for parsing documents

Microservices are important for parsing documents

Netty and RPC

  • Netty principle
  • Netty high performance
  • Netty RPC implementation
  • RMI implementation mode
  • Protoclol Buffer
  • Thrift

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Netty and RPC brain map

Detailed parsing documents for netty and RPC

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Detailed parsing documents for netty and RPC

network

  • Network 7-layer architecture
  • TCP / IP principle
  • TCP three handshakes / four waves
  • HTTP principle
  • CDN principle

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Zookeeper

  • Zookeeper concept
  • Zookeeper role
  • How zookeeper works (atomic broadcasting)
  • Znode has four forms of directory nodes
  • It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Kafka

  • Kafka concept
  • Kafka data storage design
  • Producer design
  • Consumer Design

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

RabbitMQ

  • concept
  • Rabbitmq architecture
  • Exchange type

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Hbase

  • concept
  • Column storage
  • HBase core concepts
  • HBase core architecture
  • Write logic of HBase
  • HBase vs Cassandra

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Cassandra

  • concept
  • data model
  • Cassandra consistent hash and virtual nodes
  • Mission protocol
  • Data replication
  • Data write request and coordinator
  • Data read request and background repair
  • Data storage (commitlog, memtable, sstable)
  • Secondary index (generate rowkey for the value summary to be indexed)
  • Data reading and writing
  • It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

load balancing

  • Four layer load balancing vs seven layer load balancing
  • Load balancing algorithm / strategy
  • LVS
  • Keepalive
  • Nginx reverse proxy load balancing
  • HAProxy

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

HaDoop

  • concept
  • HDFS
  • MapReduce
  • Life cycle of Hadoop MapReduce job

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Spark

  • concept
  • Core architecture
  • Core components
  • Spark programming model
  • Spark calculation model
  • Spark operation process
  • Spark RDD process
  • SPARK RDD

It's too strong. With the core Java skills shared by Alibaba P8, it won offers from three major manufacturers in January

Summary

Here, I’d like to share a document that has helped me a lot, I got it by chance. After reading it, I think it’s very well written, very detailed and comprehensive, but a small part of the content hasn’t been updated yet.

Today’s sharing is over, please forgive and give advice!