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Limited time and open source, with ten years of experience, the architect's private collection of "Java core skills" has helped 21 people enter large factories at the same time

2022-01-27 00:54:08 【Java Yumeng】

As a senior Java Development , I've interviewed a lot of people in recent years . Find out that most interviewers , Although it seems to work hard , But the level of competence they show , But not enough to pass the interview , Or get the expected salary .

in my opinion , The reason for this is , There are mainly two aspects ：

First of all ,“ Know what it is and don't know why it is ”. I've done technology for a few years , Developed some business applications , But I haven't thought about the logic behind these technology choices . therefore , It's hard for me to define their future growth potential , I will not trust to give them tasks with a certain depth .

second , Fragmentation of knowledge , No system . in fact , When the interviewer can't be complete 、 When you clearly describe the system you've developed or the technology you're using , The interviewer will wonder if he has the ability to solve complex problems 、 The ability to design complex systems .

therefore , If you just work hard , Or too much of an implementation detail , I haven't looked up at these technologies , So in preparation for the interview , It's necessary to sort it out Java Knowledge system , Only in this way can we win the satisfied Offer.

here , Share a document that helped me a lot 《Java Core skills 》 , I got it by accident , From a friend of mine , After reading it, he thought it was very good , Very detailed , comprehensive . I asked him where he came from , He only told me that he copied it from a big man who has worked for more than ten years .

The document covers knowledge ：

Interview must ask ：Java Basics 、 High concurrency 、 Multithreading 、 Distributed 、 Design patterns 、Spring Family bucket 、Java、MyBatis、ZooKeeper、Dubbo、Elasticsearch、Memcached、MongoDB、Redis、MySQL、RabbitMQ、Kafka、Linux、Netty、Tomcat And so on knowledge point detailed explanation and interview questions .

In document , It also starts from the knowledge points and necessary abilities of the interview investigation of large factories , Select out 485 Avenue Java Interview questions , It not only gives typical answers and test site analysis , It also analyzes Java Core knowledge points , Let you understand the key ability of interview , Help you get to “ Know why ” And systematic goals .

Java Basics

Java annotation
Java Reflection
Java Generic
Java Inner class
Java Copy
Java serialize
Java Exception classification processing

Java Basic brain maps

JAVA The basis corresponds to the detailed parsing document

Java Multithreaded concurrency

JAVA Concurrent knowledge base
JAVA Thread realize / How it was created
4 Thread pool
Thread life cycle ( state )
Thread termination 4 Ways of planting
sleep And wait difference
start And run difference
JAVA Background thread
JAVA lock
Thread basic method
Thread context switch
Synchronization lock and deadlock
Thread pool principle
JAVA Blocking queue principle
CyclicBarrier、CountDownLatch、Semaphore Usage of
volatile The role of keywords （ Variable visibility 、 No reordering ）
How to share data between two threads
ThreadLocal effect （ Thread local storage ）
synchronized and ReentrantLock The difference between
ConcurrentHashMap Concurrent
Java Thread scheduling used in
Process scheduling algorithm
What is? CAS（ Compare and exchange - Optimistic locking mechanism - Lock spin ）
What is? AQS（ Abstract queue synchronizer ）