With this PDF, we finally got offers from eight major manufacturers, including Alibaba, bytek and Baidu

How to get the big factory offer, Not mastering absolute technology , Then we should keep learning

How did I get Ali , Tencent and other eight big factories offer What about , Today I share my secret weapon , Organized by meituan Dazhen Java Core knowledge points , What the interviewer must ask about during the interview , The chapter includes a lot of knowledge , It includes basic knowledge 、Java aggregate 、JVM、 Multithreaded concurrency 、spring principle 、 Microservices 、Netty And RPC 、Kafka、 Diary 、 Design patterns 、Java Algorithm 、 database 、Zookeeper、 Distributed cache 、 Data structure, etc .

Because the whole document is comprehensive , More content , So there may be some omissions in the knowledge I share , Chaos and chaos , The whole core knowledge points are arranged in one pdf It's in the document , Friends who need information can get free of charge at the end of the article ,

Whether it's used to consolidate the foundation , You can collect one for technical improvement , Read and learn thoroughly , Interview big factory so easy.

Here are some screenshots , Free download method is attached at the end of the article .

( One ). Basics

1、Java Basic skill

• Java introduction ( Basic concepts and common sense )
• Java grammar
• Basic data type
• Method ( function )

2、Java object-oriented

• Classes and objects
• Three characteristics of object orientation
• Modifier
• Interfaces and abstract classes
• Other important knowledge points

3、Java The core technology

• aggregate
• abnormal
• Multithreading
• File with the I\O flow

( Two ). Concurrent

1、 Concurrent container

• JDK Summary of concurrent containers provided
• ConcurrentHashMap
• CopyOnWriteArrayList
• ConcurrentLinkedQueue
• BlockingQueue
• ConcurrentSkipListMap

2、 Thread pool

• The benefits of using thread pools
• Executor frame
• ( important )ThreadPoolExecutor Class introduction
• ( important )ThreadPoolExecutor Examples of use
• Several common thread pools are explained in detail
• ScheduledThreadPoolExecutor Detailed explanation
• Thread pool size determination

3、 Optimistic lock and pessimistic lock

• What is pessimistic lock and optimistic lock
• There are two common ways to implement optimistic locks
• Disadvantages of optimistic lock
• CAS And synchronized The use of

( 3、 ... and ). JVM

1、Java Memory area

• summary
• Run time data area
• HotSpot Exploring virtual machine objects
• Key supplementary content

2、JVM Garbage collection

• uncover JVM The mystery of memory allocation and recovery
• The object has died ?
• Garbage collection algorithm
• Garbage collector

3、JDK Monitoring and troubleshooting tools

• JDK Command line tools
• JDK Visual analysis tools

（ Four ） The Internet 、linux、 Data structure and algorithm 、 database 、 The system design 、 Must know tool 、 Interview guide

Because the space is limited , Other contents will not be shown one by one , This advanced note has a total of 512 page . It should be very helpful for small partners who want to advance , I hope it can help you .

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