Outsourcing for three years, abandoned

Let's talk about our situation first . Junior college students ,19 In, he entered a software company in Hunan through school recruitment , It's close 3 Year of CRUD, Early this year , I feel like I can't go on like this , Staying in a comfortable environment for a long time can make a person degenerate ！ And I've been in an enterprise for three years CRUD, It's made me less enterprising , Talked about 2 My girlfriend, who has been living for more than 20 years, broke up with me because of my mentality and salary . therefore , I decided to change the status quo , Hit the big factory .

At the beginning of preparation , I've been blinded , Three years of CRUD I didn't make any progress in my technology , Only my age has been promoted ...

Can't , I found my brother in Tencent , As his little old watch , After he learned about me （ Almost Java The foundation begins ）, Just throw me a net disk , Speaking of ：“ Go for it , Here's everything you need , Don't come to me , I think it's embarrassing ！”.

There is a complete set in the plate Java Necessary documents for interview PDF, He says it is GitHub Superscript star 120k Of 《Java Comprehensive analysis of intermediate and advanced core advanced knowledge 》, After reading it, I knelt directly to my brother .. Now the interview is stable

Here I share it for free , 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 .

You can click on the business card below for free .