Outsourcing for five years, abandoned

If you weren't abandoned by your girlfriend , I guess I haven't awakened yet . Junior college students ,19 In, he entered a software company in Hunan through school recruitment , It's close 5 Year of CRUD, At the beginning of the 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 have been working in an enterprise for five 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 , Look at this year's golden three silver four ！

At the beginning of preparation , I've been blinded , Five years 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, After reading it, I knelt directly to my brother .. Now the interview is stable

Share it for free , Whether it's used to consolidate the foundation , Or in the interview to improve competitiveness, you can collect one , Take a look at it when you have time , 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 .