From a professional background, I can't get into a small company for interview

I saw a post in Zhihu yesterday , A new year computer major went to interview an outsourcing company Java The post was brushed down , The comment area is full of a cheerful atmosphere . Once you understand the reason, you know , The old man didn't learn anything in four years of College , I don't know how to get my diploma , Although he is a professional, he can't work at all .

In fact, this is normal , Many computer majors have poor mastery of basic technology , I'm not qualified to be a programmer at all . Although most people laugh at him , But there are also serious suggestions , Now the industry is very impetuous , Many enterprises attach great importance to students' project experience , Even those without internship or project experience are not qualified to enter the interview .

Want to stand out in the job season , Successfully get the entry invitation , Even get a high salary , Then we should make the following efforts ：

• Have clear learning advanced planning , Systematically master deeper Technology ;
• Clarify the capability requirements of the target position , Targeted improvement of technical capability ;
• Increase actual combat experience , High efficiency, improve the ability to solve practical problems .

however , I really want to improve my ability to a higher level in a short time , That's not easy . Most people don't have a clear goal 、 Lack of practice , You can't put complex and abstract ideas to the ground , Slave function 、 performance 、 Usability 、 Systematic planning of R & D cost and so on , This makes it difficult for us to move forward .

Here I share one for free GitHub Superscript star 120k Of 《Java Comprehensive analysis of core advanced knowledge 》 Let's see , 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 .