I am 37 this year, and I was rushed by a big factory to...

There are many programmers and friends around, and many developers in their 30s feel that they have lost their competitiveness compared with young people.I don't even know how to comfort them.As a Java architect, I am almost 37 this year. To be honest, there are not a few big companies who want to dig me.

No matter what direction you are in, age will always be a pressure. As for how not to be eliminated at the age of 35, here are some suggestions for you:

1. No matter how old you are, I hope you can maintain a progressive heart and always maintain a sense of crisis.

2. Those who do technology can go deep in a certain technical direction. If they can't go through, they can go to management. If they can't go through management, they can go to products. If products don't go well, they can go to lecturers.It is not a constant layer, as long as you can survive and make money, other industries can still choose.

3. Self-awareness and continuous improvement of experience are very important. No matter how busy I am, I will spend about an hour every day to consolidate knowledge and improve myself.

All the notes, interview questions, resumes and other materials mentioned below are available at the end of the article for details!

Part 1 Java

(1). Basics

1. Java Basics

1. Introduction to Java (basic concepts and common sense)
2. Java syntax
3. Basic data types
4. Method (function)

2. Java Object Orientation

1. Classes and Objects
2. Three characteristics of object-oriented
3. Modifier
4. Interfaces and abstract classes
5. Other important knowledge points

3. Java Core Technology

1. Collection
2. Exception
3. Multithreading
4. Files and I\O Streams

(two). Concurrent

1. Concurrent Containers

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

2. Thread Pool

• Benefits of using thread pools
• Executor Framework
• (Important) A brief introduction to the ThreadPoolExecutor class
• (Important) ThreadPoolExecutor usage example
• Detailed explanation of several common thread pools
• ScheduledThreadPoolExecutor Details
• The thread pool size is determined

3. Optimistic locking and pessimistic locking

• What is pessimistic locking and optimistic locking
• Two common implementations of optimistic locking
• Disadvantages of optimistic locking
• The usage scenarios of CAS and synchronized

(three). JVM

1. Java memory area

• Overview
• Runtime data area
• HotSpot Virtual Machine Objects
• Key Supplement

2. JVM Garbage Collection

• Demystifying JVM memory allocation and reclamation
• The object is dead?
• Garbage Collection Algorithms
• Garbage collector

3. JDK Monitoring and Troubleshooting Tools

• JDK Command Line Tools
• JDK Visual Analysis Tool

Interview Guidelines

(1). How to write a programmer's resume

1. Why is a resume important?
2. The following things you must know
3. Two rules you must know
4. How to write project experience?
5. How to write professional skills?
6. Typography Notes
7. Some other small tips

(2). How to prepare for an interview

1. How to get an interview opportunity at a big factory?
2. Preparing for the interview
3. Review after the interview
4. How to learn? Is it necessary to learn various frameworks?

(3). Java learning route and method recommendation

1. Java Basics
2. Operating Systems and Computer Networks
3. Data Structures and Algorithms
4. Front-end knowledge
5. MySQL
6. Common tools
7. Common frameworks
8. Simple use of multithreading
9. Distributed
10. In-depth study
11. Microservices
12. Summary

Okay, this is the end of this article. I have organized the answers to all the above questions into PDF