What technologies do Java engineers need to master?

Techniques that Java engineers need to master: 1. CoreJava, you can look at the source code directly; 2. Multi-threaded concurrent programming; 3. I/O, Socket programming; 4. Some knowledge of JVM; 5. Some commonly used Design patterns; 6. Commonly used databases such as Oracle, MySQL, etc.; 7. JavaWeb development framework.

Techniques that Java engineers need to master:

1.CoreJava is the Java foundation and JDK class library. Many children will say that I understand JDK, but understanding is not enough. To know what is happening, you must also know why. The source code of JDK is very well written. You should check it frequently. For frequently used classes, such as String, collection class (List) , Map, Set) and other data structures, you need to know their implementation and what are the differences between different collection classes. Then you can know which collection class is more suitable and efficient to use in a specific situation. For these contents, just look at the source code. .

2. Multi-threaded concurrent programming. Nowadays, concurrency is almost a necessary technology for writing server-side programs. You must be familiar with multi-threading in Java, including the object lock mechanism, synchronized keyword, and concurrent package. You must be very familiar with it. For this part, I recommend you read the book "Java Concurrent Programming Practice", which explains it in detail.

3. I/O and Socket programming. First of all, you must be familiar with Socket programming in Java and the I/O package. The next step is JavaNIO, and the next step is the Socket implementation at the bottom of the operating system. Understand Windows and Linux. How to implement socket in .

4. You don’t need to be familiar with some knowledge of JVM, but you need to understand it. This is the essence of Java, which can be said to be the mother body of Java. After understanding it, your horizons will be broader, such as the Java memory model (which will help you understand Java Locks, multi-threading (helpful), bytecode, JVM models, various garbage collectors and choices, JVM execution parameters (optimizing JVM), etc., this knowledge is available in the book "In-depth Java Virtual Machine" For a detailed explanation, or go to the Oracle website to view the specific version of the JVM specification. What knowledge do you need to learn Java?

5. Some common design patterns, such as singletons, template methods, proxies, adapters, etc., as well as the implementation of specific scenarios in CoreJava and some Java frameworks, may need to be accumulated slowly, and you need to understand them first. If you see a lot of usage scenarios, you will naturally use them yourself.

6. Commonly used databases (Oracle, MySQL, etc.), SQL statements and general optimization.

7. JavaWeb development frameworks, such as Spring, iBatis and other frameworks, their principles are also the most important, at least you must know their general principles.

8. Some other well-known open source frameworks and packages that are widely used, such as Netty network framework, Apachecommon's N multi-package, Google's Guava, etc. You can also often go to Github to find some codes. That’s all I can think of for the time being. Items 1-4 are the basics of Java. It is difficult to understand all this knowledge without a certain amount of time to accumulate it. But after you understand it, you will have a thorough understanding of Java. Items 5 and 6 are required. The additional technologies to learn, 7-8 are all based on items 1-4. As the saying goes, the first 4 items are the soul of Java. I hope they can be helpful to you.

9. Learn to use Git. If you are still using SVN, quickly jump into the arms of Git

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