What are the requirements to become a Java senior engineer?
1. Core Java is the base of java and the class library of JDK. Many children's shoes will say, I understand JDK, but it is not enough. If you know it, you need to know why. The source code of JDK is very well written, and you should check it often. , For frequently used classes, such as String, collection classes (List, Map, Set) and other data structures, it is necessary to know their implementation, what is the difference between different collection classes, and then know which collection class to use in a specific situation. Suitable and more efficient, these contents are OK to look at the source code directly
2. Multi-threaded concurrent programming. Now concurrency is almost a necessary technology for writing server-side programs. It is necessary to be familiar with multi-threading in Java, including object lock mechanism, synchronized keyword, and concurrent package. Part of it is recommended that you read the book "Java Concurrent Programming Practice", which explains in detail
3. I/O, Socket programming, first of all, you must be familiar with Socket programming in Java and I/O packages, and then go deeper into Java NIO, and then go deeper into the Socket implementation at the bottom of the operating system, and understand how sockets are implemented in Windows and Linux Yes, if you want to learn Java, you can come to this group. The first is 532, the middle is 259, and the last is 952. There are a lot of learning materials for download.
4. Some knowledge of JVM does not need to be familiar, but needs to be understood. This is the essence of Java. It can be said to be the mother of Java. After understanding, the vision will be wider, such as the Java memory model (which will help understand Java locks and multithreading). ), bytecode, JVM model, various garbage collectors and options, JVM execution parameters (optimizing the JVM), etc., these knowledge are explained in detail in the book "In-depth Java Virtual Machine", or go to View the specific version of the JVM specification on the oracle website.
5. Some common design patterns, such as singletons, template methods, proxies, adapters, etc., as well as the implementation of specific scenarios in Core Java and some Java frameworks, may need to be accumulated slowly, first understand what usage scenarios are available, The more you see it, the more you will use it.
6. Common databases (Oracle, MySQL, etc.), SQL statements and general optimization
7. Java web development frameworks, such as Spring, iBatis and other frameworks, also their principles are the most important, at least to know their general principles.
8. Other well-known open source frameworks and packages, Netty network framework, Apache common's N packages, Google's Guava, etc., you can also often go to Github to find some codes to see.
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