Java technology is complicated, so what should we mainly learn in the process of learning Java?
The following computer training in Shenzhen will give you a detailed introduction.
Java reflection technology is a necessary technology to write a framework, but there are serious performance problems. Nio instead of Java bytecode technology has nothing to say. It is worth noting the characteristics of "direct memory" and the use of scenarios.
Java multithreading synchronization and asynchronism, the realization principle of various set objects in Java, and understanding these can help you choose the appropriate data structure when solving problems and solve problems effectively.
Proficient in using various data structures and algorithms, such as arrays, hashes, linked lists, sorting trees, etc. ..............................................................................................................................................
Shenzhen IT Training believes that there are many extensions here, which need some application experience to solve various performance or business problems.
It is very important to be familiar with tcp protocol. You need to master the whole process of creating a three-way handshake and disconnecting a four-way handshake.
Without understanding, it is impossible to optimize high concurrency network applications.
Familiar with http protocol, especially http header.
Many people spend years trying to figure out the life cycle of conversations and cookie and their relationship.
Database design function, the use of mysql is essential, and Shenzhen IT training found that this is the most basic database tool, free and easy to use, can optimize basic parameters, slow query log analysis, master-slave replication configuration, can become half of mysqldba.
Other nosql databases such as mongodb.
There is also the use of queue middleware.
For example, message push can be written into the database, pushed to the queue server, and then sent to the queue by the push server, so that the message can be directly fed back to the user and placed in the database and queue behind the message, and the push process is pushed by the server and queue.
Shenzhen computer training believes that the server is completed in this way, with the advantage of asynchronism, reducing the pressure on the server and solving system problems.