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get ready: Markdown authoring tool Youdaoyun notes Idea development tools GItHub project address analysis: The whole process of class loading and running: When we use the java command to run the main function of a class to start the program, we first need to load the main class into the JVM through th ...

1.1 Java introduction What is Java Java is a programming language developed by James Gosling of SUN (acquired by Oracle) in the early 1990s. It was officially released in 1995. Java is a cross platform language based on JVM Programming languages are compiled and interpreted. Compiled languages suc ...

java singleton mode means to ensure that there is only one instance of a class and provide the instance to the global during the whole system operation. Main implementation mode: 1, Instant load Class objects are created as soon as the class file is loaded, whether or not they are called. (starving ...

Today, I mainly solved the verification of the login status of the test account. My current solution is to use the special syntax uid=123 when writing the test case, which means that the field of the use case should go to the login credentials of the test account with uid equal to 123. The difficulty is that the login credentials will expire an ...

Another post: Spring Boot tutorial 16: implementing multithreading with Spring Boot injection class SpringBoot injection multi instance, multi thread processing   Seeing this title, I'm sure many people will be puzzled. Looking back on your own scenarios, we will find that in Spring projects, multithreading is rarely used to process tasks. Y ...

annotation Annotation is a technology introduced from JDK 5.0 The role of Annotation: It's not the program itself, it can explain the program (it's no different from comment) Can be read by other programs (such as compilers) Annotation format Annotation exists in "@ annotation name&quot ...

if fast or switch fast? Do you want to specify the initialization size of HashMap? How much performance can be improved after it is specified? Which serialization method takes less time? No matter what the reason is, it is necessary to evaluate the performance. In most cases, it is not enough to simply answer who is fast and who is slow. How to ...

Learning notes and development of JUC Java JUC 1 Introduction to Java JUC 2 volatile keyword - memory visibility 2.1 memory visibility 2.2 volatile keyword 3 atomic variables and CAS algorithm 3.1 atomic variables 3.1.1 atomicity of I + + 3.1.2 atomic variables 3.2 CAS algorithm 3.2.1 ABA prob ...

The copyright of this article belongs to the official account of WeChat public code ID:onblog. If it is reproduced, please keep the original statement of the paragraph, and the offender will investigate it. If there are any shortcomings, please welcome the official account of WeChat public. ] Yesterday, I found out by accident lombok The auth ...

By Lyl Daisyhttps://blog.csdn.net/kkkkk0826/article/details/104171355 String string is one of the most commonly used types in the system, which occupies a large amount of memory in the system. Therefore, efficient use of string can improve the performance of the system. In the process of work and learning, I summarized the following three sch ...