Programmer Group

springboot version 2.5.5 Debug Roadmap Many words are tears. Let's look at the picture. Let's start with run After using Springboot for so many years, what has this run() method done? @SpringBootApplication public class SpringbootDemoApplication { public static void main(String[] args) { SpringApplication.run(SpringbootD ...

java foundation - detailed explanation of keywords final static this super **final keyword final modifies classes, methods, and variables that are immutable 1.final modified methods cannot be overridden 2. The variable modified by final is a constant. If it is a variable of basic data type, the array will not change once initialized. If ...

@Concepts, differences and execution order of PostConstruct, @ PreDestroy and initMethod, destroyMethod, InitializingBean and DisposableBean @PostConstruct Definition related This annotation is added to the Java EE5 specification, not spring. Spring means that it follows this specification and plays a certain role in the Servlet life cy ...

Sorting: the focus of written examination and interview. 1. Algorithm description; 2. Realization; 3. Efficiency analysis (time complexity, space complexity, stability) Difficulty: too many sorting algorithms Stability: for data with the same keyword (the same number), if A is in front of A 'before sorting, the algorithm is stable if A is i ...

PS: Sword finger offer is not only an interview guide that many students will refer to when looking for a job, but also an algorithm Guide (the main reason why it is so popular is that it provides a step-by-step optimization solution, which I think is very friendly). Now many Internet algorithm interview questions can be found here. For the con ...

catalogue 1, What is JUC?   2, Processes and threads? 3, Locks package   ① The traditional synchronized lock keyword. Sync code block:   Synchronization method:   ② Lock lock 4, Consumer producer issues. 5, 8 lock phenomenon. 6, Collection class unsafe ① List (ArrayList) is not safe ② Set (hashSet) is not secure ...

1, Introduction to java java features 1. Object oriented Basic features: class, object Three characteristics: Encapsulation: internal details are transparent to external calls, and external calls do not need to be modified or care about internal implementation Inheritance: inherit the methods of the base class and make your own changes a ...

Absrtact: the garbage collection mechanism is the best example of a daemon thread because it always runs in the background. This article is shared from Huawei cloud community< This article takes you to understand the garbage collection mechanism in Java >, author: Hai Yong. introduce In C/C + +, programmers are responsible for the cre ...

This paper mainly analyzes the memory management scheme in memory management and the underlying source code analysis of retain, retain count, release and dealloc ARC & MRC Memory management schemes in iOS can be roughly divided into two categories: MRC (manual memory management) and ARC (automatic memory management) MRC In the MRC era, ...

https://www.cnblogs.com/crazymakercircle/p/15187184.html Current limiting Current limit is a common interview question in the interview. Why limit current In short Current limiting is used in many scenarios to limit concurrency and requests, such as second killing and rush buying, and to protect their own systems and downstream systems from ...