Programmer Group

The data system in the group cannot meet the performance requirements when undertaking a business requirement, so some optimizations are made for this scenario, and an article is written here for records. The business scenario is as follows: the caller obtains hundreds of characteristics of a user at a time (characteristics can be understood a ...

Introduction well! I just gave it to you not long ago ✍ Had a bouncing ball game! Do you remember? I don't remember looking at the content of the previous issue. I upgraded this small tour with large transfer on the basis of the previous issue Play, the interface is also very simple, classic color, original, hahaha. ​ Hello everyone, I'm ...

This article is excerpted from "design patterns should be learned this way"1. Application scenario of intermediary modeIn real life, the existence of intermediaries is indispensable. Without intermediaries, we can't communicate with distant friends. Each colleague object will reference each other. If each object interacts with multipl ...

To understand the development background of Spring Boot, we have to start with the release of Spring Framework version 1.0 in 2004. However, we all use the spring framework from the beginning of learning Java, so we don't expand too much.With more and more enterprises and individuals using the Spring Framework for development, Spring has slowly ...

Article catalog What is spring MVC A long time ago, SSH was the most popular architecture mode(   Spring   Struts encapsulates servlet s   hibernate  );–> Baidu Encyclopedia SSH Framework Then came SSM(   Spring   Struts   Mybatis  ) ; Note that it's not working here yet   Spring MVC &nbs ...

Java Memory Model Thread synchronization Thread synchronization mechanism is a set of data access mechanism suitable for coordinating threads, which can ensure thread safety The thread synchronization mechanism provided by the java platform includes lock, volatile keyword, final keyword, static keyword, and related API s such as obje ...

void park(): blocks the current thread. If the unpark method is called or the current thread is interrupted, it can be returned from the park() method void park(Object blocker): the function is the same as method 1. An Object object is added to the input parameter to record the blocking objects that cause thread blocking, so as to facilitate ...

13. Look at the program and write the results class Fu{ public int num = 10; public Fu(){ System.out.println("fu"); } } class Zi extends Fu{ public int num = 20; public Zi(){ System.out.println("zi"); } public void show(){ int num = 30; System.out.println(num); System.out.println(this.num); System.out.prin ...

Our ultimate goal is to be lazy. Working together is to see you work hard, and I am lazy to enjoy. Therefore, in order to be lazy, frame programming is inevitable. In my blog in the future, I hope everyone is frame programming. Those who are irregular should be serious and diligent. We are too lazy to be worthy of you. joy:, remember that we ar ...

In the process of developing applications, the ideal state is not to have errors. Even if errors occur, they should be detected during compilation. However, in reality, errors will occur from time to time when the program runs, which will not be expected. If ignored, it will lead to program crash.In C language, the program will indicate the err ...