Programmer Group

Reference link: https://my.oschina.net/sdlvzg/blog/1590946 Reference link: https://blog.csdn.net/chengqiuming/article/details/83684952 1. What is the Future type? Future is the interface for canceling the execution result of a specific Runnable or Callable task, querying whether it is completed, and obtaining the result. If nece ...

1: Basic concepts of spring 1) Struts 2 is web framework, hibernate is orm framework 2) spring is a container framework, which creates beans and maintains the relationship between beans 3) Spring can manage the web layer, persistence layer, business layer, dao layer, spring can configure the components of each layer, and maintain the relati ...

Rookie tutorial - C structure The C array allows you to define variables that can store items of the same type, Structure is another user-defined available data type in C programming, It allows you to store different types of data items. Structure is used to represent a record, If you want to track the ...

catalog introduction AOP overview AOP terminology Understanding of hands through practice (simple calculator) introduction What is AOP? (interview question), simply answering face-to-face programming can't satisfy the interviewer, it's better to combine your own understanding. AOP overview ...

OAuth2 and our little buddies have talked a lot. Let's practice with a practical case. Here I use GitHub for third-party login. Why GitHub?There are two considerations: Programmers basically have GitHub accounts for easy testing. In China, no matter QQ, WeChat, Weibo, etc., registration and auditing are required, which takes a lot of t ...

summary The Spring framework provides a perfect event monitoring mechanism. The steps to implement event monitoring in the Spring framework are as follows: Custom events, inheriting org.springframework.context.ApplicationEvent abstract class Define event listener, implement org.springframework.contex ...

Before the flow chart was drawn, tomcat was used to start the flow modeler, but in this way, the data in your system cannot be queried when assigning task users / user groups. So now we need to integrate the flowable modeler into the project. I searched a lot of articles before, but I didn't feel very clear. Maybe it was because I just got ...

Task description Task: please write code to draw bar chart of average selling price of all kinds of commercial housing. Relevant knowledge In order to complete this task, you need to master the drawing of stacked (parallel) histogram. Draw stacked bar The bar function is called as follows: mat ...

Summary Many people come into contact with Python from crawlers. In fact, many languages can be crawlers, but Python is simpler than other languages.But Python is more than just a crawler; it is more widely used in artificial intelligence, scientific computing, and so on.Ancient Cloud: Wan Zhang Tall Building rises flat, in order to have consid ...

Let's face it, enum (enumeration) is a keyword introduced in Java 1.5. It represents a special type of class. By default inherit From java.lang.Enum . To prove this, let's create a new enumeration player type: public enum PlayerType { TENNIS, FOOTBALL, BASKETBALL } There are two keywords w ...