Programmer Group

1. Simple factory mode   1.1 meaning The simple factory pattern is also called the static method pattern (because the factory class defines a static method)In real life, factories are responsible for producing products; Similarly, in the design pattern, the simple factory pattern can be understood as a class responsible for production obj ...

wait/notify wait notification method The wait notification mechanism is that the thread in the waiting state will be notified by other threads to obtain CPU resources again and continue to perform tasks that have not been completed before. The most typical example is the producer consumer model If the producer wants to add products to the q ...

Catalog Spring Configuration Data Source Role of data sources (connection pools) Steps for developing data sources   Manual creation of data sources   Spring Configuration Data Source   Extract jdbc configuration file Spring Annotation Development Spring original annotations New Spring Notes   Spring Integrated Jun ...

First interface The previous article of this project wrote how to add a background picture to the GUI interface. Now use the background of the previous article to make the first interface of the project. And I also added various listener functions to the buttons on the interface. Development tool: ideaIU-2021.1.2 Development environmen ...

1. Introduction to Spring MVC 1. What is MVC MVC is the idea of a software architecture that divides software into models, views, and controllers M:Model, the model layer, refers to the JavaBean in a project and is used to process data JavaBean s fall into two categories: A class called entity class Bean: Stores business data specifica ...

Chapter VII         Features of Java language classes 7.1 private and public members of class 7.1.1 private members If there is no mechanism to restrict access to members in a class, it is likely to cause incorrect input. To prevent this from happening, the Java language provides the access control character private. Af ...

Newly learned knowledge points (1) Get data          Obtain web page json data according to Postman (F12)   ALL    )， Stored in IDEA and formatted by Ctrl+Alt+r           Before that, you need to replace the beginning {"ret":   0   "da ...

catalogue 1. Brief 2. Development environment and tools 3. Background password encryption 3.1 encryption code 3.2 SM3 encryption class (Sm3crypto) 3.3 state secret SM3 tools (Sm3Utils) 3.4 dependence package related to state secrets 4. Login authentication 4.1 front end key codes 4.2 key codes of backend login authentication 4.2.1.SM ...

Mall infrastructure diagram: Preparation of necessary components docker installation, sql,redis Each image of docker can be regarded as loading an application on a complete and independent Linux system. instructions For more detailed instruction learning, refer to: docker Instruction Learning docker images: view the installed i ...

preface    the deadlock problem in the case of HashMap concurrency exists in jdk 1.7 and before. jdk 1.8 has been repaired by adding loHead and loTail. Although it has been repaired, if concurrency is involved, it is generally recommended to use CurrentHashMap instead of HashMap to ensure that thread safety problems will not o ...