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This article is excerpted from "design patterns should be learned this way"1. Application scenario of factory method modeThe factory method mode is mainly applicable to the following application scenarios.(1) Creating objects requires a lot of repetitive code.(2) The client (application layer) does not depend on the details of how pro ...

7.9 examples Example: generate 10 random numbers, save them in the array, and find their maximum and minimum values [root@rocky8 ~]# vim max_min.sh #!/bin/bash # #********************************************************************************************** #Author: Raymond #QQ: 88563128 #Date: 2021-10-22 #FileName: ...

Implement front-end and back-end "tourism management system" based on mvc three component architecture 1. MVC three-tier architecture description 1.1. User Interface Layer, in which the User Interface Layer is used to display data and receive data input by users to provide an interface for user interaction1.2. Business Logic Layer, ...

This article is excerpted from "design patterns should be learned this way" 1. Use delegation mode to simulate task allocation scenarios We use code to simulate the business scenario where the boss assigns tasks to employees. First, create the IEmployee employee interface. public interface IEmployee { void doing(String task) ...

1: Overall architecture of Java program runtime   Java starts the JVM through the latch program, loads the class through the class loader, and first loads the metadata information of the class, including the method instructions compiled by the class. This information is first placed in the Method Area. The data in the Method area is Runtim ...

1, MMM overview 1. What is MMM   MMM (Master Master replication manager for MySQL) is a script program that supports dual master failover and dual master daily management. Mmm is developed in Perl. It mainly monitors and manages MySQL master master replication. Although it is called dual master replication, only one master is allow ...

As one of the basic functions of microservices, the registry plays an important role. Microservices divide individual services into services under different modules, and what about communication calls for services of different modules? This requires service registration and discovery. This article will use Alibaba's open source project nacos to ...

background In the project, I want to inject a field with @ Value, but I didn't expect that the injection was unsuccessful, but I can do it in another way, so I want to know the reason why the @ Value annotation was unsuccessful. The code in this article is based on Spring version 5.3.8 Simulate @ Value successful scenario First of all, in o ...

1. Disk structure 1.1 equipment documents Everything is a file: open(), read(), write(), close() Device file: associated with a device driver, which can communicate with the corresponding hardware device Equipment number: Main equipment number: major number, which identifies the equipment typeSecondary equipment number: minor number, which ...

1 what is circular dependency? As shown in the figure below: BeanA class depends on BeanB class, and BeanB class depends on BeanA class. This dependency forms a closed loop, which we call circular dependency. Similarly, see the following figure: In the above figure, BeanA class depends on BeanB class, BeanB class depends on BeanC class, an ...