[Design Pattern]Template Method Pattern
Template method pattern
Introduction
The template method pattern is a simple and commonly used design pattern. It is a code reuse technology based on class inheritance. Its structure only has the inheritance relationship between the base class and the derived class. A template method is a concrete method that gives a top-level logical flow fra ...
Posted by JonathanS on Sun, 22 May 2022 20:11:21 +0300
Java Basics (JavaSE) summary 07 - object oriented
Stage I: JavaSE learning 07
1. Comparison of object-oriented and process oriented ideas:
* * process oriented: * * is a process centered programming idea. Each step of realizing the function is realized by yourself
* * object oriented: * * is an object-centered programming idea, which realizes specific functions by commanding objects
Relationsh ...
Posted by barteelamar on Sun, 22 May 2022 09:05:50 +0300
Spring Security rights management system combat - 2. Implementation of logs, interface documents, etc.
Series catalog
Spring Security rights management system combat - 1. Project introduction and development environment preparation
Spring Security permission management system combat - 2. Implementation of logs, interface documents, etc.
SpringSecurity rights management system combat - three, the main page and interface implementation
SpringSecur ...
Posted by MattDunbar on Sun, 22 May 2022 07:57:28 +0300
Spring MVC + Vue project personal health information management system
Get the source code at the end
Development language: Java
Development tool: IDEA/ Eclipse
Database: mysql5 seven
Application service: Tomcat7/Tomcat8
use framessm+vue
JDK version: jdk1.0 eight
Preface introduction
System management will also carry out overall intelligent operation through computers. There are many management and ...
Posted by Daveyz83 on Sun, 22 May 2022 02:18:24 +0300
Error handling in Go multi process concurrent environment
introduction
In Go language, we usually use panic and recover to throw and catch errors. This pair of operations has no problem in a single coprocess, but in a multi coprocess, imagine the following two problems. Suppose we now have two processes:
If there is A panic in process A, will process B die because of the panic in process A?
If A pani ...
Posted by SUNNY ARSLAN on Sat, 21 May 2022 18:14:01 +0300
23 design patterns of Java -- II. Singleton pattern
The source code is in mine github and gitee Get in
introduce
Singleton Pattern is one of the simplest design patterns in Java. This type of design pattern is a creation pattern, which provides the best way to create objects.
This pattern involves a single class that is responsible for creating its own objects while ensuring that only a single o ...
Posted by Kunax on Sat, 21 May 2022 05:12:22 +0300
Invest in a milk tea shop and coffee shop (code implementation) [the web page can be modified by yourself]
catalogue
1 investment
2 coffee shop code display
2.1 ideological source
2.2? Pictures and videos
2.3 code
2.4 write at the end?
1 investment
**There is only one criterion for real investment, that is, whether it is creating real value and whether this value is beneficial to the overall prosperity of society** Adhering to this standar ...
Posted by solar_ninja on Fri, 20 May 2022 23:52:30 +0300
To understand the Volatile keyword, in fact, it is enough to read this article, which is very detailed
foreword
volatile is a lightweight synchronization mechanism provided by the Java virtual machine.
What is the role of the volatile keyword?
Two functions:
1. Ensure that the shared variable modified by volatile is visible to the total number of threads, that is, when a thread modifies the value of a shared variable modified by volatile, the ne ...
Posted by c4onastick on Fri, 20 May 2022 19:43:48 +0300
Improve Spring Boot REST API error handling
introduction
Spring Boot provides an excellent exception handling mechanism. The default implementation of ErrorController is good at catching and handling exceptions. In addition, you can also implement @ExceptionHandler yourself to catch and handle specific exceptions. However, there is room for improvement here:
Even if a custom @Exceptio ...
Posted by MattWeet on Fri, 20 May 2022 18:31:37 +0300
When deleting records logically - ensure the uniqueness of the business
catalogue
Business background
Business background
Generally, some record tables of the business system have some uniqueness constraints. For example, duplicate names are not allowed under the same user; You can usually create a unique index on the specified column, for example:
CREATE TABLE `novel`
(
`id` bigint(20 ...
Posted by JayBachatero on Fri, 20 May 2022 14:36:13 +0300