Java enumeration classes and annotations
classification
Custom class enumerationImplementation using enum keyword
Custom enumeration class code
Constructor privatization to prevent direct newRemove the set related method to prevent the property from being modifiedCreate fixed objects directly in SeasonTo prevent the static method of the class from being loaded every time the pr ...
Posted by BooRadLey on Sun, 21 Aug 2022 09:29:12 +0300
Design pattern of java learning - prototype pattern
Prototype mode
summary
Use an already created instance as a prototype, and create a new object that is the same as the prototype object by copying the prototype object.
structure
The prototype pattern includes the following roles:
Abstract prototype class: Specifies the clone() method that the concrete prototype object must implement.Concr ...
Posted by rallan on Sat, 20 Aug 2022 17:39:28 +0300
Design mode for java learning - Builder mode
Builder pattern
Summary
Separating the construction of a complex object from its representation allows the same construction process to create different representations.
Separate the components for construction (Builder responsible) and assembly (Director responsible). Thus complex objects can be constructed. This pattern applies when the c ...
Posted by konn on Fri, 19 Aug 2022 23:29:58 +0300
Youwei low code: Transform data conversion
Introduction
The low code technology column of Youwei is a brand-new and technology-based column written by the members of Youwei Technology Committee. Based on the research and development and operation and maintenance achievements of low code technology of Youwei in the past 7 years, it mainly introduces the technical principles and arch ...
Posted by bhola on Tue, 16 Aug 2022 12:30:16 +0300
Some questions and understandings about bit operation
Some questions and understandings about bit operation
1. What is the first bit operation?
2. What can bit operations do?
3. Why use bit operations instead of other operations?
4. Since the operation in place is used, how to use its operators and what is the application scenario?
For the above personal questions, I surf and read books to co ...
Posted by kailien on Tue, 16 Aug 2022 10:00:17 +0300
Introduction and use of Eureka
catalogue
Introduction to Eureka
Spring Cloud introduces Eureka
1. Create cloud Eureka server7001 subproject
Dependency needs to be introduced (indicates eureka server):
Write yml:
For main startup, add the annotation @EnableEurekaServer
2.The cloud-consumer-order80 of Eureka client will register into Eureka server and become a consume ...
Posted by stig1 on Sat, 13 Aug 2022 21:17:34 +0300
JVM memory structure
JVM introduction
1. What is a JVM?
java virtual machine - the running environment of java programs (java Binary Bytecode operating environment)
2. Benefits of JVM
The cornerstone of writing once and running everywhere [key]Automatic memory management, garbage collection function [key]Data subscript out of range checkPolymorphism, object-ori ...
Posted by mike0193 on Fri, 12 Aug 2022 21:44:05 +0300
Mysql data backup and recovery
foreword
After reading this article, delete the library and run away! ? It can never happen again! Be sure to develop the habit of risky operation of backup data to avoid wasting time in restoring data.
Contents of this article:
The role of binlog
mysqldump and mysqlbinlog do data backup and data recovery.
XtraBackup full backup and increment ...
Posted by Revan on Thu, 11 Aug 2022 21:16:22 +0300
Refactoring: reorganizing functions
1, Put a piece of code into a separate function
1.1 code example
1.2 application scenarios
When there is an overly long function or a piece of code that needs comments to make people understand its purpose, put this code into a separate function.
1.3 benefits
First, there is a greater chance that functions can be reused with each ...
Posted by TheIceman5 on Wed, 10 Aug 2022 21:29:37 +0300
Java object orientation: the ultimate training of interfaces
Problem description
There are four roles as follows. The attributes and behaviors of these roles are
Stock investors: name, age, study stock speculation, speak English
Fund Investor: name, age, study and speculation
Stock Manager: name, age, teaching stock trading, speaking English
Fund manager: name, age, teaching and speculation base
Pl ...
Posted by ballhogjoni on Tue, 09 Aug 2022 21:47:12 +0300