[Design Pattern]Mediator Pattern

[Design Pattern]Intermediary Pattern 1 Overview background Generally speaking, the relationship between colleague classes is relatively complex. When multiple colleague classes are related to each other, the relationship between them will appear as a complex network structure, which is an over-coupled architecture, that is, no It is cond ...

Posted by videxx on Tue, 20 Sep 2022 21:16:55 +0300

HashMap's 7 traversal methods and performance analysis!

In general, HashMap traversal can be divided into the following four categories: Iterator mode traversal;For Each traversal;Lambda expression traversal (JDK 1.8+);Streams API traversal (JDK 1.8+). However, each type has different implementation methods, so the specific traversal methods can be divided into the following 7 types: 1. Use Itera ...

Posted by bookbuyer2000 on Mon, 19 Sep 2022 21:21:02 +0300

In-depth rich text editor

Editor introduction Common rich text editors can be divided into two categories, which are implemented by textarea and contenteditable. textarea The structure is simple and easy to use. Some text formats and complex styles are difficult to implement. It is recommended to be used only in scenarios with low editing requirements. contenteditab ...

Posted by jcornett on Mon, 19 Sep 2022 21:14:08 +0300

File upload and download in Java (based on FTP protocol)

Role of FTP Server FTP servers (File Transfer Protocol Servers) are computers that provide file storage and access services over the Internet. They provide services according to the FTP protocol. FTP servers are often used for file sharing and transmission and are an essential part of the Internet. Our file upload and download function is the ...

Posted by Liquix on Mon, 19 Sep 2022 21:02:52 +0300

Detailed description of dock command

install https://docs.docker.com/engine/install/ Just install ce (community version) Start command Start docker systemctl start docker Close docker systemctl stop docker Restart docker systemctl restart docker docker settings start automatically when the service starts systemctl enable docker View Status View docker Running Sta ...

Posted by wata on Sun, 18 Sep 2022 21:43:12 +0300

Java Collection Framework System - The whole system of Collection and Map from practicality, comparison to underlying analysis

Java Collection Framework System Summary Notice: This article cites a large number of high-quality articles, and some of the applied ones have links to directly view the in-depth analysis of knowledge points.As for the content involving the code section, it is presented in the form of Demo + annotations. Demo mainly involves basic and common ...

Posted by mrobertson on Sun, 18 Sep 2022 21:24:48 +0300

Java advanced programming class set framework (collection class)

Introduction to the Class Set Framework     In actual development, no development can leave the array, but the traditional array is very cumbersome to use, and the length is its fatal flaw. Officially, due to the length problem, it is impossible to use it on a large scale, but it is far from being used during development. Without arrays, we ca ...

Posted by cmgmyr on Sun, 18 Sep 2022 21:19:40 +0300

OpenWrt skips tools compilation

OpenWrt skips tools compilation foreword It is still time-consuming for OpenWrt to compile tools, so in order to shorten the compilation time, we try to use the compiled tools in the SDK provided by OpenWrt. Analyze the code When analyzing the OpenWrt source code, the more you analyze, the more code you see, and the more knowledge y ...

Posted by netdog on Sat, 17 Sep 2022 21:56:47 +0300

Weblogic Series Vulnerability Recurrence

#Disclaimer: This is a personal note, which is only for learning. It is prohibited to use it for any illegal act. Any illegal act has nothing to do with me. Weblogic XMLDecoder Deserialization Vulnerability (CVE-2017-10271) Vulnerability Overview Vulnerability No.: CVE-2017-10271 Vulnerability impact: wls wsat XMLDecoder deserialization vu ...

Posted by chelsea7 on Sat, 17 Sep 2022 21:36:21 +0300

R language - data structures

Dataset Concept Different industries call the rows and columns of a dataset differently. Statisticians call them observation s and variable s, database analysts call them record s and field s, and researchers in data mining and machine learning disciplines call them example s ) and attribute s. data structure R has many object types for stor ...

Posted by harishkumar09 on Sat, 17 Sep 2022 21:36:31 +0300