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  Is Java Set ordered or not?

“Is Java Set ordered or not? ” is the most popular question asked when you interview for a Java Developer position. Many fail to answer it, and I have to admit I was one of the many. I have known the answer is “Yes and No” for a long time. No. HashSet is not ordered. Yes.TreeSet is ordered. If the interviewer continues with some follow up questions, I’m not confident that I know the answer then. Why is TreeSet ordered? Are there any other ordered S...

   ORDER,SORTEDSET,HASHSET,JAVA     2021-02-11 06:55:00

  Understand GoLang WaitGroup internals and how it works

Background Before getting into the main content, let me give a brief introduction to WaitGroup and its related background knowledge. Here, the focus is on the basic usage of WaitGroup and the fundamental knowledge of system semaphores. For those who are familiar with these, you can skip this section directly. WaitGroup WaitGroup is one of the most common concurrency control techniques in Golang, and its function can be roughly compared to the join() in concurrency control of other languages' mul...

   GOLANG,WAITGROUP,SOURCE CODE     2023-04-26 08:02:01

  Power Grid OT Simulation System

Mini OT-Energy-System Cyber Security Digital Twin Figure-00: Power_Grid_OT_Simulation_System Environment Diagram, version v0.1.2 (2024) Project Design Purpose: The primary objective of this project is to develop a scaled-down Operational Technology (OT) digital twin/equivalent — an advanced software simulation system capable of emulating the functionality of an small-sized 18KW (560+MkWh/year) hybrid power grid. This system will meet the requirements for cybersecurity training, exercises...

       2024-10-13 09:00:12

  One thought about JavaScript exception handle

Due to network, browser and cache issues, the JS executed in production may produce different results from the testing environments. Sometimes they may produce exceptions. Front-end developers may encounter this kind of exceptions frequently. But how to log and use them is seldomly considered by them. Actually, exception handling includes two steps : log and use. 1. Log Regarding to log error, this is relatively convenient, since in each browser, there is one interface called window.onerror. win...

   JaavScript,Log,Exception,Email     2013-03-18 12:50:21

  Deploying DeepSeek-R1 Locally with a Custom RAG Knowledge Data Base

Project Design Purpose : The primary goal of this article is to explore how to deploy DeepSeek-R1 an open-source large language model (LLM), and integrate it with a customized Retrieval-Augmented Generation (RAG) knowledge base on your local machine (PC/server). This setup enables the model to utilize domain-specific knowledge for expert-level responses while maintaining data privacy and customization flexibility. By doing so, users can enhance the model’s expertise in specific technical ...

   LLM,RAG,DEPLOYMENT     2025-02-10 00:17:37

  Install and configure git plugin in Eclipse

When developing using IDE, it's always a good experience if everything can be done in the IDE including development, testing and version control. This also applies to Eclipse.  In this post, we will show the process of installing and configuring git plugin in Eclipse. The pre-requisite is that you have git installed on your local machine.  The detailed steps for installing and configuring git plugin are below. 1. Installing Git plugin Install using "Install New Software..." menu. ...

   ECLIPSE,GITHUB,GIT PLUGIN     2018-10-13 04:22:06

  First impression of Github Copilot

It has been some time since I heard about the new generation of AI powered coding assistant -- Github Copilot. Don't get chance to experience it until obtained the tech preview access recently. So this post will document some first impression while using it. For now, this tool is only supported in VSCode and it can support various different programming languages. To enable it, just need to search and install the Github Copilot extension within VSCode. Once that is enabled, you will find that whe...

   GITHUB COPILOT,FIRST IMPRESSION     2021-08-13 22:45:31

  How to check when an API is introduced in GoLang

Normally people would not pay much attention to which GoLang version is being used as lots of functions are backward compatible. However there are cases where GoLang version does matter as some functions may not be supported by old version of GoLang. For example, strings.Builder is introduced in Go 1.10, but below code would fail to be compiled on Go 1.10. package main import ( "fmt" "strings" ) func main() { var b strings.Builder b.WriteString("polarisxu") fmt.Println(b.Cap()) } The ...

   GOLANG,API VERSION,GO TOOL     2021-02-07 00:43:24

  Chinese Developers Release CEC-IDE, Claimed as First Independently Developed IDE

China witnessed the recent launch of a new IDE called CEC-IDE, which boldly claims to be the first IDE independently developed by Chinese developers. Initially, this release was anticipated to be a moment of pride for the country, as it marked the availability of a homegrown IDE. However, the situation quickly took an embarrassing turn, and the entire narrative soon became a subject of ridicule. It has come to light that the so-called independently developed IDE, CEC-IDE, is actually built upon ...

   CHINA,CECIDE,CEC-IDE     2023-08-27 00:43:31

  Fix SSL 'alert protocol version' issue while git clone remote repository

Git provides ways to securely connect to remote repository and clone remote repository to local machine. This post will teach you how to fix the "SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version" issue while cloning a remote repository. The issue would look like: If this error occurs, it is most probably caused by out of date git version being used.To improve its security awareness, some weak cryptographic algorithms have been disabled and all git clients should upgrade to latest ones to acc...

   GIT,GIT CLONE,GIT SECURITY     2018-07-08 05:41:39

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