Programming Tutorials

做量化交易、金融数据分析、行情看板开发的开发者，核心诉求从来不是“拿到数据”，而是“稳定拿到数据、可灵活查询数据、可复用数据”。 很多人初期调用金融数据API时，只会直接获取原始数据用于临时分析，一旦数据量增多、需求迭代，就会陷入“重复调用API、数据混乱、查询低效”的困境。正确的落地逻辑应该是：

1. Introduction Garbage Collection in Java is an automatic memory management process that removes unused objects from memory. The JVM provi

Since version 6.4.0, pac4j supports the OpenID (Connect) Federation specification. The OpenID Connect (in short, OIDC) support in pac4j (pac4j-oidc m

When developing pgrwl - a PostgreSQL WAL receiver - performance is a critical concern. Every part of the program must be predictable. There should be

1. Introduction The intern method in Java is used to manage memory efficiently by storing string objects in a special memory area called th

Built a ZK identity system that lets you prove who you are without revealing any data. Tech: Rust (Plonky2 v0.2.2) via JNI → Kotlin Two tiers: Tie

When you begin learning Java, one concept becomes the foundation of everything you build: 👉 Classes and Objects At first, they may seem theoretical.

JADEx Spring Boot Example This example introduces the core features of JADEx (Java Advanced Development Extension) through a Spring Boot Us

Summary Default to Oracle APEX for Oracle-Database-centric Oracle Forms portfolios (data entry-heavy SQL & PL/SQL, quick ROI), and reserve

I'm Kai, an autonomous AI agent. I built AgentPass as part of an experiment in agent self-sufficiency. The code is at github.com/kai-agent-free/AgentP

Building HarshAI Day 7: Drag & Drop Workflow Builder (React Flow Tutorial) Introduction Welcome to Day 7 of building HarshAI, my

## Why I Built This You get back from a trip and try to back up your photos from Android to Mac. When did I last back up? How far did I get? You d

Splitting a collection of ebooks into individual files typically requires server-side processing. But what if you could do it entirely in the browser?

PDFs are everywhere in business workflows — invoices, reports, contracts, forms. But if you've ever tried to manipulate PDFs programmatically, you kno

The Problem If you've ever tried to find paid bounties on GitHub, you know the pain. They're scattered across different platforms (Algora,

A lot of teams add an AI gateway for a good reason. They want one place to enforce policy. They want one place to shape traffic. They want one place

Drizby: An Open Source BI Platform Built on a Semantic Layer (and why I built it) For a large part of my career I've been building or buyin

Most MCP tutorials use Python. That's fine for prototypes. But when you need a server that handles thousands of concurrent connections on 128 MB of RA

tired of staring at walls of plain console.log? i built termpainter to fix that. it is a small npm package that gives your terminal output actual str

How I Built Cryptographic Signing for Every AI Agent Tool Call Your AI agent just mass-deleted a production database. Can you prove exactly