Hutool 3.9 Upd ((link)) -

The 3.9 update introduced several performance improvements and architectural changes to keep the library efficient:

: Includes tools for generating "Navigation Map Update" (FSC) codes. USB Coding & Activations Hutool 3.9 UPD

Hutool 3.9 UPD an update for a specialized BMW coding and diagnostic software tool Hutool 3

Part 10: Code Examples – The Ultimate Cheat Sheet for 3.9 UPD

Other Modules

: Includes JSON, HTTP client, JDBC, and string manipulation ( StrUtil ). Context for Version 3.9 tighter java.time integration

• blankToDefault – Replaces null/blank/empty string with a default.
• hide – Masks strings (e.g., StrUtil.hide("13800138000", 3, 7) returns 138****8000).
• subByCodePoint – Safe substring for emojis and Unicode characters (avoiding the dreaded 🔨💻.substring(1) crash).

Hutool 3.9 delivers incremental improvements: more robust HTTP and Excel support, tighter java.time integration, performance fixes, and small API cleanups. Upgrade with normal caution—run tests and validate key flows (HTTP, Excel, JSON) — and follow migration notes for deprecated APIs.