这个被埋没的宝藏就是 Apache Commons。 它就像一把 瑞士军刀，能轻松处理字符串、集合、IO 流等日常开发中最常见的“体力活”。本文将带你系统解锁它的核心功能，看看这些“老古董”如何让代码更加优雅。

The Commons Lang project's goal is to provide a uniform, tested, and documented library. Most developers have worked with a small set of utility functions, such as capitalize, stringToInt, or split.