目录前言场景一、场景二、场景三、前言 Optional类是JDK8引入的一个新类。在这之前，Java在变量、对象、集合的判空处理上并不优雅。本篇博客以实际业务场景为例梳理Optional类在实际业务场景中如何优雅地判空，并不会
I\'m a desktop application developer, and I plan learning html5, but as it\'s not released, there are (almost) no published books and not too much infomation for beginners on the web... I feel I shoul
加载中,请稍侯......