目录一、安装不同版本的JDK二、配置环境变量（多版本JDK）1. 新建版本专用环境变量（用于切换）2. 设置主切换变量 Java_HOME3. 配置 CLASSPATH（可选但建议）4. 修改 Path 变量三、多版本切换与
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
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