一、首先安装Ruby 使用 RubyInstaller 来安装 Ruby 环境，下载地址为：https:rubyinstallerdownloads下载 rubyinstaller 之后，解压到新创建的目录下：双击 rubyinst

I used Netbeans before. How do I do some refactoring (changing variable names, make method out of code,