1、idea编辑器 - 显示代码行数
Settings -> Editor -> General -> Appearance ->show line numbers
2、idea编辑器 - 显示代码右边线
Setting -> Editor -> General -> Appearance -> Show right margin
Settings -> Editor -> General -> Appearance ->show line numbers
2、idea编辑器 - 显示代码右边线
Setting -> Editor -> General -> Appearance -> Show right margin