添加JUnit
File > Settings > Plugins > Browse repositories > 搜索junit ,安装JunitGenerator V2
重启工具以后,在右键菜单中的Generate,会增加Junit Test的选项
JDK设置
File > Project Structure > SDKs
配色方案修改
File > Settings > Appearance > Theme > Darcular
Appearance > Override default fonts by(not recommended) > DialogInput.plain
让光标不随意定位：
File > Settings > Editor,去掉Allow placement of caret after end of line。
显示行号：
File > Settings > Editor > Appearance，勾选Show line numbers