1、下载地址
https://www.jetbrains.com/idea/download/#section=windows
2、注册码
使用方法
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3、基本操作
https://blog.csdn.net/qq_31655965/article/details/52788374
4、遇到问题
<1>java 无效源版本 11
错误原因：Project Language Level与当前JDK版本不匹配（大概率是因为IDEA默认JDK版本高于当前项目的JDK版本）
解决：File >> Project Structure >> Project >> Project Language Level
切换为SDK default
