激活码分享

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如果上面的激活码失效了，你可以在在线获取最新的激活码：https://docs.qq.com/doc/DU1VFTmZvZWRXTHZO

IDEA 缓存、索引是干嘛的？如何正确清理呢？

每次我们使用 IDEA 创建或者打开项目，IDEA 都会为项目创建索引，项目的文件越多对应的索引也就越多。

索引与缓存存在的意义就是为了加快文件查询，让你可以快速的进行文件查找、代码提示等等。

任何事物都有好坏的一面，IDEA 的索引与缓存也不例外。比如说因为电脑蓝屏或者断电这种情况，会对索引与蓝屏造成损坏，这会让 IDEA 出现一些莫名其妙的问题，比如设置被还原了、IDEA极其卡顿、项目无法正常运行等等。出现了这种情况，你就需要及时的清理缓存与索引。另外，如果你的IDEA以及其他JetBrains产品需要免费永久使用，可以收藏使用这个教程：http://www.javatiku.cn/idea/1270.html 教程通用、支持JetBrains全家桶产品。

清理缓存与索引

首先我们打开 IDEA，点击左上角的 File，再点击 Invalidate Caches...

2、点击弹框中的 Invalidate and Restart，IDEA 会清理 项目缓存并且重启 IDEA。

当然你可能只是单纯的重启 IDEA，那就点击左下角的 Just restart

我给大家解释弹框中间的三个选项，你可以选择 IDEA 在清除缓存的同时进行其他的操作：

• Claer file system cache and Local History 清除文件系统缓存和本地历史记录：删除虚拟文件系统缓存以及存储在本地历史记录中的信息。
• Clear downloaded shared indexes 下载新的共享索引之前进行确认：显示通知，提示下载新的共享索引。
• Ask before downloading new shared indexes 删除下载的共享索引。