跟编译和性能有关 class会保留 interface不会 看一篇文章吧 [https://zhuanlan.zhihu.com/p/62443803](https://link.segmentfault.com/?enc=7moJ9W%2Fy3GdGkdSVP57iDA%3D%3D.70wXURBd7%2BFwCphLD2iVh02Ws6QFRJ31LaWorNFwjTvNWSytjewhXsK263ApSlvh)
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