trait 和abstract的区别在哪里、
感觉没区别呢，实在没想出来在那种场景下会有区别
回复内容：
感觉没区别呢，实在没想出来在那种场景下会有区别
无法在一个class上extend多个abstract class，但是你可以use多个trait
abstract class是在类型系统上做文章，trait片段是mixin
| 类型约束 | 代码复用 | |
| class | 是 | 是 |
| interface | 是 | 否 |
| trait | 否 | 是 |
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