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2019-11-27：谈谈Kotlin中的Unit？它和Java中的void有什么区别？ #198

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Moosphan opened this issue Nov 27, 2019 · 1 comment

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Moosphan commented Nov 27, 2019

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Moosphan added the Kotlin label

feelschaotic commented Dec 24, 2019 •

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同：

两者概念相似

异：

Unit 是一个类，继承自 Any 类，单例（目的在于函数返回 Unit 时避免分配内存）
正因为 Unit 是一个普通的对象（这里指用 object 关键字定义的单例类型），所以可以调用它的 toString() 方法：结果一定是 "Kotlin.Unit"（源代码写死了）

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