如何在 Kotlin 中使用原始类型？

Question

Kotlin automatically forces us to use wrappers like Float, Double, Int, Boolean, etc.

But sometimes, for performance and memory reasons, we need to use primitive types.

I am aware that this can be done if you use special arrays such as IntArray, DoubleArray, FloatArray, etc.

But what about single primitives in a variable?

Answer 1

Kotlin doesn't use wrapper types for non-nullable types, such as Int or Float - those will get compiled into int and float . However, if you use nullable types, such as Int? or Float? , Kotlin will use wrapper types - Integer and Float - to be able to represent null values. Using non-nullable primitive types in Kotlin will not lead to unnecessary allocations.