Kotlin:当Java库同时具有原始类型和盒装类型的重载时，我该怎么办? [英] Kotlin: What can I do when a Java library has an overload of both primitive and boxed type?

问题描述

例如，FastUtil的IntArrayList具有push方法，该方法同时接受int(原始)和Integer(盒装)，但是Kotlin认为这两个都是相同的函数push(Int)，因此我不能使用完全是因为该函数是模棱两可的.

For example, FastUtil's IntArrayList has a push method that accepts both int (primitive) and Integer (boxed), but Kotlin sees these both as the same function push(Int), therefore I cannot use the function at all as the function is ambiguous.

当Java库同时具有原始类型和盒装类型的重载时，我该怎么办?

What should I do when a Java library has overloads for both the primitive and boxed type?

(ps.我知道我可以使用add(int)方法.我正在寻找如果将来遇到此类问题该怎么办.)

(p.s. I am aware that I can use the add(int) method. I am in search of what to do if I come across such a problem in the future.)

推荐答案

在Java中考虑以下方法:

Consider these methods in Java:

void f(int x) { }
void f(Integer y) { }

在科特林，他们被视为

f(x: Int)
f(x: Int!)

^{第二种方法的参数为}

^{The second method has a parameter of platform type, meaning it might be nullable, corresponding to Integer.}

第一个可以简单地通过传递的Kotlin Int来调用:

First one can be simply called with Kotlin Int passed:

f(5) // calls f(int x)

要调用第二个，可以将参数强制转换为可为空的Int?，从而选择重载:

To call the second one, you can cast the argument to nullable Int?, thus selecting the overload:

f(5 as Int?) // calls f(Integer y)

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