将Java数组传递给Scala [英] Passing Java array to Scala

问题描述

虽然我已经使用Scala一段时间并且之前已经将它与Java混合，但我遇到了一个问题。

Although I've been using Scala for a while and have mixed it with Java before, I bumped on a problem.

如何将Java数组传递给Scala呢？我知道反过来相当简单。但Scala的Java并不是这样。

How can I pass a Java array to Scala? I know that the other way around is fairly straightforward. Java to Scala is not so however.

我应该在Scala中声明我的方法吗？

Should I declare my method in Scala?

以下是我想要实现的一个小例子：

Here is a small example of what I'm trying to achieve:

Scala：

def sumArray(ar: Array[Int]) = ...

Java：

RandomScalaClassName.sumArray(new int[]{1,2,3});

这可能吗？

推荐答案

绝对！

Scala中的 Array [T] 类已映射直接到Java类型 T [] 。它们在字节码中具有完全相同的表示。

The Array[T] class in Scala is mapped directly to the Java type T[]. They both have exactly the same representation in bytecode.

至少，这是2.8中的情况。 2.7中的情况略有不同，涉及大量的数组拳击，但理想情况下你现在应该在2.8上工作。

At least, this is the case in 2.8. Things were a little different in 2.7, with lots of array boxing involved, but ideally you should be working on 2.8 nowadays.

所以是的，它会像你一样工作写完了。

So yes, it'll work exactly as you've written it.

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