Scala 伴生类警告 [英] Scala companion class warning

问题描述

我是 Scala 编程的新手，有人可以在警告原因下面解释我吗?

I am new to Scala programming, can someone explain me below warning reason?

我试图找到原因，它似乎更早修复了:https://issues.scala-lang.org/browse/SI-6439

I tried to find the reason and it seems like a big fixed earlier: https://issues.scala-lang.org/browse/SI-6439

那为什么我会收到这个警告?

So why I am getting this warning?

推荐答案

这是特定于 REPL(读取评估打印循环)的，因为它无法知道用户输入何时结束.

This is specific to the REPL (Read Evaluate Print Loop), since it can't know when user input ends.

使用 :paste 绕过它:

scala> class A {}
defined class A

scala> object A {}
defined object A
warning: previously defined class A is not a companion to object A.
Companions must be defined together; you may wish to use :paste mode for this.

scala> :paste
// Entering paste mode (ctrl-D to finish)

class A {}
object A {}

// Exiting paste mode, now interpreting.

defined class A
defined object A

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