如何从Java访问scala包对象中包含的对象Foo？ [英] How to access an object Foo contained in a scala package object from Java?

问题描述

如何从Java中访问scala包对象中包含的对象 Foo ？

How to access an object Foo contained in a scala package object from Java?

package object domain { object Foo }  domain$.MODULE$.Foo$.MODULE$ 

推荐答案

从Scala 2.8.1开始，这可能已经改变了，但建议的域$ Foo $ .MODULE $ 不起作用。你必须使用 domain.package $ Foo $ .MODULE $ 。

Perhaps this has changed as of Scala 2.8.1, but the proposed domain$Foo$.MODULE$ doesn't work. You have to use domain.package$Foo$.MODULE$.

这对象有点不同，给定scala类：

And it's a little different for objects, methods, etc. Given the scala class:

package object domain {
  object foo
  def bar = 42
  val baz = 1.0
}

您可以访问 foo ， bar 和 baz 在Java中如下：

You can access foo, bar and baz in Java like:

domain.package$foo$.MODULE$
domain.package$.MODULE$.bar()
domain.package$.MODULE$.baz()

虽然我想弄明白这一点，但我以为我们在麻烦，因为Scala生成了一个名为 package 的类，当然你无法用Java导入。幸运的是，我们只需要包$ 随附对象，您可以将其导入。

While I was trying to figure this out, I thought we were in trouble because Scala generates a class named package, which of course you can't import in Java. Fortunately, we only need the package$ companion object, which you can import.

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