function - 在 Scala 中从其他类导入函数

Question

比如说我有

class foo{
  def bar = 7
}

class qaz{
  //Here I want to have something like: val foobar = bar
  //What I don't want to have is val foobar = (new foo).bar   
}

我怎样才能做到这一点？

Answer 1

您可以使用 foo 的伴生对象定义 bar .

然后你可以简单地将它导入 qaz :

// in foo.scala
object foo {
  def bar = 7
}
class foo {
  // whatever for foo class
}

// in qaz.scala
import mypackage.foo.bar
class qaz {
  val foobar = bar     // it works!
}