CODEWITHSUNDEEP
scalapackage
ajduke
ajduke

Reputation: 5057

Calling a function from a different class from different package

I have the following scala file, test.scala

package p1 {
    object ty {
       def f() = print ("p1.ty.f")
    }
}

package p2  {
    object ty extends App {
       def f() = println (" in p2.ty.f , in " + p1.ty.f ) 
        // calls above function 
        ty.f
    }
}

when I am trying to run the above code using sbt (with p2.ty on command line) it outputs the following:

p1.ty.f in p2.ty.f , in ()

while I expect the following :

in p2.ty.f , in  p1.ty.f

What causes this behavior - am I missing something?

Upvotes: 0

Views: 3352

Answers (1)

tenshi
tenshi

Reputation: 26566

p1.ty.f does not return anything (it actually returns Unit) so it does not make sense to concatenate the result of this function with another string " in p2.ty.f , in " + p1.ty.f. So as result, print ("p1.ty.f") would be executed first and will print p1.ty.f and then println (" in p2.ty.f , in " + p1.ty.f ) would be executed and will print in p2.ty.f , in () because () is a string representation of Unit.

So to achieve the desired result you need to write something like this:

package p1 {
  object ty {
    def f() = "p1.ty.f"
  }
}

package p2  {
  object ty extends App {
    def f() = println (" in p2.ty.f , in " + p1.ty.f() )
    ty.f()
  }
}

Upvotes: 1

Related Questions