Scala can't import a class that Java can

Question

Why I can do this in Java:

import javax.swing.GroupLayout.Group;

but if I do the same in Scala (by using Ammonite), I get this:

value Group is not a member of object javax.swing.GroupLayout possible cause: maybe a semicolon is missing before `value Group'? import javax.swing.GroupLayout.Group

Is it due to the fact that Group is a public class derived from a private class called Spring?.

I can import neither SequentialGroup nor ParallelGroup.

Is it a bug in Scala? I'm using Java 11 and Scala 2.12.10.

Scala 2.13.1 also fails. :-(

I need the import, for defining a generic method that can have a Group parameter, that could be either a ParallelGroup or a SequentialGroup.

I think what might help find an answer is that Scala specfically cannot import an inner Java class. Do either of these references help? stackoverflow.com/questions/42322033/… stackoverflow.com/questions/52132456/… — Freiheit
– Freiheit, Commented Feb 10, 2020 at 15:59
I think the usage should be something like val gl = new javax.swing.GroupLayout(new Container()) and then gl.createParallelGroup() or gl.createSequentialGroup() — mfirry
– mfirry, Commented Feb 10, 2020 at 16:00
But I'd like to generate a generic method that takes as a parameter a Group, that could be either a ParallelGroup or a SequientialGroup. — david.perez
– david.perez, Commented Feb 10, 2020 at 16:04

Alexey Romanov · Accepted Answer · 2020-02-10 16:14:49Z

4

I'd like to generate a generic method that takes as a parameter a Group, that could be either a ParallelGroup or a SequientialGroup

That would be a type projection

def method(group: GroupLayout#Group) = ...

or if you also have the layout the group belongs to,

def method(layout: GroupLayout)(group: layout.Group) = ...

or

val layout: GroupLayout = ...
def method(group: layout.Group) = ...

answered Feb 10, 2020 at 16:14

Alexey Romanov

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