How to execute scala swing application? - swing

Question

i am new for scala .and trying to execute swing application.
I am using scala 2.8
I have compiled the program successfully but..
while executing it is showing the error like no such file..
can any 1 please help me out?
i m providing the code i am trying to execute.
Gui.scala
import swing._
object Gui extends SimpleSwingApplication
{
def top=new MainFrame {
title="swing"
val b1=new Button{
text = "ok"
}
}
}
scalac Gui.scala
it compiles successfully and create class file
but when I try
scala Gui
it just replies
No such File

Answer 1

Setup:
D:\src\scala_ex\ex1>dir
Volume in drive D is Data
Volume Serial Number is 5C88-8D6C
Directory of D:\src\scala_ex\ex1
01.12.2010 09:25 <DIR> .
01.12.2010 09:25 <DIR> ..
01.12.2010 09:24 173 gui.scala
1 File(s) 173 bytes
2 Dir(s) 24 575 205 376 bytes free
D:\src\scala_ex\ex1>more gui.scala
import swing._
object Gui extends SimpleSwingApplication {
def top = new MainFrame {
title = "swing"
val b1 = new Button{
text = "ok"
}
}
}
D:\src\scala_ex\ex1>scalac -version
Scala compiler version 2.8.1.final -- Copyright 2002-2010, LAMP/EPFL
Compile:
D:\src\scala_ex\ex1>scalac gui.scala
D:\src\scala_ex\ex1>dir
Volume in drive D is Data
Volume Serial Number is 5C88-8D6C
Directory of D:\src\scala_ex\ex1
01.12.2010 09:26 <DIR> .
01.12.2010 09:26 <DIR> ..
01.12.2010 09:26 485 Gui$$anon$1$$anon$2.class
01.12.2010 09:26 557 Gui$$anon$1.class
01.12.2010 09:26 558 Gui$.class
01.12.2010 09:26 1 467 Gui.class
01.12.2010 09:24 173 gui.scala
5 File(s) 3 240 bytes
2 Dir(s) 24 575 201 280 bytes free
Execute:
D:\src\scala_ex\ex1>scala -cp . Gui
And the applications starts.

Answer 2

This is not a direct cut&paste from the Scala code, as the blank line between object Gui and { causes a compilation error.
Now, if you fix that error and compile this with Scala 2.8, you should get these classes in the local directory:
Gui$$anon$1$$anon$2.class
Gui$$anon$1.class
Gui$.class
Gui.class
If you don't, then either the compilation did not work, or there's something else missing. For example, if you declared a package X at the top (and removed it from the example), then Gui won't be in the local directory, but under a subdirectory X, and you should invoke it by typing scala X.Gui.
Another possibility is that you have some Java environment variable pointing the output directory to someplace else.