I'm just learning scala, and I wrote the "hello,world" program like this:
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world!")
}
}
I saved it to a file named "helloworld.scala"
Now I run it in the console:
scala helloworld.scala
But nothing outputed. I thought it will output "Hello, world". Why?
PS
If I modify the content to:
println("Hello, world")
and run again, it will output "hello,world".
if you want to run your code as a script (by using scala helloworld.scala) you have to tell scala where your main method is by adding the line
HelloWorld.main(args)
to your code
the second option you have is compiling the script by using scalac helloworld.scala
and then calling the compiled version of your class using scala HelloWorld
You have two options.
Compile and Run:
As in Java you should have a main-method as a starting point of you application. This needs to be compiled with scalac. After that the compiled class file can be started with scala ClassName
scalac helloworld.scala
scala HelloWorld
Script:
If you have a small script only, you can directly write code into a file and run it with the scala command. Then the content of that file will be wrapped automagically in a main-method.
// hello.scala, only containing this:
println("Hello, world!")
then run it:
scala hello.scala
Anyway I would recomment to compile and run. There are some things, that are not possible in a "Scalascript", which I do not remember right now.
Related
I am trying to run scala program in cmd prompt. And I get the message.
"No, such file or class on class path exists."
Things that may be relevant:
I had several warnings from Windows about downloading and running the scala executable from the site. (I ignored them all )
I had to enter a Admin Command Line to use scala, and it did not show up in my program files after install.
The installer never actually popped up for me. So I ran the executable as administration, now
it appears in my program X86 folder. and I can enter scala mode without being in Admin mode. 4. The .scala file does compile. with scalac hello.scala
The code given to me by my instructor, in a file I named hello.scala object hello extends App{ println("Hello") }
Finally, I have looked at 2 Youtube videos and 2 Stack posts before asking this question. Thank you all for your time.
Here's a complete transcript of a successful session compiling and running on this code:
% echo 'object hello extends App{ println("Hello") }' > hello.scala
% scalac hello.scala
% scala hello
Hello
Are you doing something different? If so, what is it? Show a transcript of your entire effort, including all commands you entered and all error messages you got.
I want to run python script in Scala program, I ran the python script in spark-shell, but same code I tried in Scala IDE it throws "No such file or directory".
My code in spark-shell:-
python file : a.py
scala script:-
file="a.py"
Seq("python",file) !
Above code ran successfully in spark-shell and I tried same code in Scala IDE
object newtest {
def runpython(file:String)={
Seq("python",file) !
}
def main(args: Array[String]):Unit={
val file="/sample/a.py"
runpython(file)
}
}
note:- "/sample" is project folder in scala IDE
Please help me on this.
Thanks,
Prasad.
I would guess that the missing file is python.
try setting the full path of the python executable
I'm using Intellij-idea for scala programming (with sbt plugin).
I want to know what is the difference between scala classes, scala scripts and scala worksheets. When we use each of them?
This will be very nice if you can explain it by a simple example.
Thanks
You have different ways of running scala code:
First create a Program with your classes, this is as in java, I use object because it works well without instantianing, like static, just compile with the SBT and run it you can also use the scala Interpreter REPL
We can use this object in the REPL
scala> object Hello {
| def main(args:Array[String]) {
| println("Hello, Scala !!")
| }
| }
defined object Hello
scala> Hello.main(Array("onlyforwork"))
Hello, Scala !!
compiling and running it using activator/SBT
> compile
[info] Compiling 1 Scala source to /home/anquegi/Dev/StackOverFlow/scalaStack/target/scala-2.11/classes...
[success] Total time: 2 s, completed 13/04/2015 11:29:42
> run
[warn] Multiple main classes detected. Run 'show discoveredMainClasses' to see the list
Multiple main classes detected, select one to run:
[1] org.example.Hello
[2] org.example.ScheduledTaskScala
[3] question1.Ques
[4] scriptworksheet.Hello
Enter number: 4
[info] Running scriptworksheet.Hello
Hello, Scala !!
[success] Total time: 19 s, completed 13/04/2015 11:30:04
The second is that if we add the scala code as a script or file Hello.scala, You can save your scala code in the file with .scala extension (basically with any file extension but prefered .scala extension) and to run, provide file name with extension as parameter to scala interpreter
/**
* Created by anquegi on 13/04/15.
*/
println("Hello, Scala !!")
if we call the scala interpreter this file is executed, you do not need to instanciate objects or clases, just executing like a shell script, you can also execute directlyy from Intellij, but I use the console with scala installed on the system
[anquegi#localhost scalaStack]$ scala src/main/scala/scriptworksheet/HelloScript.scala
Hello, Scala !!
And finally the worksheet is the most powerfull, I recommend this for increasing your prodductivity at work bacause it is easy to test things is like the REPL, ant it evluates the scala exprssions and shows you back the result
Following is excerpt from official github repo wiki about the scala worksheet
A worksheet is a Scala file that is evaluated on save, and the result of each expression is shown in a column to the right of your program. Worksheets are like a REPL session on steroids, and enjoy 1st class editor support: completion, hyperlinking, interactive errors-as-you-type, auto-format, etc.
// We can define objects or classes and the worksheet
//will print the sesult of every expression
object Hello {
def main(args:Array[String]) {
println("Hello, Scala !!")
}
}
println("Hello Scala")
val a = 4 + 5
the result
defined module Hello
Hello Scala
res0: Unit = ()
a: Int = 9
then a capture that shows you working with classe the work sheet and the console for scriptsin the Intellij
Scala Worksheet
It's the same as Scala Interpreter (REPL) but runs inside IntelliJ. Where you may easily and quickly evaluate some expressions. Check IntelliJ confluence page for more information.
Scala Script
If you don't want write script on Bash you can do it with Scala. It's just sequence of Scala statements.
Example:
import java.nio.file.{Paths, Files}
val ScalaSource = "*.scala"
val Path = "path/to/necessary/folder"
val stream = Files.newDirectoryStream(Paths.get(Path), ScalaSource)
val paths = stream.iterator
while (paths.hasNext) {
println(paths.next.getFileName)
}
Running it:
$ scala scala_script_name.scala
To getting started pick up this guide.
Classes & Object
Short answer for Scala classes it's similar to POJO and Scala Objects it's a Java Singleton class.
I'm a newbie in scala. I recently started using netbeans for writing scala programs.I have installed scala version 2.11.0.400 and its plugins for netbeans.When I try to compile my scala code:-
package scalaapplication2
object Main {
def main(args: Array[String]): Unit=
{
println("Hello, world!")
}
}
I get the following compilation error even after setting the path variables:-
Compiling 1 source file to C:\Users\Nitin\Documents\NetBeansProject\ScalaApplication2\build\classes
C:\Users\Nitin\Documents\NetBeansProjects\ScalaApplication2\nbproject\build- impl.xml:423:
The following error occurred while executing this line:
C:\Users\Nitin\Documents\NetBeansProjects\ScalaApplication2\nbproject\build-impl.xml:238: bad option: '-make:transitive'
Why is it so?
Removing '-make:transitive' from the scalac addparams option (Files view > ScalaApplication > nbproject > build-impl.xml) worked for me.
I am learning Scala so bear with me if this is a stupid question.
I have this package and a class (teared it down to most simplistic version):
package Foo {
class Bar {}
}
then in main.scala file I have:
import Foo.Bar
object test {
def main() {
val b = new Bar()
}
}
Why am I getting this:
test.scala:1: error: Bar is not a member of Foo
It points at the import statement.
scalac is the scala compiler. Foo.bar needs to have been compiled for you to use it, so you can't just run your main.scala as a script.
The other mistake in your code is that the main method needs to be
def main(args: Array[String]) { ...
(or you could have test extends App instead and do away with the main method).
I can confirm if you put the two files above in an empty directory (with the correction on the main method signature) and run scalac * followed by scala test it runs correctly.
The most likely explanation is that you did not compile the first file, or you are doing something wrong when compiling. Let's say both files are in the current directory, then this should work:
scalac *.scala
It should generate some class files in the current directory, as well as a Bar.class file in the Foo directory, which it will create.
To quickly test a scala code in IntelliJ (with the Scala plugin), you can simply type Ctrl+Shift+F10:
Note that for testing a Scala class, you have other choices, also supported in IntelliJ:
JUnit or TestNG
ScalaTest