CODEWITHSUNDEEP
scala
user137392
user137392

Reputation: 11

Running Scala script with statement outside object

The contents of myfile.scala are as follows :

//  println("print this line")

object myObj  {
        def main(args: Array[String]): Unit = {
                println("Hello, world!")
        }
}

If I run : scala myfile.scala, it prints : Hello, world

If I uncomment the first println stmt, and run : scala myfile.scala, it only prints : print this line , and does not print hello-world stmt.

Why is this so? I find it very confusing. I tried to search the archives, but could not find any answers.

Upvotes: 0

Views: 212

Answers (1)

puhlen
puhlen

Reputation: 8529

When the scala command sees a top level statement (not in a class or object) in the file, it runs the file as a script, starting at the first line and moving down. You main method never gets called because you never call it, just define it. When your file doesn't contain any top level statements but it does contain a main object, it will run the main method as the entry point to the program.

Upvotes: 4

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