[Ubuntu >= 12.04] Install Scala Compiler


        
            
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            Installing Scala
sudo apt-get install -y scala
Create a Hello World Scala Program File
nano hello
Write a Hello World Scala Program
// scala hello

object Hello {
  def main(args: Array[String]): Unit = {
    println("Hello, world!")
  }
}
Choose OpenJDK java
sudo update-alternatives --config java
Execute the Scala Program
scala hello