linux to build scala environment and write a simple scala program

Installing the scala environment under linux is simple, and if it is ubuntu, it is even simpler and straightforward apt-get java/scala systems need to be based on jdk, so the first thing to do is to install jdk.

1. Installing jdk is a cliche. It's not worth mentioning.

2. Install scala as follows:

sudo apt-get install scala

As follows:

ubuntu@VM-0-15-ubuntu:~/taoge/scala$ scala -version
Scala code runner version 2.11.6 -- Copyright 2002-2013, LAMP/EPFL
ubuntu@VM-0-15-ubuntu:~/taoge/scala$ 

Of course, you can also use shell to enter scala, as follows:

ubuntu@VM-0-15-ubuntu:~/taoge/scala$ scala
Welcome to Scala version 2.11.6 (OpenJDK 64-Bit Server VM, Java 1.8.0_151).
Type in expressions to have them evaluated.
Type :help for more information.
scala> 

OK, let's write an scala program test:

ubuntu@VM-0-15-ubuntu:~/taoge/scala$ cat test.scala 
object HelloWorld {
  def main(args: Array[String]): Unit = {
    println("Hello, world!")
  }
}
ubuntu@VM-0-15-ubuntu:~/taoge/scala$ scala test.scala 
Hello, world!
ubuntu@VM-0-15-ubuntu:~/taoge/scala$ 

spark is written in scala, so some knowledge of scala is necessary.

conclusion