Build a Scala environment under Linux and write a simple Scala program

It is very simple to install Scala environment in Linux. If it is Ubuntu environment, it is even simpler. Just use apt-get to get it done. I use Ubuntu. Java/Scala system needs to be based on JDK, so JDK must be installed first.

1. Installing JDK is a commonplace and 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 the Scala shell, 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 a Scala program to test it:

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 it is necessary to know some Scala.

Summarize

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