Scala - Environment Setup


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Try it Option Online

We have set up the Scala Programming environment on-line, so that you can compile and execute all the available examples on line. It gives you confidence in what you are reading and enables you to verify the programs with different options. Feel free to modify any example and execute it on-line.

Try the following example using our on-line compiler available at CodingGround.

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

For most of the examples given in this tutorial, you will find a Try it option in our website code sections at the top right corner that will take you to the online compiler. So just make use of it and enjoy your learning.

Scala can be installed on any UNIX flavored or Windows based system. Before you start installing Scala on your machine, you must have Java 1.8 or greater installed on your computer.

Follow the steps given below to install Scala.

Step 1: Verify Your Java Installation

First of all, you need to have Java Software Development Kit (SDK) installed on your system. To verify this, execute any of the following two commands depending on the platform you are working on.

If the Java installation has been done properly, then it will display the current version and specification of your Java installation. A sample output is given in the following table.

Platform Command Sample Output
Windows

Open Command Console and type −

\>java –version

Java version "1.8.0_31"

Java (TM) SE Run Time

Environment (build 1.8.0_31-b31)

Java Hotspot (TM) 64-bit Server

VM (build 25.31-b07, mixed mode)

Linux

Open Command terminal and type −

$java –version

Java version "1.8.0_31"

Open JDK Runtime Environment (rhel-2.8.10.4.el6_4-x86_64)

Open JDK 64-Bit Server VM (build 25.31-b07, mixed mode)

We assume that the readers of this tutorial have Java SDK version 1.8.0_31 installed on their system.

In case you do not have Java SDK, download its current version from http://www.oracle.com/technetwork/java/javase/downloads/index.html and install it.

Step 2: Set Your Java Environment

Set the environment variable JAVA_HOME to point to the base directory location where Java is installed on your machine. For example,

Sr.No Platform & Description
1

Windows

Set JAVA_HOME to C:\ProgramFiles\java\jdk1.7.0_60

2

Linux

Export JAVA_HOME=/usr/local/java-current

Append the full path of Java compiler location to the System Path.

Sr.No Platform & Description
1

Windows

Append the String "C:\Program Files\Java\jdk1.7.0_60\bin" to the end of the system variable PATH.

2

Linux

Export PATH=$PATH:$JAVA_HOME/bin/

Execute the command java -version from the command prompt as explained above.

Step 3: Install Scala

You can download Scala from http://www.scala-lang.org/downloads. At the time of writing this tutorial, I downloaded ‘scala-2.11.5-installer.jar’. Make sure you have admin privilege to proceed. Now, execute the following command at the command prompt −

Platform Command & Output Description
Windows

\>java –jar scala-2.11.5-installer.jar\>

This command will display an installation wizard, which will guide you to install Scala on your windows machine. During installation, it will ask for license agreement, simply accept it and further it will ask a path where Scala will be installed. I selected default given path “C:\Program Files\Scala”, you can select a suitable path as per your convenience.

Linux

Command

$java –jar scala-2.9.0.1-installer.jar

Output

Welcome to the installation of Scala 2.9.0.1!

The homepage is at − http://Scala-lang.org/

press 1 to continue, 2 to quit, 3 to redisplay

1................................................

[ Starting to unpack ]

[ Processing package: Software Package Installation (1/1) ]

[ Unpacking finished ]

[ Console installation done ]

During installation, it will ask for license agreement, to accept it type 1 and it will ask a path where Scala will be installed. I entered /usr/local/share, you can select a suitable path as per your convenience.

Finally, open a new command prompt and type Scala -version and press Enter. You should see the following −

Platform Command Output
Windows

\>scala -version

Scala code runner version 2.11.5 -- Copyright 2002-2013, LAMP/EPFL

Linux

$scala -version

Scala code runner version 2.9.0.1 – Copyright 2002-2013, LAMP/EPFL



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