Scala - Environment Setup

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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.

Example

For Windows

C:\Windows\System32>java --version

This will be the output, if Java is installed on your computer −

Microsoft Windows [Version 10.0.22621.2283]
(c) Microsoft Corporation. All rights reserved.

C:\Windows\System32>java --version
java 21.0.1 2023-10-17 LTS
Java(TM) SE Runtime Environment (build 21.0.1+12-LTS-29)
Java HotSpot(TM) 64-Bit Server VM (build 21.0.1+12-LTS-29, mixed mode, sharing)

C:\Windows\System32>
Java Version Installed

For Linux

$ java -version

This will be the output, if Java is installed on your computer −

java version "11.0.11"
Java(TM) SE Runtime Environment (build 11.0.11+9-LTS)
Java HotSpot(TM) 64-Bit Server VM (build 11.0.11+9-LTS, mixed mode)

If the Java installation has been done properly, it will display the current version and specification of your Java installation. If Java is not already installed on your computer, then there will be an error message.

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.

For example, in Windows −

Scala Version Installed

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

For example, in Windows −

C:\Windows\System32>scala --version
Scala code runner version 3.3.1 -- Copyright 2002-2023, LAMP/EPFL

C:\Windows\System32>
Scala Version Windows

Testing and Running Scala using Commands

You can open cmd and run these commands to execute them. For example, in Windows −

Microsoft Windows [Version 10.0.22621.2283]
(c) Microsoft Corporation. All rights reserved.

C:\Users\Jai Shree Mithlesh>scala --version
Scala code runner version 3.3.1 -- Copyright 2002-2023, LAMP/EPFL

C:\Users\Jai Shree Mithlesh>scala
Welcome to Scala 3.3.1 (21.0.1, Java Java HotSpot(TM) 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.

scala> println("Hello, tutorialspoint")
Hello, tutorialspoint

scala> 4+5
val res0: Int = 9

scala> 10/6
val res1: Int = 1

scala>

Note that you can also use Scala on various IDEs, like IntelliJ and VSCode with metals.

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