Install IntelliJ IDEA Community Edition and Write Hello Kotlin Program

To write Kotlin program you will need an IDE (Integrated Development Environment). One of the IDE that you can use is the IntelliJ IDEA CE (Community Edition). It comes with Kotlin Java Runtime Library so you don’t need to install it separately.

To run Kotlin program you will need to install the latest JDK (Java Development Kit) which can be downloaded freely from the Java Download Website. Download version for your operating system and run the installer.

To check if Java successfully installed you can type the following command in your terminal or command prompt:

java -version

If you see something this then Java Development Kit is installed in your system.

java version "10" 2018-03-20
Java(TM) SE Runtime Environment 18.3 (build 10+46)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)

After installing the JDK you can download the IntelliJ IDEA CE. Double click the installer to install it. For more details on installation and setup you can checkout this website.

Now let’s create our first simple Kotlin program in IntelliJ IDEA.

  • Open the IntelliJ IDEA CE and click the Create New Project from the Welcome Screen dialog.
Create New Kotlin Project

Create New Kotlin Project

  • On the New Project dialog choose Kotlin from the left sidebar and then choose Kotlin/JVM in the selection on the right sidebar. Press the Next button.
New Kotlin Project Setup

New Kotlin Project Setup

  • Enter the project name Hello Kotlin, the project location path and the JDK will be used in the project.
New Kotlin Project Configurations

New Kotlin Project Configurations

  • Click the Finish button to create the project. It will bring you to the following screen.
HelloKotlin Project in IntelliJ IDEA CE

HelloKotlin Project in IntelliJ IDEA CE

  • Right click on the src directory and choose NewKotlin File/Class from the menu. Enter HelloKotlin in the File/Class name.
New Kotlin File/Class Dialog

New Kotlin File/Class Dialog

  • In the HelloKotlin.kt type in the following code snippet.
fun main(args: Array<String>) {
    if (args.isEmpty()) {
        println("Hello, World!")
        return
    } else {
        println("Hi, hello ${args[0]}!")
    }
}
  • To run it, right click on the editor and choose the Run HelloKotlinKt from the menu.
  • If you want to run it with an argument you can set it in the Run/Debug Configurations dialog.
  • To open the Run/Debug Configurations click the down-arrow button next to HelloKotlinKt in the navigation bar on the top-right and choose Edit Configurations…
  • Type in the arguments in the Program arguments textbox.
Run/Debug Configurations

Run/Debug Configurations

That’s all. Now you have your JDK, IntelliJ IDEA CE installed and created your first Kotlin program. If you have any questions please post it in the comments section below. Thank you and have fun with Kotlin.

Wayan

Programmer, runner, recreational diver, live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA.

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