Your First Kotlin Program

Introduction

Now that you have set up your Kotlin development environment, the next step is to create a new Kotlin project and write your first Kotlin program. This chapter will guide you through creating a Kotlin project in IntelliJ IDEA and writing a simple Kotlin program.

Step 1: Create a New Kotlin Project in IntelliJ IDEA

1. Start IntelliJ IDEA:
   • Open IntelliJ IDEA.
   • If this is your first time, you may need to configure initial settings.
2. Create a New Project:
   • Click on “New Project”.
   • Select “Kotlin” from the left-hand menu.
   • Choose “Kotlin/JVM” as the project type.
3. Configure Project Settings:
   • Enter the project name and location.
   • Ensure the “Project SDK” is set to the JDK you installed earlier.
   • Click “Finish” to create the project.

Step 2: Write Your First Kotlin Program

1. Create a New Kotlin File:
   • Right-click on the src folder in the Project view.
   • Select “New” -> “Kotlin File/Class”.
   • Enter a name for your Kotlin file and select “File”.
   • Click “OK”.
2. Write a Simple Kotlin Program:
   • Open the newly created Kotlin file.
   • Write a simple Kotlin program:

     fun main() {
         println("Hello, Kotlin!")
     }
     

3. Run the Program:
   • Click the green run icon next to the main function or right-click in the editor and select “Run ‘Main'”.
   • The output “Hello, Kotlin!” should appear in the Run window.

Conclusion

By following these steps, you have created your first Kotlin project and written a simple Kotlin program. This is your first step into Kotlin development. In the next chapter, you will understand the structure of this simple Hello World Kotlin program like you will understand the basic components and syntax of a Kotlin program.