Kotlin Main Function - fun main(args: Array) Examples

A quick guide to main function in kotlin. fun main() method examples, fun main(args: Array) and fun main() programs.

1. Introduction

In this article, You'll learn how to create the main() method in kotlin. This is also called a fun main() method.

2. fun main() Examples - Main Function

the main() method in kotlin can be written in two formats.

[package com.javaprogramto.kotlin.main

fun main() {

print("Hello world")

}]

As you have seen the above code that is the main() method in the kotlin and does not take any arguments and no return type to it.


You have to save this as file extension as file-name.kt. So, kt is the extension of the source file in kotlin.

Create Kotiln's first program and run from Intelleji IDE.

Once you write the code in Intelleji IDE, it detects the main() method automatically and it will show the arrow or play symbol at the main() method line and it will be on the left sidebar.

Once you click on that it will show the options to run and debug the program as well as it shows another option that generates the output with the coverage.

Here, you can see all the options available in the IntelliJ IDE.

Once you click on the "Run" or "control + shift+ F10", it will show the output on the console.

It has a printed "Hello World" program.

3. fun main(args: Array<String>) Example - - Main Function

Another way to create the main function in kotlin. In this way, you can pass the string array as in the main() method in java.

[fun main(args: Array<String>) {

println("Hello world with string[] array as argument")

}]

Output:

[Hello world with string[] array as argument]

If you want to pass any values to the main method, you can pass it.

Provide the values as shown in the above picture and print the arguments from the main method.

[fun main(args: Array<String>) {

println("Hello world with string[] array as argument")
println("argumens : "+Arrays.toString(args))

}]

Output:

[Hello world with string[] array as argument
argumens: [one, two]]

4. Conclusion

In conclusion, You've learned how to create the main function or main method in two ways. The first way is without passing any argument and second is passing String[] array arguments.

Both will work in all scenarios.

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Kotlin Main Function