How to do it...

In the following steps, we will be creating a Kotlin project with the Gradle build system. First, we will select the Create New Project option from the menu. Then, follow these steps:

1. Create the project with the Gradle build system:

1. After you have created the project, you will have the build.gradle file, which will look something like the following:

version '1.0-SNAPSHOT'

buildscript {
  ext.kotlin_version = '1.1.4-3'

  repositories {
      mavenCentral()
  }
  dependencies {
      classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  }
}

apply plugin: 'java'
apply plugin: 'kotlin'

sourceCompatibility = 1.8

repositories {
  mavenCentral()
}

dependencies {
  compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
  testCompile group: 'junit', name: 'junit', version: '4.12'
}

compileKotlin {
  kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
  kotlinOptions.jvmTarget = "1.8"
}

1. Now we will create a HelloWorld class, which will have a simple main function:

1. Now, it would be really cool to run this code directly. To do so, we will use the gradle run command. However, before that, we need to enable the application plugin, which will allow us to directly run this code. We need to add two lines in the build.gradle file to set it up:

apply plugin: 'application'
mainClassName = "HelloWorldKt"

1. After this, you can type gradle run in the terminal to execute this file, and you will see the output of the method, as shown: