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Kotlin
 Create a new console project to explore Kotlin | IntelliJ IDEA 
посмотрели 3006 раз
обновлено: 12 July 2026
Note! You must have Java JDK installed. If you don't have it, then need to download and install Java JDK ...

Note! You must have IntelliJ IDEA installed. If you don't have it, then can be downloaded and installed for free IntelliJ IDEA Community ...
Step 1. Open IntelliJ IDEA
Step 2. Let's create a new project in IntelliJ IDEA
 
Let's choose the programming language: Kotlin.
Select JDK: if you want Kotlin to be compatible with Android, then choose Oracle OpenJDK.
 
A new application has been created:
Step 3. Launching the project
 
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Download and install IntelliJ IDEA to explore Kotlin
 
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Declare the variable and set the value in Kotlin | val, var, lateinit, constant: const val, global variable: companion object
 
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  Объявления  
  Объявления  
 
• What is Kotlin?
• Why is IntelliJ IDEA the most popular development environment for Kotlin?
• Download and install IntelliJ IDEA to explore Kotlin
• Create a new console project to explore Kotlin | IntelliJ IDEA
Setting the value
• Declare the variable and set the value in Kotlin | val, var, lateinit, constant: const val, global variable: companion object
null
• null value, use the symbol ? and ?. and !! and ?: and !!. and ?. in Kotlin
Int, Float, Boolean, Char ...
• Integer numbers in Kotlin are: Byte, UByte, Short, UShort, Int, UInt, Long, ULong
• Decimal numbers in Kotlin are: Float, Double
• A flag with values of true or false in Kotlin is: Boolean
• The symbol in Kotlin is: Char
• Convert number to text in Kotlin | Int → String
String
• The string, the text in Kotlin is: String
• Interpolate strings in Kotlin. Example: val address:String = "${street}, ${country}"
• What is the difference between String and StringBuilder ?
Enum
• What is an enumeration (enum) in Kotlin ?
• How do I find enum by value in Kotlin ?
Collections and Arrays
• What are collections in Kotlin?
• Create collections list, set, map and an array array in Kotlin
Function
• fun() { ... } is a function in Kotlin. The function is needed to perform an action.
Extension function
• Extension function in Kotlin. Allows you to add a new function to the system (List, ..) or my (Book, ...) class
Lambda function
• Lambda function in Kotlin. Example 1: var myFunc1 : (a:Int, b:Int) -> Int = { p1, p2 -> p1 + p2 };
Class
• What is class in Kotlin? Example: class MyBook { ... } | Primary and secondary constructor | block init
• lateinit is a late initialization for the class field | Kotlin
• class that inherits from interface in Kotlin | Example: class MyBook : IBook { ...}
• Unnamed class that inherits from interface in Kotlin | Example: val book1 = object : IBook { ...}
• Generic, template class in Kotlin | Example: class MyBook<T> { ... }
Flow
• flow is the data flow in Kotlin. These are the substitution of LiveData in Android Kotlin and the substitution of Observable in RxJava
Writing a program
• The Kotlin console app works like Android Jetpack Compose
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