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Kotlin
Create a new console project to explore Kotlin | IntelliJ IDEA
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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
← Previous topic
Download and install IntelliJ IDEA to explore Kotlin
Next topic →
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 ?
Function
•
fun() { ... } is a function in Kotlin. The function is needed to perform an action.
Lambda function
•
Lambda function in Kotlin. Example 1: var myFunc1 : (a:Int, b:Int) -> Int = { p1, p2 -> p1 + p2 };
Collections and Arrays
•
Create collections list, set, map and an array array in Kotlin
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> { ... }
Writing a program
•
The Kotlin console app works like Android Jetpack Compose
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