Back
Close

Kotlin Tour

joow
10.3K views
01 Hello, Kotlin
02 Variables
03 Functions
04 Control structures
05 Interoperability
06 Classes
07 Nullability
08 Lambdas
Previous: Control structures Next: Classes

Interoperability

Kotlin -> Java

https://kotlinlang.org/docs/reference/java-interop.html

Kotlin can almost use any Java code without issue.

Instanciate a new user and display its email
val user: UserJava = TODO()
fun displayEmail(): Unit = TODO()
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Java -> Kotlin

https://kotlinlang.org/docs/reference/java-to-kotlin-interop.html

Using Kotlin in Java is almost quite easy.

Check if the password of the user is valid (at least 8 characters)
class User(val email: String, val password: String) {
fun isPasswordValid(): Boolean = TODO()
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Create your playground on Tech.io
This playground was created on Tech.io, our hands-on, knowledge-sharing platform for developers.
Go to tech.io
Suggested playgrounds

Why Kotlin

By
kow
3,364
5

Formation Kotlin

By
Takoyaki
7,483
11

Ktor as a backend Application

By
romainbsl
3,058
3

Kotlin Starter Pack

By
romainbsl
21K
40
codingame x discord
Join the CodinGame community on Discord to chat about puzzle contributions, challenges, streams, blog articles - all that good stuff!
JOIN US ON DISCORD
Online Participants