Kotlin-first?
Java Kotlin
Platform SDK support Yes Yes
Android Studio support Yes Yes
Lint Yes Yes
Guided docs support Yes Yes
API docs support Yes Yes
AndroidX support Yes Yes
AndroidX Kotlin-specific APIs (e.g. KTX, coroutines) N/A Yes
Online training Best effort Yes
Samples Best effort Yes
Multi-platform Projects No Yes
Jetpack Compose No Yes
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60% のアプリで利用（TOP 1000）
Kotlin-first?
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Kotlin vs Java?
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public final class Dog {
private String name;
private Color color;
private LocalDate birthday;
private float height;
private float weight;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Color getColor() {
return color;
}
Kotlin
data class Dog(
var name: String,
var color: Color,
var birthday: LocalDate,
var height: Float,
var weight: Float
)
Java