kyawhtut-cu

fun TrafficLight.isDrive(): Boolean = when (color) {
    "green", "yellow" -> true
    else -> false
}

kyawhtut-cu

public class TrafficLightJavaTest {

    public static void main(String[] args) {
        TrafficLight trafficLight = new TrafficLight("red");
        boolean isDrive = TrafficLightExtensionKt.isDrive(trafficLight);
    }
}

kyawhtut-cu

@file:JvmName("TrafficLightUtils")

package ...

fun TrafficLight.isDrive(): Boolean = when (color) {
    "green", "yellow" -> true
    else -> false
}

kyawhtut-cu

package com.kyawhtut.ankotest;

public class TrafficLightJavaTest {

    public static void main(String[] args) {
        TrafficLight trafficLight = new TrafficLight("red");
        boolean isDrive = TrafficLightExtensionKt.isDrive(trafficLight); // this is compile time error
        boolean isDrive = TrafficLightUtils.isDrive(trafficLight); // this will work
    }
}

kyawhtut-cu

public class Ticket {
    public final String ticketName;

    Ticket(String ticketName) {
        this.ticketName = ticketName;
    }
}

kyawhtut-cu

data class Ticket(
  val ticketName: String
)

kyawhtut-cu

data class User(
    var name: String,
    var age: Int,
    var address: String = "",
    var gender: String
)

kyawhtut-cu

public class UserTestJava {

    public static void main(String[] args) {
        User user = new User("Mg Mg",23, "Yangon", "male"); // that is work
        User user = new User("Mg Mg",23, "male"); // that is compile time error
    }
}

kyawhtut-cu

class UserTestKt {
    val user = User(
        "Mg Mg",
        23,
        gender = "male"
    ) // that is work

    val user = User(
        "Mg Mg",
        23,

kyawhtut-cu

data class User @JvmOverloads constructor(
    var name: String,
    var age: Int,
    var address: String = "",
    var gender: String
)