kalaiselvan369

package data_classes

data class Machine(val name: String)

enum class ShipType {
    CRUISE,
    WAR,
    GOODS
}

kalaiselvan369

fun main() {

    val a: Int? = null

    println(a)

    var b: String? = "Hi"

    // !! means non null assertion
    for (char in b!!) {

kalaiselvan369

package enumerations


fun main() {
    val east = Direction.EAST
    println(east.notation)
    println(east.oppositeDirection())

    //println(east.opposite()) // not possible, you cannot invoke extension function declared inside class
    east.westOpposite()

kalaiselvan369

package using_when

import kotlin.random.Random

fun main() {

    val a = Random.nextInt(2)

    when (a) {
        2 -> println("even")

kalaiselvan369

fun main() {
    "Hi".singleQuote()
    "Hello".strangeQuote()

    val player = Player(name = "Sachin", team = "India")
    player.hobbies(player.name)
}

fun String.singleQuote() = "'${this}'"
fun String.doubleQuote() = "\"${this}\""

kalaiselvan369

import java.sql.Date


fun main() {
    exploreRangeTo()

    val scoreBoard = ScoreBoard()
    scoreBoard + 6
    println(scoreBoard.displayScore())
}

kalaiselvan369

fun main() {

    // various string template options
    val n = 10
    println("value is $n")

    val message = "The value is $n"
    println(message)

    val result = "The multiple is ${n * 8}"

kalaiselvan369

fun main() {
  
  // we use parameter name while passing arguments to a function. 
  loadNextPage(page = 1, itemsPerPage = 10)
}


// itemsPerPage parameter by default has its value as 20
fun loadNextPage(page: Int, itemsPerPage: Int = 20) {

kalaiselvan369

fun main() {

    val car = Car()
    // although it is protected inside vehicle class while overriding it 
    // in the subclass we marked as public hence it is accessbile
    car.start()

    //car.engineStart() // not accessible since it is protected inside the car class
}

kalaiselvan369

class User {

    private var userName: String? = null // not accessible outside the class
    private var password: String? = null // not accessible outside the class

    val displayName: String = "Joey" // accessible outside the class

    private val messages = mutableListOf<String>()

    private fun resetPassword() {