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86 lines
1.9 KiB
Kotlin
86 lines
1.9 KiB
Kotlin
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import kotlin.math.*
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data class Example(
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val name: String,
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val numbers: List<Int?>
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)
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fun interface JokeInterface {
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fun isFunny(): Boolean
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}
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abstract class AbstractJoke : JokeInterface {
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override fun isFunny() = false
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abstract fun content(): String
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}
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class Joke : AbstractJoke() {
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override fun isFunny(): Boolean {
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return true
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}
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override fun content(): String = "content of joke here, haha"
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}
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class DelegatedJoke(val joke: Joke) : JokeInterface by joke {
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val number: Long = 123L
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companion object {
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const val someConstant = "some constant text"
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}
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}
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object SomeSingleton
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sealed class Shape {
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abstract fun area(): Double
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}
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data class Square(val sideLength: Double) : Shape() {
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override fun area(): Double = sideLength.pow(2)
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}
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object Point : Shape() {
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override fun area() = .0
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}
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class Circle(val radius: Double) : Shape() {
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override fun area(): Double {
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return PI * radius * radius
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}
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}
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fun String.extensionMethod() = "test"
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fun main() {
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val name = """
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multiline
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string
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some numbers: 123123 42
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""".trimIndent()
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val example = Example(name = name, numbers = listOf(512, 42, null, -1))
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example.numbers
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.filterNotNull()
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.forEach { println(it) }
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setOf(Joke(), DelegatedJoke(Joke()).joke)
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.filter(JokeInterface::isFunny)
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.map(AbstractJoke::content)
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.forEachIndexed { index: Int, joke ->
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println("I heard a funny joke(#${index + 1}): $joke")
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}
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listOf(Square(12.3), Point, Circle(5.2))
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.associateWith(Shape::area)
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.toList()
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.sortedBy { it.second }
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.forEach {
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println("${it.first}: ${it.second}")
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}
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println("some string".extensionMethod())
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require(SomeSingleton::class.simpleName == "SomeSingletonName") { "something does not seem right..." }
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}
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