Merge pull request #9603 from eugenp/KTLN-137

KTLN-137 move kotlin article

patterns/design-patterns-behavioral-2/src/main/java/com/baeldung/observer/IObservable.kt

@@ -1,18 +0,0 @@
-package com.baeldung.observer
-
-import java.util.ArrayList
-
-interface IObservable {
-    val observers: ArrayList<IObserver>
-    fun add(observer: IObserver) {
-        observers.add(observer)
-    }
-
-    fun remove(observer: IObserver) {
-        observers.remove(observer)
-    }
-
-    fun sendUpdateEvent() {
-        observers.forEach { it.update() }
-    }
-}

patterns/design-patterns-behavioral-2/src/main/java/com/baeldung/observer/IObserver.kt

@@ -1,5 +0,0 @@
-package com.baeldung.observer
-
-interface IObserver {
-    fun update()
-}

patterns/design-patterns-behavioral-2/src/main/java/com/baeldung/observer/delegates/BaeldungNewsletter.kt

@@ -1,10 +0,0 @@
-package com.baeldung.observer.delegates
-
-import kotlin.properties.Delegates
-
-class BaeldungNewsletter {
-    val newestArticleObservers = mutableListOf<(String) -> Unit>()
-    var newestArticleUrl: String by Delegates.observable("") { _, _, newValue ->
-        newestArticleObservers.forEach { it(newValue) }
-    }
-}

patterns/design-patterns-behavioral-2/src/main/java/com/baeldung/observer/delegates/BaeldungReader.kt

@@ -1,8 +0,0 @@
-package com.baeldung.observer.delegates
-
-fun main() {
-    val newsletter = BaeldungNewsletter()
-    newsletter.newestArticleObservers.add { newestArticleUrl ->
-        println("New Baeldung article: ${newestArticleUrl}")
-    }
-}

patterns/design-patterns-behavioral-2/src/main/java/com/baeldung/observer/standard/BaeldungNewsletter.kt

@@ -1,14 +0,0 @@
-package com.baeldung.observer.standard
-
-import com.baeldung.observer.IObservable
-import com.baeldung.observer.IObserver
-import java.util.ArrayList
-
-class BaeldungNewsletter : IObservable {
-    override val observers: ArrayList<IObserver> = ArrayList()
-    var newestArticleUrl = ""
-        set(value) {
-            field = value
-            sendUpdateEvent()
-        }
-}

patterns/design-patterns-behavioral-2/src/main/java/com/baeldung/observer/standard/BaeldungReader.kt

@@ -1,9 +0,0 @@
-package com.baeldung.observer.standard
-
-import com.baeldung.observer.IObserver
-
-class BaeldungReader(private var newsletter: BaeldungNewsletter) : IObserver {
-    override fun update() {
-        println("New Baeldung article: ${newsletter.newestArticleUrl}")
-    }
-}