ДЗ 2

.gitignore

@@ -1,2 +1,3 @@
 # Project exclude paths
-/.gradle/
+/.gradle/
+/build/

build.gradle

@@ -2,6 +2,10 @@ plugins {
     id 'org.jetbrains.kotlin.jvm' version '1.7.21'
 }
 
+test {
+    useJUnitPlatform()
+}
+
 group 'ru.otus'
 version '1.0-SNAPSHOT'
 
@@ -11,4 +15,5 @@ repositories {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib"
+    implementation 'org.junit.jupiter:junit-jupiter:5.9.2'
 }

src/main/kotlin/ru/otus/homework2/Builder.kt

@@ -0,0 +1,36 @@
+package ru.otus.homework2
+
+
+class Account(private val config: Builder) {
+
+    fun info(): String {
+        return "Имя: ${config.name}. Никнейм: ${config.nickname}"
+    }
+
+    fun mail(): String {
+            return "Email: ${config.email}"
+    }
+
+    companion object Builder {
+        private var name: String? = null
+        private var nickname: String? = null
+        private var email: String? = null
+
+        fun name(value: String) = apply { name = value }
+        fun nickname(value: String) = apply { nickname = value }
+        fun email() = apply { email = "$nickname@mail.ru" }
+
+        fun build(): Account {
+            return Account(this)
+        }
+    }
+}
+fun main() {
+    val account = Account
+        .name("Evgeniy")
+        .nickname("zackzevs")
+        .email()
+        .build()
+    println(account.info())
+    println(account.mail())
+}

src/main/kotlin/ru/otus/homework2/Command.kt

@@ -0,0 +1,37 @@
+package ru.otus.homework2
+
+interface Command {
+    fun execute()
+}
+class Text {
+    fun print() {
+        println("Привет")
+    }
+    fun print2() {
+        println("Пока")
+    }
+}
+class ObjText(private val string: Text) : Command {
+    override fun execute() {
+        string.print()
+    }
+}
+class ObjText2(private val string: Text) : Command {
+    override fun execute() {
+        string.print2()
+    }
+}
+class Invoker (var command: Command) {
+    fun doExecute() {
+        command.execute()
+    }
+}
+fun main() {
+    val text = Text()
+    val objText = ObjText(text)
+    val objText2 = ObjText2(text)
+    val invoker = Invoker(objText)
+    invoker.doExecute()
+    invoker.command = objText2
+    invoker.doExecute()
+}

src/main/kotlin/ru/otus/homework2/Decorator.kt

@@ -0,0 +1,41 @@
+package ru.otus.homework2
+
+interface Coffee {
+    fun decorate(): String
+}
+
+class BlackCoffee : Coffee {
+    override fun decorate() = "Кофе"
+}
+
+abstract class CoffeeDecorator(private val coffee: Coffee) : Coffee {
+    override fun decorate(): String {
+        return coffee.decorate()
+    }
+}
+class WithMilk(coffee: Coffee) : CoffeeDecorator(coffee) {
+    override fun decorate(): String {
+        return super.decorate() + decorateWithMilk()
+    }
+    private fun decorateWithMilk(): String {
+        return ", молоко"
+    }
+}
+class WithSugar(coffee: Coffee) : CoffeeDecorator(coffee) {
+    override fun decorate(): String {
+        return super.decorate() + decorateWithSugar()
+    }
+    private fun decorateWithSugar(): String {
+        return ", сахар"
+    }
+}
+fun main() {
+    val blackCoffee = BlackCoffee()
+    val withMilkCoffee = WithMilk(blackCoffee)
+    val withSugarCoffee = WithSugar(blackCoffee)
+    val withSugarAndWithMilkCoffee = WithMilk(withSugarCoffee)
+    println(blackCoffee.decorate())
+    println(withMilkCoffee.decorate())
+    println(withSugarCoffee.decorate())
+    println(withSugarAndWithMilkCoffee.decorate())
+}

src/main/kotlin/ru/otus/homework2/Singlton.kt

@@ -0,0 +1,27 @@
+package ru.otus.homework2
+
+class Singleton private constructor(){
+
+    init {
+        println("Singleton class вызван.")
+    }
+    fun start(){
+        println("Начали")
+    }
+    fun end(){
+        println("Закончили")
+    }
+    companion object {
+        val instance: Singleton by lazy { Singleton() }
+    }
+}
+
+fun main() {
+    val one = Singleton.instance
+    one.start()
+    one.end()
+    val two = Singleton.instance
+    two.start()
+    two.end()
+    println(one === two)
+}