Домашнее задание на паттерны

Builder.kt

@@ -0,0 +1,39 @@
+class Person {
+    private var name: String? = null
+    private var surname: String? = null
+    private var age = 0
+
+    class Builder {
+        private val newPerson: Person
+        fun withName(name: String?): Builder {
+            newPerson.name = name
+            return this
+        }
+
+        fun withSurname(surname: String?): Builder {
+            newPerson.surname = surname
+            return this
+        }
+
+        fun withAge(age: Int): Builder {
+            newPerson.age = age
+            return this
+        }
+
+        fun build(): Person {
+            return newPerson
+        }
+
+        init {
+            newPerson = Person()
+        }
+    }
+}
+
+fun main(){
+    val myPerson = Person.Builder()
+        .withName("John")
+        .withSurname("Connor")
+        .withAge(39)
+        .build()
+}

Command.kt

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+interface Command{
+    fun execute()
+}
+class Lamp{
+    fun on(){
+        println("Lamp is on")
+    }
+    fun off(){
+        println("Lamp is off")
+    }
+}
+class OnLamp(val lamp: Lamp): Command {
+    override fun execute() {
+        lamp.on()
+    }
+}
+class OffLamp(val lamp: Lamp): Command {
+    override fun execute() {
+        lamp.off()
+    }
+}
+class LampInvoker(var command: Command) {
+    fun execute() {
+        command.execute()
+    }
+}
+fun main(){
+    val lamp = Lamp()
+    val onLamp = OnLamp(lamp)
+    val offLamp = OffLamp(lamp)
+    val lampInvoker = LampInvoker(onLamp)
+    lampInvoker.execute()
+}

Decorator.kt

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+interface Machine{
+    fun drive(){
+    }
+}
+
+open class Car: Machine{
+    override fun drive() {
+        println("This is car")
+    }
+}
+
+class ColoredCar(val sample:Car, val color: String): Car(){
+    override fun drive() {
+        sample.drive()
+        println("Color of car is $color")
+    }
+}
+
+fun main() {
+    val car = Car()
+    car.drive()
+    val color = readLine()!!.toString()
+    val coloredCar = ColoredCar(car,color)
+    coloredCar.drive()
+}

SingleLazy.kt

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+object Singleton{
+
+    init {
+        println("1")
+    }
+
+    object Holder {
+        val INSTANCE = Singleton
+    }
+
+    object Lazy {
+        val instance: Singleton by lazy {
+            Holder.INSTANCE
+        }
+    }
+
+    var b: String = "2"
+}
+fun main() {
+    println(Singleton.Lazy.instance.b)
+    Singleton.Lazy.instance.b = "3"
+    println(Singleton.Lazy.instance.b)
+    println(Singleton.Lazy.instance.b)
+}