Updates on files

Author: Alexander Rogalskiy

patterns/src/main/kotlin/io/nullables/api/playground/patterns/parent_call/Greeting.kt

@@ -0,0 +1,23 @@
+package io.nullables.api.playground.patterns.parent_call
+
+class Greeting(val word: String)
+
+open class Father {
+    init {
+        sayGreeting()
+    }
+
+    open fun sayGreeting() = println("Luke! I'm your Father!!!")
+}
+
+class Leia : Father() {
+    private var greeting: Greeting? = null
+        get() {
+            if (field == null) {
+                field = Greeting("I love you!")
+            }
+            return field
+        }
+
+    override fun sayGreeting() = println(greeting!!.word)
+}