Data commit

Task/Deepcopy/Kotlin/deepcopy.kotlin

@@ -0,0 +1,71 @@
+// Version 1.2.31
+
+import java.io.Serializable
+import java.io.ByteArrayOutputStream
+import java.io.ByteArrayInputStream
+import java.io.ObjectOutputStream
+import java.io.ObjectInputStream
+
+fun <T : Serializable> deepCopy(obj: T?): T? {
+    if (obj == null) return null
+    val baos = ByteArrayOutputStream()
+    val oos  = ObjectOutputStream(baos)
+    oos.writeObject(obj)
+    oos.close()
+    val bais = ByteArrayInputStream(baos.toByteArray())
+    val ois  = ObjectInputStream(bais)
+    @Suppress("unchecked_cast")
+    return ois.readObject() as T
+}
+
+class Person(
+    val name: String,
+    var age: Int,
+    val sex: Char,
+    var income: Double,
+    var partner: Person?
+) : Serializable
+
+fun printDetails(p1: Person, p2: Person?, p3: Person, p4: Person?) {
+    with (p3) {
+        println("Name    : $name")
+        println("Age     : $age")
+        println("Sex     : $sex")
+        println("Income  : $income")
+        if (p4 == null) {
+            println("Partner : None")
+        }
+        else {
+            println("Partner :-")
+            with (p4) {
+                println("  Name   : $name")
+                println("  Age    : $age")
+                println("  Sex    : $sex")
+                println("  Income : $income")
+            }
+        }
+        println("\nSame person as original '$name' == ${p1 === p3}")
+        if (p4 != null) {
+            println("Same person as original '${p2!!.name}' == ${p2 === p4}")
+        }
+    }
+    println()
+}
+
+fun main(args: Array<String>) {
+    var p1 = Person("John", 35, 'M', 50000.0, null)
+    val p2 = Person("Jane", 32, 'F', 25000.0, p1)
+    p1.partner = p2
+    var p3 = deepCopy(p1)
+    val p4 = p3!!.partner
+    printDetails(p1, p2, p3, p4)
+
+    println("..or, say, after 2 years have elapsed:-\n")
+    with (p1) {
+        age = 37
+        income = 55000.0
+        partner = null
+    }
+    p3 = deepCopy(p1)
+    printDetails(p1, null, p3!!, null)
+}