Kotlin class deep copy.

KotlinClassDeepCopy.kt

data class User(var name:String,var list:List<User>) : Serializable


fun <T:Serializable?>T.deepCopy(): T? {
    if (this == null) return null
    val baos = ByteArrayOutputStream()
    val oos  = ObjectOutputStream(baos)
    oos.writeObject(this)
    oos.close()
    val bais = ByteArrayInputStream(baos.toByteArray())
    val ois  = ObjectInputStream(bais)
    @Suppress("unchecked_cast")
    return ois.readObject() as T
}