class Item{ String name=''; int damage=0; int price=0; Item(); Item.setData(String name, int price, {int damage=0}){ this.name = name; this.damage = damage; this.price = price; } void showInfo(){ print("name: $name, damage: $damage, price: $price"); } } class Sword extends Item{ @override int damage=10; Sword(); Sword.setData(String name, int price, int damage) : super.setData(name, price, damag..