1. App class 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Study_008 { class App { public App() { Factory factory = new Factory(); SiegeTank tank = factory.CreateTank(); tank.Move(); tank.ChangeMode(); tank.Move(); } } } 2. Factory class 1 2 3 4 5 6 7 ..