interface IXxxable
interface IYyyable
interface IZzzable
interface IDevicePc extends IXxxable, IYyyable, IZzzable
interface IDevicePos extends IYyyable, IZzzable
interface IDeviceMobile extends IXxxable, IYyyable
class Item
class ItemPc extends Item implements IDevicePc
class ItemPos extends Item implements IDevicePos
class ItemMobile extends Item implements IDeviceMobile
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…