ITelephone timsPhone
Classeg.DeskPhone
Interfaceeg.ITelephone
Classeg.MobilePhone
initiationeg.timsPhone
……
Code example:ITelephone timsPhone;timsPhone = new DeskPhone(123456);timsPhone.powerOn();timsPhone = new MobilePhone(24565);timsPhone.powerOn();
What is Interface?-Interface就像一个contract，指定了所有behavior that classes must have
