EARTH WEEK
Now through April 22, save up to 70% on digital learning resources. Learn more.
Register your product to gain access to bonus material or receive a coupon.
Accessible from your Account page after purchase. Requires the free QuickTime Player software.
Videos can be viewed on: Windows 8, Windows XP, Vista, 7, and all versions of Macintosh OS X including the iPad, and other platforms that support the industry standard h.264 video codec.
This lesson shows you how to use polymorphism to “program in the general,” making systems more extensible and maintainable. You’ll learn how to override methods, distinguish between abstract and concrete classes, declare abstract methods, determine object type at execution, and finally use interfaces.