This video explores a problem associated with using the interface to get the right type on the duck simulator.
- [Instructor] Now if you're a well-schooled … Java developer, you might be saying, … hey, let's use interfaces instead. … You might remember that an interface … defines the methods an object must implement … in order to be a particular type. … For instance, if a duck implements a flyable interface … with one method fly, then duck must implement … the method fly to be considered the flyable type. … So interfaces allow different classes … to share similarities like ducks sharing a fly behavior. … Interfaces also allow for having two classes that are alike, … but don't have the same behavior, … for some ducks being able to fly and some not. … So interfaces actually sound perfect for our design. … Let's rework our duck interfaces … and see how well this works out. … We'll begin by creating two interfaces, … flyable and quackable, if I'm a duck and I fly, … I implement the flyable interface, … and if I'm a duck and I quack, … I implement the quackable interface. … And our duck superclass now just needs a swim method …
- What are design patterns?
- Encapsulating code that varies with the Strategy pattern
- The limitations of inheritance
- Using the Adapter pattern
- Implementing the Observer pattern
- Extending behavior with composition and the Decorator pattern
- Encapsulating iteration with the Iterator pattern
- Object creation with the Factory Method pattern
- Using design principles to guide your object-oriented design
Skill Level Intermediate
1. Design Patterns
2. The Strategy Pattern
3. The Adapter Pattern
4. The Observer Pattern
Using the Observer pattern2m 23s
5. The Decorator Pattern
6. The Iterator Pattern
7. The Factory Patterns
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.Cancel
Take notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.