LinkedIn principal author Doug Winnie explains how you can extend classes in object-oriented programming. Using a class, you can extend it to add unique members to the class while still preserve the existing members of the base class. Using classes and extending them creates a class hierarchy that you can use to build and plan out the code in your project.
- When you create a class,…you aren't limited to just that class.…Using that basic blueprint,…you can improve that blueprint…and add more capabilities to it.…Take, for example, a class that defines an animal.…An animal has weight, color, or hair color,…a gender and an age.…An animal needs to do some basic things.…It needs to eat, sleep and move.…But different animals can extend that definition.…A cat can run, a fish can swim and a bird can fly.…
By using a class for an animal, we can extend it…and add new capabilities to a class, while at the same time,…bring along everything that is part of another class.…So if we have the animal class,…I can create a cat class that extends the animal class.…In the cat class, I can create a run method.…And everything else that is…part of an animal is part of the cat.…The same thing works for a fish or a bird.…In each one I add what is unique to that class.…
And I extend the animal class.…As a result, you end up with a hierarchy.…You have a class that starts everything.…Often in programming languages,…
Author
Doug Winnie
Released
11/28/2016Join Doug Winnie as he explains the principles of programming and helps you connect to core concepts by exploring three ways that programmers perform their jobs. Doug starts by sharing the history of coding and then dives into functions, values, variables, and parameters used to define actions. He covers capturing input from users, creating conditional tests, using loops with arrays, and object-oriented programming basics. He also takes you beyond programming, into processes like debugging, refactoring, and building iteratively.
- Working with values and variables
- Breaking down tasks
- Customizing functions and parameters
- Building conditional tests
- Creating and changing arrays
- Working with objects and classes
- Debugging and refactoring code
- Going beyond the code as a programmer
Skill Level Beginner
Duration
Views
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Introduction
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Welcome1m 40s
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What you should know1m 3s
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1. Control Computers with Code
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History of programming2m 9s
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Forms of programming5m 12s
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2. Define Actions Using Code
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Break down tasks2m 29s
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Variables and scope2m 9s
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Return values from functions2m 15s
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Work with an API1m 27s
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3. Repeat Actions and Test for Conditions
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Capture input from the user3m 31s
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Create conditional tests4m 39s
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Use while loops2m 11s
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Use for loops3m 11s
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Use loops with arrays2m 5s
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4. Objects and OOP
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Everything is an object2m 21s
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Everything is a class4m 3s
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Extend classes2m 7s
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5. Beyond Programming
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Debug problems2m 50s
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Conclusion
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Next steps1m 19s
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Video: Extend classes