.. This file is part of the OpenDSA eTextbook project. See
.. http://opendsa.org for more details.
.. Copyright (c) 2012-2020 by the OpenDSA Project Contributors, and
.. distributed under an MIT open source license.

.. avmetadata::
   :author: Molly Domino


More on Polymorphism
====================

Objectives
----------

* Review Java Interfaces and Abstract Classes
* Review Inheritance and Composition
* Review Overloading and Overriding
* Review Reference Variables
* Apply Typecasting

Polymorphism Measurable Interface
---------------------------------

Polymorphism Example Code
~~~~~~~~~~~~~~~~~~~~~~~~~
.. admonition:: Try It Yourself

   In Eclipse, use the *Project > Download Assignment...* menu command to download the exercise project named "ex07.04-MeasurableInterface". Use this example to follow along with the following video. Feel free to experiment. 
   
   Refer to `01.02: Lab: LightBot for Beginners <https://profdev-lms.tlos.vt.edu/courses/2832/assignments/10634>`_ if you need to review the instructions for downloading Eclipse projects.

[7:23] The Measurable Interface
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. raw:: html

     <center>
     <iframe id="kaltura_player" src="https://cdnapisec.kaltura.com/p/2375811/sp/237581100/embedIframeJs/uiconf_id/41950791/partner_id/2375811?iframeembed=true&playerId=kaltura_player&entry_id=1_ywzatt7g&flashvars[streamerType]=auto&amp;flashvars[localizationCode]=en&amp;flashvars[leadWithHTML5]=true&amp;flashvars[sideBarContainer.plugin]=true&amp;flashvars[sideBarContainer.position]=left&amp;flashvars[sideBarContainer.clickToClose]=true&amp;flashvars[chapters.plugin]=true&amp;flashvars[chapters.layout]=vertical&amp;flashvars[chapters.thumbnailRotator]=false&amp;flashvars[streamSelector.plugin]=true&amp;flashvars[EmbedPlayer.SpinnerTarget]=videoHolder&amp;flashvars[dualScreen.plugin]=true&amp;flashvars[Kaltura.addCrossoriginToIframe]=true&amp;&wid=1_ootb9ij8" width="560" height="630" allowfullscreen webkitallowfullscreen mozAllowFullScreen allow="autoplay *; fullscreen *; encrypted-media *" sandbox="allow-forms allow-same-origin allow-scripts allow-top-navigation allow-pointer-lock allow-popups allow-modals allow-orientation-lock allow-popups-to-escape-sandbox allow-presentation allow-top-navigation-by-user-activation" frameborder="0" title="Kaltura Player"></iframe>
     </center>


.. raw:: html

   <a href="https://courses.cs.vt.edu/~cs2114/meng-bridge/course-notes/7.4.1.1-JavaOOPPolyMeasurable.pdf" target="_blank">
   <img src="https://courses.cs.vt.edu/~cs2114/meng-bridge/images/projector-screen.png" width="32" height="32">
   Video Slides 7.4.1.1-JavaOOPPolyMeasurable.pdf</img>
   </a>



Checkpoint 1
------------

.. avembed:: Exercises/SWDesignAndDataStructs/OOP2Checkpoint1Summ.html ka
   :long_name: Checkpoint 1


Programming Practice: Polymorphism 1
------------------------------------

.. extrtoolembed:: 'Programming Practice: Polymorphism 1'
   :workout_id: 1907

Polymorphism Computer Superclass
--------------------------------

[12:09] The Computer Superclass
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


.. raw:: html

     <center>
     <iframe id="kaltura_player" src="https://cdnapisec.kaltura.com/p/2375811/sp/237581100/embedIframeJs/uiconf_id/41950791/partner_id/2375811?iframeembed=true&playerId=kaltura_player&entry_id=1_pkxo2beb&flashvars[streamerType]=auto&amp;flashvars[localizationCode]=en&amp;flashvars[leadWithHTML5]=true&amp;flashvars[sideBarContainer.plugin]=true&amp;flashvars[sideBarContainer.position]=left&amp;flashvars[sideBarContainer.clickToClose]=true&amp;flashvars[chapters.plugin]=true&amp;flashvars[chapters.layout]=vertical&amp;flashvars[chapters.thumbnailRotator]=false&amp;flashvars[streamSelector.plugin]=true&amp;flashvars[EmbedPlayer.SpinnerTarget]=videoHolder&amp;flashvars[dualScreen.plugin]=true&amp;flashvars[Kaltura.addCrossoriginToIframe]=true&amp;&wid=1_ajw1uwvr" width="560" height="630" allowfullscreen webkitallowfullscreen mozAllowFullScreen allow="autoplay *; fullscreen *; encrypted-media *" sandbox="allow-forms allow-same-origin allow-scripts allow-top-navigation allow-pointer-lock allow-popups allow-modals allow-orientation-lock allow-popups-to-escape-sandbox allow-presentation allow-top-navigation-by-user-activation" frameborder="0" title="Kaltura Player"></iframe>
     </center>

.. raw:: html

   <a href="https://courses.cs.vt.edu/~cs2114/meng-bridge/course-notes/7.4.4.1-JavaOOPPolyComputer.pdf" target="_blank">
   <img src="https://courses.cs.vt.edu/~cs2114/meng-bridge/images/projector-screen.png" width="32" height="32">
   Video Slides 7.4.4.1-JavaOOPPolyComputer.pdf</img>
   </a>

Checkpoint 2
------------

.. avembed:: Exercises/SWDesignAndDataStructs/OOP2Checkpoint2Summ.html ka
   :long_name: Checkpoint 2





Polymorphism Integer Example
----------------------------

[7:40] Java Polymorphism Integer Example
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. raw:: html

     <center>
     <iframe id="kaltura_player" src="https://cdnapisec.kaltura.com/p/2375811/sp/237581100/embedIframeJs/uiconf_id/41950791/partner_id/2375811?iframeembed=true&playerId=kaltura_player&entry_id=0_33oovpxg&flashvars[streamerType]=auto&amp;flashvars[localizationCode]=en&amp;flashvars[leadWithHTML5]=true&amp;flashvars[sideBarContainer.plugin]=true&amp;flashvars[sideBarContainer.position]=left&amp;flashvars[sideBarContainer.clickToClose]=true&amp;flashvars[chapters.plugin]=true&amp;flashvars[chapters.layout]=vertical&amp;flashvars[chapters.thumbnailRotator]=false&amp;flashvars[streamSelector.plugin]=true&amp;flashvars[EmbedPlayer.SpinnerTarget]=videoHolder&amp;flashvars[dualScreen.plugin]=true&amp;flashvars[Kaltura.addCrossoriginToIframe]=true&amp;&wid=1_auofufhv" width="560" height="630" allowfullscreen webkitallowfullscreen mozAllowFullScreen allow="autoplay *; fullscreen *; encrypted-media *" sandbox="allow-forms allow-same-origin allow-scripts allow-top-navigation allow-pointer-lock allow-popups allow-modals allow-orientation-lock allow-popups-to-escape-sandbox allow-presentation allow-top-navigation-by-user-activation" frameborder="0" title="Kaltura Player"></iframe>
     </center>

.. raw:: html

   <a href="https://courses.cs.vt.edu/~cs2114/meng-bridge/course-notes/7.6.4.1-JavaOOPPolyInteger.pdf" target="_blank">
   <img src="https://courses.cs.vt.edu/~cs2114/meng-bridge/images/projector-screen.png" width="32" height="32">
   Video Slides 7.6.4.1-JavaOOPPolyInteger.pdf</img>
   </a>


Checkpoint 3
------------

.. avembed:: Exercises/SWDesignAndDataStructs/OOP2Checkpoint3Summ.html ka
   :long_name: Checkpoint 3


Programming Practice: Polymorphism 2
------------------------------------

.. extrtoolembed:: 'Programming Practice: Polymorphism 2'
   :workout_id: 1908