<< Chapter < Page Chapter >> Page >

Answer and Explanation

Listings

I recommend that you open another copy of this document in a separate browser window and use the following links to easilyfind and view the listings while you are reading about them.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Ap0070: Self-assessment, Method Overloading
  • File: Ap0070.htm
  • Originally published: 2002
  • Published at cnx.org: 12/04/12
  • Revised: 12/03/14
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

Answers

Answer 8

C. SubC SuperC

Explanation 8

While admittedly a little convoluted, this is another relatively straightforward application of method overloading using types from the classhierarchy.

Type SubC , SuperC , or Object?

This method defines a class named SuperC , which extends Object , and a class named SubC , which extends SuperC . Therefore, an object instantiated from the class named SubC can be treated as any of the following types: SubC , SuperC , or Object .

Two overloaded methods in different classes

Two overloaded methods named overLoadMthd are defined in two classes in the inheritance hierarchy. The class named SuperC defines a version that requires an incoming parameter of type SuperC . The class named SubC defines a version that requires an incoming parameter of type SubC . When called, each of these overloaded methods prints the type of its formal argument.

Two objects of type SubC

The program instantiates two objects of the SubC class, storing the reference to one of them in a reference variable of type SubC , and storing the reference to the other in a reference variable of type SuperC .

Call the overloaded method twice

The next step is to call the overloaded method named overLoadMthd twice in succession, passing each of the reference variables of type SubC and SuperC to the method.

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?

Ask