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Method overriding is different from method overloading . Method overloading will be discussed in the next module.

What's next?

In the next module, I will explain the use of overloaded methods for the purpose of achieving compile-time polymorphism.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: Inheritance, Part 2
  • File: Java1606.htm
  • Published: 01/28/02
Disclaimers:

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

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

In the past, unknown individuals have misappropriated copies of my modules from cnx.org, converted them to Kindle books, andplaced them for sale on Amazon.com showing me as the author. I receive no compensation for those sales and don't know who doesreceive compensation. If you purchase such a book, please be aware that it is a bootleg copy of a module that is freelyavailable on cnx.org.

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

Complete program listing

A complete listing of the program is shown in Listing 5 below.

Listing 5 . The program named Radio03.
Copyright 2002, R.G.Baldwin Simulates the manufacture and use of acombination car radio and tape player. Uses method overriding to avoidmodifying the class named Radio. This program produces the followingoutput on the computer screen:Combo object constructed Play RadioPlaying the station at 93.5 Mhz Insert TapeTape is in Radio is offPlay Radio Remove the tape firstRemove Tape Tape is outRadio is on Play RadioPlaying the station at 93.5 Mhz Play TapeInsert the tape first Insert TapeTape is in Radio is offPlay Tape Tape is playingRemove Tape Tape is outRadio is on Play RadioPlaying the station at 93.5 Mhz **************************************/public class Radio03{ //This class simulates the// manufacturer and the human user public static void main(String[] args){Combo myObjRef = new Combo(); myObjRef.setStationNumber(3,93.5);myObjRef.playStation(3); myObjRef.insertTape();myObjRef.playStation(3); myObjRef.removeTape();myObjRef.playStation(3); myObjRef.playTape();myObjRef.insertTape(); myObjRef.playTape();myObjRef.removeTape(); myObjRef.playStation(3);}//end main }//end class Radio03//===================================// class Radio{//This class simulates the plans from // which the radio object is created.// This code is the same as in the // program named Radio01.protected double[] stationNumber =new double[5];public void setStationNumber(int index,double freq){ stationNumber[index]= freq; }//end method setStationNumber//This version of playStation doesn't// accommodate tape operations. public void playStation(int index){System.out.println( "Playing the station at "+ stationNumber[index] + " Mhz");}//end method playStation}//end class Radio //===================================//class Combo extends Radio{private boolean tapeIn = false; //---------------------------------//public Combo(){//constructorSystem.out.println( "Combo object constructed");}//end constructor //---------------------------------////Overridden playStation method. This// overridden version accommodates // tape operations.public void playStation(int index){ System.out.println("Play Radio");if(!tapeIn){ System.out.println(" Playing the station at " + stationNumber[index]+ " Mhz"); }else{System.out.println( " Remove the tape first");}//end if/else }//end method playStation//---------------------------------//public void insertTape(){ System.out.println("Insert Tape");tapeIn = true; System.out.println(" Tape is in"); System.out.println(" Radio is off"); }//end insertTape method//---------------------------------//public void removeTape(){ System.out.println("Remove Tape");tapeIn = false; System.out.println(" Tape is out"); System.out.println(" Radio is on"); }//end removeTape method//---------------------------------//public void playTape(){ System.out.println("Play Tape");if(!tapeIn){ System.out.println(" Insert the tape first"); }else{System.out.println( " Tape is playing");}//end if/else }//end playTape}//end class combo

-end-

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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