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Summary

In this module, you learned about :

  • Interface definitions
  • Implementing an interface in a class definition
  • Defining interface methods in a class definition
  • Storing references to new objects in elements of an array of type Object
  • Casting elements to an interface type in order to call interface methods
  • Parameterized constructors
  • Overridden toString method

What's next?

You will learn how to scale images and how to rotate and translate images using the AffineTransform class in the next module.

While not a requirement of the course, you can select the following links to view optional online video lectures on the material in thismodule.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: Interfaces, Object Arrays, etc.
  • File: Java3020.htm
  • Published: 08/02/12
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 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 of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

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 discussed in this module is shown in Listing 13 below.

Listing 13 . Complete program listing.
/*File Prob05 Copyright 2008 R.G.Baldwin *********************************************************/import java.util.*; class Prob05{public static void main(String[] args){Random generator = new Random(new Date().getTime()); int randomData = (byte)generator.nextInt();Object[] var1 = new Object[2]; var1[0]= new Prob05MyClassA(randomData); var1[1]= new Prob05MyClassB(randomData); System.out.print(((Prob05X)var1[0]).getModifiedData() + " ");System.out.print(randomData + " "); System.out.println(((Prob05X)var1[1]).getModifiedData());System.out.print(((Prob05X)var1[0]).getData() + " ");System.out.print(randomData + " "); System.out.println(((Prob05X)var1[1]).getData()); System.out.print(((Prob05X)var1[0]) + " "); System.out.print(randomData + 5 + " ");System.out.println(((Prob05X)var1[1]));}//end main }//end class Prob05//======================================================// interface Prob05X{public int getModifiedData(); public int getData();}//end interface //======================================================//class Prob05MyClassA implements Prob05X{ private int data;Prob05MyClassA(int inData){ System.out.println("Prob05");System.out.println("Put your first name here"); data = inData;}//end constructor //----------------------------------------------------//public int getModifiedData(){ return data - 1;}//end getModifiedData() //----------------------------------------------------//public int getData(){ return data;}//end getData() //----------------------------------------------------//public String toString(){ return "" + (data + 5);}//end toString() }//end class Prob05MyClassA//======================================================// class Prob05MyClassB implements Prob05X{private int data; Prob05MyClassB(int inData){System.out.println("Put your last name here"); data = inData;}//end constructor public int getModifiedData(){return data + 1; }//end getModifiedData()public int getData(){ return data;}//end getData() public String toString(){return "" + (data + 5); }//end toString()}//end class Prob05MyClassB

-end-

Questions & Answers

calculate molarity of NaOH solution when 25.0ml of NaOH titrated with 27.2ml of 0.2m H2SO4
Gasin Reply
what's Thermochemistry
rhoda Reply
the study of the heat energy which is associated with chemical reactions
Kaddija
How was CH4 and o2 was able to produce (Co2)and (H2o
Edafe Reply
explain please
Victory
First twenty elements with their valences
Martine Reply
what is chemistry
asue Reply
what is atom
asue
what is the best way to define periodic table for jamb
Damilola Reply
what is the change of matter from one state to another
Elijah Reply
what is isolation of organic compounds
IKyernum Reply
what is atomic radius
ThankGod Reply
Read Chapter 6, section 5
Dr
Read Chapter 6, section 5
Kareem
Atomic radius is the radius of the atom and is also called the orbital radius
Kareem
atomic radius is the distance between the nucleus of an atom and its valence shell
Amos
Read Chapter 6, section 5
paulino
Bohr's model of the theory atom
Ayom Reply
is there a question?
Dr
when a gas is compressed why it becomes hot?
ATOMIC
It has no oxygen then
Goldyei
read the chapter on thermochemistry...the sections on "PV" work and the First Law of Thermodynamics should help..
Dr
Which element react with water
Mukthar Reply
Mgo
Ibeh
an increase in the pressure of a gas results in the decrease of its
Valentina Reply
definition of the periodic table
Cosmos Reply
What is the lkenes
Da Reply
what were atoms composed of?
Moses Reply
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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
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