<< Chapter < Page Chapter >> Page >

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-

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