Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Calling a class - using import to save repeated package names
Packages example from a Well House Consultants training course
More on Packages [link]

This example is described in the following article(s):
   • Relationships between Java classes - inheritance, packaging and others - [link]

Source code: Hilda.java Module: J708
import gowdie.*; // Save need for lots of "gowdie. " stuff!
                // Really means "add to path"

                // Packages equate to directories
                // classes equate to files
                // You can put the whole lot into a jar!

/*

"Too many cooks spoil the broth"
"Too many imports cause confusion and conflict"

Use imports with care - where you have a lot of references to things
in the package being imported. If I see more that 10 imports at the
top of a file I get seriously worried

java.lang is silently and automatically imported every time

*/


public class Hilda {

        public static void main (String [] args) {

                Isobel [] Pets = new Isobel[4];
                Pets[0] = new Isobel("Gypsy",4,7);
                Pets[1] = new Isobel("Charlie",12);
                Pets[2] = new Isobel("Billy",5,8);
                Pets[3] = new Isobel(4,8);

                for (int p=0; p<Pets.length; p++) {
                        Isobel Halliwell;
                        Halliwell = Pets[p];
                        float ca = Halliwell.getEffAge();
                        String nayme = Halliwell.name;
                        System.out.println(nayme+ " is "+ca);
                }

                int mouths = Isobel.getCount();
                System.out.println("You have " + mouths + " animals");

        }

}

/*

Compiler scheme - compile from the top level - PLEASE - some compilers do
very peculiar things if you cd in. Here's the right way:

wizard:java graham$ javac gowdie/Isobel.java
wizard:java graham$ javac Hilda.java
wizard:java graham$ javac Hattie.java
wizard:java graham$ java Hilda
Gypsy is 28.0
Charlie is 72.0
Billy is 40.0
- is 32.0
You have 4 animals
wizard:java graham$ Java Hattie
Gypsy is 28.0
Charlie is 72.0
Dunno is 40.0
- is 32.0
You have 4 animals
wizard:java graham$

((Largely fixed these days - used to cause hours of headscratching!))

*/


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to Program in Java
 * Java Bootcamp
 * Java Programming for the Web
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Java and associated technologies are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Packages" training module. You'll find a description of the topic and some other closely related examples on the "Packages" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

Web site author
This web site is written and maintained by Well House Consultants.

Conditions of use
Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details.

Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2022: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/resources/ex.php • PAGE BUILT: Sun Oct 11 14:50:09 2020 • BUILD SYSTEM: JelliaJamb