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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
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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.
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The Horse's mouth provides a daily tip or thought.
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