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Class and calling code - all in same file
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: Geraldine.java Module: J708
/* Demonstration of how class funadementals are 'done' in Java ... with some of the
slightly more advanced stuff thrown in too.

We've defined an object type "Geraldine" (we were going through the alphabet on the
course, using ladies names!) which holds information about a pet animal. We then
set up an array that could hold four Geraldines, and called the constructor four time -
actually with a different number and type of paramaters to show how many methods in Java
can be defined with the same name in the same class, provided that they have a different
number and / or type of parameters.

Having set up our objects, we loop through them one at a time calling various methods to
get the class to perform calculation and return us results. We've also shown you how
to use a variable within an object directly, though you should be very careful about
doing this as it closes the door on you updating the code so that it no longer just
returns the value (if you need to add a calculation, for example!) */

public class Geraldine {

        float age;
        float factor;
        String name;
        static int nanimals = 0;

        Geraldine (int age, int factor) { mkpet("-",age,factor); }
        Geraldine (String name, int age, int factor) { mkpet(name, age, factor); }
        Geraldine (String name, int age) { mkpet(name, age, 6); }

        private void mkpet(String name, int age, int factor) {
                this.name = name;
                this.age = age;
                this.factor = factor;

        float getEffAge() {
                return age * factor;

        static int getCount() {
                return nanimals;

        public static void main (String [] args) {

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

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

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




wizard:java graham$ java Geraldine
Gypsy is 28.0
Charlie is 72.0
Dunno is 40.0
- is 32.0
You have 4 animals
wizard:java graham$


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
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