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Interitance bundle + array, abstract, super, overload
Extending Classes and More example from a Well House Consultants training course
More on Extending Classes and More [link]

This example is described in the following article(s):
   • Java Inheritance example - group of classes - step by step - [link]

Source code: Interit2.java Module: J710

Interitance bundle + array, abstract, super, overload
::::::::::::::
Bus.java
::::::::::::::
/* Class to implement

        Bus Herbert = new Bus("Morriston","Mumbles","08:15",53,61);
        seats = Herbert.getCapacity();
        Destiny = Herbert.getDestination();
*/


public class Bus extends Transport {
        public Bus(String Destiny, String Source, String When,
                        int duration, int seatsPerCarriage){
                super(Destiny,Source,When,duration);
                seats = seatsPerCarriage;
                }

        public int getCapacity() {
                return this.getCapacity(true);
                }
        public int getCapacity(boolean standing) {
                if (standing) {
                        return seats + 6;
                } else {
                        return seats;
                }
        }
}

::::::::::::::
Train.java
::::::::::::::
/* Class to implement

        Train London = new Train("Swansea","Paddington","04:30",180,8,60);
        int seats = London.getCapacity();
        String Destiny = London.getDestination();

*/


public class Train extends Transport {
        public int carriages;
        public Train(String Destiny, String Source, String When,
                        int duration, int carriages, int seatsPerCarriage){
                super(Destiny,Source,When,duration);
                seats = seatsPerCarriage;
                this.carriages = carriages;
                }

        public int getCapacity() {
                return this.getCapacity(true);
                }

        public int getCapacity(boolean standing) {
                if (standing) {
                        return (int)(seats * carriages * 1.4);
                } else {
                        return (int)(seats * carriages);
                }
        }
}

::::::::::::::
Transport.java
::::::::::::::
abstract public class Transport {

        public String Destination;
        public String Source;
        public String Time;
        public int journeylength;
        public int seats;

        abstract int getCapacity();
        abstract int getCapacity(boolean standingAllowed);

        public String getDestination () {
                return "To " + Destination;
                }

        public Transport (String Source, String Destiny, String When,
                        int duration) {
                Destination = Destiny;
                this.Source = Source;
                Time = When;
                journeylength = duration;
        }
}

::::::::::::::
TranTestTwo.java
::::::::::::::
public class TranTestTwo {

public static void main (String [] args) {

        Transport [] options = new Transport[4];
        options[0] = new Train("Swansea","Paddington","04:30",180,8,60);
        options[1] = new Bus("Morriston","Mumbles","08:15",53,61);
        options[2] = new Train("Swansea","Shrewsbury","06:30",300,2,75);
        options[3] = new Bus("Llansamlet","Neath","09:45",42,21);

        for (int k=0; k<options.length; k++) {
                int seats = options[k].getCapacity(false);
                int people = options[k].getCapacity();
                String Destiny = options[k].getDestination();
                System.out.println(Destiny + " " + seats + " " + people);
                }
        }
}
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 "Extending Classes and More" training module. You'll find a description of the topic and some other closely related examples on the "Extending Classes and More" module index page.

Full description of the source code
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Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
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