java classes and Inheritance

Here is a simple case of making a class and extending it (inheriting from it.) First We create a simple boat class.

Boat.java

public class Boat {

//private class fields
private int boatSize;
private double cost;

//public gets and sets (accessors and mutators)
//for the fields
public int getBoatSize()
{
return boatSize;
}
public void setBoatSize(int size)
{
boatSize=size;
}

public double getCost()
{
return cost;

}
public void setCost(double price)
{
cost=price;
}

//a simple public method
public double CostPerFoot()
{
return cost/boatSize;
}
}

Here is the class the extends, inherits from Boat. It gets
all the public methods of the parent

MotorBoat.java

public class MotorBoat extends Boat
{
double horsepower;

public double GetHorsePower()
{
return horsepower;
}
public void SetHorsePower(double hp)
{
horsepower=hp;
}
}

Here is the program class that has the main method
and which uses the motorboat class

Program.java

public class Program {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

MotorBoat myBoat=new MotorBoat();
myBoat.setBoatSize(30);
myBoat.setCost(25000);
myBoat.SetHorsePower(20);
double cpf=myBoat.CostPerFoot();

System.out.println("the boat is " + myBoat.getBoatSize()+ " feet long");
System.out.println("the boat costs " + myBoat.getCost() + " dollars");
System.out.println("the horse power is " + myBoat.horsepower );
System.out.println("the cost per foot is" + cpf);

}

}

Here is the output from the program:

the boat is 30 feet long
the boat costs 25000.0 dollars
the horse power is 20.0
the cost per foot is 833.3333333333334

These classes are still very simple. They don't have constructors
or overridable methods. I will do that next.