Week 5: Class hierarchies/02B. Boat's inheritors

The programme defines the class Boat.

Write three classes that inherit the class Boat:
Sailboat
Rowingboat
Canoe
There is no need to define any properties for the classes, an empty block is sufficient.



import java.util.Random;

public class Test{
    public static void main(String[] args){
        final Random r = new Random();
        
        
        System.out.println("Creating objects...");
                Sailboat sb = new Sailboat();
        Rowingboat rb = new Rowingboat();
        Canoe c = new Canoe();
        
        System.out.println("Objects created!");
        System.out.println("Testing inheritance...");
        
        System.out.println("Sailboat inherits Boat: " + 
                (sb instanceof Boat ? "Ok" : "No"));
        
        System.out.println("Rowing boat inherits Boat: " + 
                (rb instanceof Boat ? "Ok" : "No"));
        
        System.out.println("Canoe inherits Boat: " + 
                (c instanceof Boat ? "Ok" : "No"));
    }
}

class Boat {}


class Sailboat extends Boat {}
class Rowingboat extends Boat {}
class Canoe extends Boat {}






Creating objects...
Objects created!
Testing inheritance...
Sailboat inherits Boat: Ok
Rowing boat inherits Boat: Ok
Canoe inherits Boat: Ok