Design a Vehicle Class Hierarchy in Java to Demonstrate Polymorphism

Design a Vehicle Class Hierarchy in Java to Demonstrate Polymorphism.

Definition of Polymorphism: Polymorphism is an ability to take more than one form. It is two types, "Compile Time Polymorphism" and "Run Time Polymorphism".

class Vehicle
{
	String regno;
	int model;
	Vehicle(String r, int m)
	{
		regno=r;
		model=m;
	}
	void display()
	{
		System.out.println("Registration no: "+regno);
		System.out.println("Model no: "+model);
	}
}

class Twowheeler extends Vehicle
{
	int noofwheel;
	Twowheeler(String r,int m,int n)
	{
		super(r,m);
		noofwheel=n;
	}
	void display()
	{
		System.out.println("Two wheeler tvs");
		super.display();
		System.out.println("No. of wheel : " +noofwheel);
	}
}

class Threewheeler extends Vehicle
{
	int noofleaf;
	Threewheeler(String r,int m,int n)
	{
		super(r,m);
		noofleaf=n;
	}
	void display()
	{
		System.out.println("Three wheeler auto");
		super.display();
		System.out.println("No. of leaf:" +noofleaf);
	}
}

class Fourwheeler extends Vehicle
{
	int noofleaf;
	Fourwheeler(String r,int m,int n)
	{
		super(r,m);
		noofleaf=n;
	}
	void display()
	{
		System.out.println("Four wheeler car");
		super.display();
		System.out.println("No. of leaf:" +noofleaf);
	}
}

class VehicleDemo
{
	public static void main(String arg[])
	{
		Twowheeler t1;
		Threewheeler th1;
		Fourwheeler f1;
		t1=new Twowheeler("TN74 12345", 1,2);
		th1=new Threewheeler("TN74 54321", 4,3);
		f1=new Fourwheeler("TN34 45677",5,4);
		t1.display();
		th1.display();
		f1.display();
	}
}

 OUTPUT:

Two wheeler tvs
Registration no: TN74 12345
Model no: 1
No. of wheel : 2
Three wheeler auto
Registration no: TN74 54321
Model no: 4
No. of leaf:3
Four wheeler car
Registration no: TN34 45677
Model no: 5
No. of leaf:4