Java program that illustrates how runtime polymorphism is achieved

In this article we will learn to implement a Java program that illustrates how runtime polymorphism is achieved. A Java program is provided below that demonstrates how runtime polymorphism is achieved.

abstract class Figure
{
	int dim1, dim2;
	Figure(int x, int y)
	{
		dim1 = x;
		dim2 = y;
	}
	abstract void area();
}
class Triangle extends Figure
{
	Triangle(int x, int y)
	{
		super(x,y);
	}
	void area()
	{
		System.out.println("Area of triangle is: "+(dim1*dim2)/2);
	}
}
class Rectangle extends Figure
{
	Rectangle(int x, int y)
	{
		super(x,y);
	}
	void area()
	{
		System.out.println("Area of rectangle is: "+(dim1*dim2));
	}
}
class RuntimePoly
{
	public static void main(String args[])
	{
		Figure f;
		Triangle t = new Triangle(20,30);
		Rectangle r = new Rectangle(20,30);
		f = t;
		f.area();
		f = r;
		f.area();
	}
}

Output for the above program is as follows:

Area of triangle is: 300
Area of rectangle is: 600

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.