Excersise : 4 Abstract Class | Java | Tamizhan Goals

Excersise : 4

    Create a program with abstract class

Program

import java.io.*;
import java.lang.*;
abstract class Figure
	{
		double dim1;
		double dim2;
	Figure(double A,double B)
	{
		dim1=A;
		dim2=B;
	}
	abstract double area();
	}
class Rectangle extends Figure
	{
	Rectangle(double x,double y)
		{
			super(x,y);
		}
	double area()
		{
			System.out.println("inside area for rectangle");
			return dim1*dim2;
		}
	}
class Triangle extends Figure
	{
	Triangle(double x1,double y1)
		{
			super(x1,y1);
		}
	double area()
		{
			System.out.println("inside area for triangle");
			return dim1*dim2/2;
		}
	}
class Abstractareas
	{
	public static void main(String arg[])throws IOException
		{
			Figure figref;
			Rectangle r;
			Triangle t;
			DataInputStream din=new DataInputStream(System.in);
			double x,y;
			System.out.println("Enter the value of x:");
			x=Double.parseDouble(din.readLine());
			System.out. println("Enter the value of y:");
			y=Double.parseDouble(din.readLine());
			r=new Rectangle(x,y);
			figref=r;
			System.out.println("Area is"+figref.area());
			double x1,y1;
			System.out.println("Enter the value of x1:");
			x1=Double.parseDouble(din.readLine());
			System.out. println("Enter the value of y1:");
			y1=Double.parseDouble(din.readLine());
			t=new Triangle(x1,y1);
			figref=t;
			System.out.println("Area is"+figref.area());
		}
	}

Output