Program to demonstrate Abstract class and Abstract method

 Program to demonstrate Abstract class and Abstract method


abstract class Shape
{

    protected double bs,ht,area;
    void getdata(double b, double h)
    {
    bs=b;
    ht=h;
    }
    abstract void displayarea();

}


class Triangle extends Shape
{

    void displayarea()
    {
        area=0.5*bs*ht;
        System.out.println("Area of triangle is : "+area);
    }
}


class Rectangle extends Shape
{

    void displayarea()
    {
         area=bs*ht;
         System.out.println("Area of rect is : "+area);
    }
}


class Area
{

public static void main(String main[])
{
Triangle t = new Triangle();
Rectangle r =new Rectangle();
t.getdata(3.5,7.5);
t.displayarea();
r.getdata(4,4);
r.displayarea();
}
}

/*
Area of triangle is : 13.125
Area of rect is : 16.0
*/