Mega Code Archive
0151 Using abstract methods and classes
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abstract class Shape {
double height;
double width;
Shape(double a, double b) {
height = a;
width = b;
}
abstract double area();
}
class Rectangle extends Shape{
Rectangle(double a, double b) {
super(a, b);
}
double area() {
System.out.println("Inside Area for Rectangle.");
return height * width;
}
}
class Triangle extends Shape{
Triangle(double a, double b) {
super(a, b);
}
double area() {
System.out.println("Inside Area for Triangle.");
return height * width / 2;
}
}
public class Main {
public static void main(String args[]) {
Rectangle r = new Rectangle(10, 5);
Triangle t = new Triangle(10, 8);
Shape figref;
figref = r;
System.out.println("Area is " + figref.area());
figref = t;
System.out.println("Area is " + figref.area());
}
}
The output:
Inside Area for Rectangle.
Area is 50.0
Inside Area for Triangle.
Area is 40.0
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