Answer to Question #314735 in Java | JSP | JSF for shahriar

Question

We have to calculate the area of a rectangle, a square and a circle. Create an abstract class 'Shape' with three abstract methods namely 'RectangleArea' taking two parameters, 'SquareArea' and 'CircleArea' taking one parameter each. The parameters of 'RectangleArea' are its length and breadth, that of 'SquareArea' is its side and that of 'CircleArea' is its radius. Now create another class 'Area' containing all the three methods 'RectangleArea', 'SquareArea' and 'CircleArea' for printing the area of rectangle, square and circle respectively. Create an object of class 'Area' and call all the three methods.

Answer 1

//---------- Shape.java ---------- Abstract class
public abstract class Shape {
    public abstract void RectangleArea(double lenght, double width);
    public abstract void SquareArea(double side);
    public abstract void CircleArea(double radius);
}

//---------- Area.java ----------
import static java.lang.Math.*;

public class Area extends Shape{

    @Override
    public void RectangleArea(double lenght, double width) {
        System.out.printf("Rectangle area = %.2f", lenght*width);
        System.out.println("");
    }

    @Override
    public void SquareArea(double side) {
        System.out.printf("Square area = %.2f", pow(side,2));
        System.out.println("");
    }

    @Override
    public void CircleArea(double radius) {
        System.out.printf("Circle area = %.2f", PI*pow(radius, 2));
        System.out.println("");
    }
}

//---------- Main.java ----------
import java.util.Scanner;

public class Main{
    public static void main(String[] args) {

        Area area = new Area();
        Scanner in = new Scanner(System.in);

        System.out.print("Entrer length for rectangle: ");
        double len = in.nextDouble();
        System.out.print("Entrer breadth for rectangle: ");
        double bre = in.nextDouble();
        area.RectangleArea(len, bre);

        System.out.print("Entrer breadth for square: ");
        double sid = in.nextDouble();
        area.SquareArea(sid);

        System.out.print("Entrer breadth for circle: ");
        double rad = in.nextDouble();
        area.CircleArea(rad);
    }
}