Answer to Question #342600 in Java | JSP | JSF for Kirti

Question

Create an abstract class Shape and the derived classes Square, Triangle and Circle. Write a

java program to display area of different shapes.

Answer 1

public abstract class Shape {

    public abstract double displayArea();
}

public class Circle extends Shape {

    int radius;

    public Circle(int radius) {
        this.radius = radius;
    }

    @Override
    public double displayArea() {
        return Math.PI * Math.pow(radius, 2);
    }
}

public class Square extends Shape{

    int side;

    public Square(int side) {
        this.side = side;
    }

    @Override
    public double displayArea() {
        return Math.pow(side, 2);
    }
}

public class Triangle extends Shape{

    int a;
    int b;
    int c;

    public Triangle(int a, int b, int c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    @Override
    public double displayArea() {
        double sp = (a + b + c) / 2.0; // Semiperimeter
        return Math.sqrt(sp * (sp - a) * (sp - b) * (sp - c)); // Heron's formula
    }
}