Write an object oriented program which can calculate the area of a circle with a

Question

Write an object oriented program which can calculate the area of a circle with a given radius value.

Description: Your program will have two classes.

Class 1: Circle Class
This class has a field named radius and two methods: (1) setRadius method sets the value of radius and (2) area method calculates and returns the area of the circle corresponding to the radius value.

Class 2: CircleDemo Class
This class has the main method which creates two circle objects:
Soccer Field with radius 100.
Cricket Field with radius 150.
The main function prints the area of Soccer Field and Cricket Field.

Explanation / Answer

//Circle.java that extends the GeometricObject
//The method compareTo that returns the greater of the two
//circle objects
public class Circle
{
  
   //private filed for radius
   private double radius;  
  
   //defualt constrctor
   public Circle()
   {
       radius=0;
   }
  
   //The method setRadius accepts the radius of type double
   public void setRadius(double radius)
   {
       this.radius=radius;
   }

   //The getArea metod returns the area of the circle
   //Forumula area=PI * radius*radius
   public double getArea()
   {
       return Math.PI*radius*radius;
   }
  
   @Override
   public String toString()
   {  
       return "Circle :Radius "+radius;
   }
  

  
}

--------------------------------------------------------

/*The java class that tests the circle class
* with soccer field radius and circket stadium
* radius and print its areas
* */
//CircleDemo.java
public class CircleDemo
{

   public static void main(String[] args)
   {

       //create an instance of Circle class
       //and set the radius using setRadius method
       Circle soccerField=new Circle();
       soccerField.setRadius(150);
      
       System.out.println(soccerField.toString());
       System.out.println("Area : "+soccerField.getArea());
      

       //create an instance of Circle class
       //and set the radius using setRadius method
       Circle cricketField=new Circle();
       cricketField.setRadius(100);
       System.out.println(cricketField.toString());
       System.out.println("Area : "+cricketField.getArea());

   }

}

------------------------

Sample output:

Circle :Radius 150.0
Area : 70685.83470577035
Circle :Radius 100.0
Area : 31415.926535897932

Hope this helps you

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