The following assignment relates to arrays and (naturally) objects. Using the at

Question

The following assignment relates to arrays and (naturally) objects. Using the attached Circle class as a reference (feel free to use this class!), pleae write an application that performs the following:

Step 1: create a Circle array that holds 1000 Circle objects

Step 2: using a for loop, initialize the Circle array - create 1000 Circle objects and store each Circle object in the array. (Hint : use the index of the array as the argument for the Circle constructor)

Step 3. Create a method that accepts A Circle array (see step 2) , and returns the sum of all Circle objects in the array.

Step 4. Create a method that accepts a Circle array (see step 2) and returns the average area of all Circle objects in the array.

Step 5. Call the methods in steps 3 and 4 to display the values returned by those methods.

Explanation / Answer

class Circle{
   private double radius;
  
   public Circle(double radius) {
       this.setRadius(radius);
   }

   public double getRadius() {
       return radius;
   }

   public void setRadius(double radius) {
       this.radius = radius;
   }
   public double area(){
       return (22.0/7.0)*radius*radius;
   }
}

public class CircleArrayDemo {

   public static void main(String[] args) {
       Circle circles[] = new Circle[1000];
       for(int i=0; i<circles.length; i++){
           circles[i] = new Circle(i);
       }
       System.out.println("Sum ="+getSum(circles));
       System.out.println("Average ="+getAverage(circles));
   }
  
   public static long getSum(Circle[] circles){
       long sum=0;
       for(int i=0; i<circles.length; i++){
           sum += circles[i].area();
       }
       return sum;
   }
   public static double getAverage(Circle[] circles){
       double sum=0.0;
       for(int i=0; i<circles.length; i++){
           sum += circles[i].area();
       }
       return sum/(double)circles.length;
   }
}

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