Question

Language: Java

Question:Using your Circle class (or the one provided below), create a Circle array of size 4 in a driver class using the following statement: Circle circleArr[] = new Circle[4]; Populate the array with four different radiuses and then, using a for loop from 0 to one less then the length of the array, print the area and the diameter of each of the four circles

Circle Class:

import java.text.DecimalFormat;

public class Circle {
   DecimalFormat dec = new DecimalFormat("#.##");
   private int radius;
  
   public Circle(int radius) {
       this.radius = radius;
   }

   public void setRadius(int r) {
       radius = r;
   }
  
   public int getRadius() {
       return radius;
   }
  
   public int getDiameter() {
       return radius*radius;
   }
  
   public double getArea() {
       return Math.PI*radius*radius;
   }
  
   public String toString() {
       String result = "A circle with radius " + getRadius() + " has an area of " + dec.format(getArea()) + " and a diameter of " + getDiameter();
       return result;
   }
}

Answer 1

import java.text.DecimalFormat;

public class Circle {
    DecimalFormat dec = new DecimalFormat("#.##");
    private int radius;

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

    public void setRadius(int r) {
        radius = r;
    }

    public int getRadius() {
        return radius;
    }

    public int getDiameter() {
        return radius * radius;
    }

    public double getArea() {
        return Math.PI * radius * radius;
    }

    public String toString() {
        String result = "A circle with radius " + getRadius() + " has an area of " + dec.format(getArea()) + " and a diameter of " + getDiameter();
        return result;
    }
}

class CircleTest {

    public static void main(String[] args) {
        Circle circleArr[] = new Circle[4];
        circleArr[0] = new Circle(5);
        circleArr[1] = new Circle(1);
        circleArr[2] = new Circle(10);
        circleArr[3] = new Circle(7);

        for (int i = 0; i < circleArr.length; i++) {
            System.out.println(circleArr[i]);
        }
    }
}