In Java

Alter the circle class provided here to include a compareTo method. With this class we will compare circle objects according to their radius. DO NOT change the toString method (or your output will be wrong). Input is from the keyboard and consists first of an integer to tell you how many doubles will follow. Each double is the radius of a circle. Add code to the main method as specified.

import java.util.ArrayList; import java.util.Collections; import java.util.Scanner;

public class Lab7Num1

{ public static void main(String[] args) { Scanner keyboard = new Scanner(System.in); ArrayListmyC = new ArrayList(); //input the number of circles int howMany = keyboard.nextInt(); //loop howMany times, //each time input a double, create a circle, add it to the ArrayList //sort the ArrayList //output the ArrayList } }

public class Circle implements Comparable { //attribute private double radius; //constructors public Circle() {radius=0.0; } public Circle(double r) {radius=r; } //accessors public double getRadius() { return radius; } //mutators public void setRadius(double r) { radius = r; } //methods public double circumference() { return 2*Math.PI*radius; } public double area() { return Math.PI*radius* radius; } public String toString() { return "Circle of radius " + radius; } public int compareTo(Circle c) { //write your code here } }