circles 1 Answer(s) 4 years ago
Posted in : Java Beginners
Write Circle class. ? The class has one instance variable for diameter. ? The class has methods o Circle() // sets a default radius 5 o Circle(double radius) // sets radius // into the instance variable o Circle(int radius) o void set(double radius) // sets the radius // into the instance variable o void set(int radius) o double getRadius() // returns the radius // of the circle o double circumference() // returns the circumference // of the circle o double area() // returns the area // of the circle
Write an application that uses Circle class. ? The program creates a Circle object with the default constructor, and prints the object by using the methods in the object. ? The program reads a radius from the user, creates a Circle object with the radius, and prints the object by using the methods in the object. ? The program creates a Circle object with the default constructor, sets a distance, and prints the object by using the methods in the object.
Radius = 34.0 Circumference = 213.628324 Area = 3631.6815079999997
Radius = 10.0 Circumference = 62.83186 Area = 314.1593
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August 12, 2010 at 5:58 PM
Hi Friend,
Try the following code:
class Circle{ int r; double radius; double pi=3.14; Circle(){ radius=5; } Circle(double radius){ this.radius=radius; } Circle(int r){ this.r=r; } public void setRadius(double radius){ this.radius=radius; }
public void setR(int r){ this.r=r; } public double getRadius(){ return radius; } public double circumference(){ double cf=2*pi*radius; return cf; }
public double area(){ double a=pi*radius*radius; return a; } } public class CircleApplication { public static void main(String[] args) { Circle c1=new Circle(); System.out.println(c1.radius); System.out.println(c1.circumference()); System.out.println(c1.area());
Circle c2=new Circle(34.0); System.out.println(c2.radius); System.out.println(c2.circumference()); System.out.println(c2.area());
Circle c3=new Circle(10.0); c3.setRadius(10.0); System.out.println(c3.getRadius()); System.out.println(c3.circumference()); System.out.println(c3.area());
} }
Thanks
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