Could someone help me with this please! Create a class named Circle with field n
ID: 3767888 • Letter: C
Question
Could someone help me with this please!
Create a class named Circle with field names radius, diameter, and area. Include a constructor that sets the radius to 1 and calculates the other two values. Include methods named setRadius() andgetRadius(). The setRadius() method not only sets the radius, but calculates the other two values (as you know, the diameter of a circle is twice the radius, the area of a circle is pi multiplied by the square of the radius). Save class as Circle.java.
Create a class named TestCircle whose main method() declares several Circle objects. UsingsetRadius() method, assign one circle a small radius value (code a user input making use of Scanner ofJOptionPane), and assign another a larger radius value (to be an input by a user as well). Do not assign a value to the radius of the third circle; instead retain the value assigned at object construction. Display all the values for three Circle objects. Save the class as TestCircle.java.
Explanation / Answer
import javax.swing.JOptionPane;
class Circle{
public double area,radius,diameter;
Circle()
{
radius=1;
diameter=2*radius;
area=Math.PI*radius*radius;
}
Circle(double radius){
this.radius=radius;
diameter=2*radius;
area=Math.PI*radius*radius;
}
public double getRadius(){
return radius;
}
public void setRadius(double r){
radius=r;
diameter=2*r;
area=Math.PI*r*r;
}
}
public class TestCircle
{
public static void main(String[] args)
{
double number;
String s;
s=JOptionPane.showInputDialog("enter small radius value");
number=Double.parseDouble(s);
Circle c1=new Circle(number);
s=JOptionPane.showInputDialog("enter a larger radius value");
number=Double.parseDouble(s);
Circle c2=new Circle(number);
Circle c3=new Circle();// it takes default radius value provided in default
constructor
System.out.println("Circle 1 radius="+c1.getRadius()+" Circle 1
Area="+c1.area+" Circle1 Diameter="+c1.diameter);
System.out.println("Circle 2 radius="+c2.getRadius()+" Circle 2
Area="+c2.area+" Circle2 Diameter="+c2.diameter);
System.out.println("Circle 3 radius="+c3.getRadius()+" Circle 3
Area="+c3.area+" Circle3 Diameter="+c3.diameter);
}
}
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