Another Java Constructor Sample

When an object is defined, we can also access methods and fields. Below is another use of constructor and accessing instance variables for use.

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import java.io.*;
public class CircleQuiz {
double radius;
double area, diameter;
CircleQuiz()
{ radius=1;}
public static void main(String args[]) throws IOException{

BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
CircleQuiz x=new CircleQuiz();
String str;
double r;

System.out.println("use of Constructors:");
System.out.println("Default radius from a constructor: "+x.getRadius());

System.out.println("New Input for radius:");
System.out.println("Input radius :");
r=Double.parseDouble(br.readLine());



if (r<=0) r=x.radius; x.setRadius(r); System.out.println("Diameter "+x.computeDiameter(r)); System.out.println("Area"+x.computeArea(r)); } double getRadius() { return radius;} void setRadius(double x) { radius=x;} double computeDiameter(double r ) { double circleDiameter =r * 2; return circleDiameter;} double computeArea(double r ) { double circleArea =3.14 * r * r; return circleArea;} }